Air conditioner fault detection method, air conditioner, control device and storage medium

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioner fault detection method, an air conditioner, a control device and a storage medium, and aims to solve the problem of fault detection of a stop valve in the air conditioner. In order to achieve the purpose, the method comprises the steps that whether the coil pipe temperature of an indoor unit evaporator and the coil pipe temperature of an outdoor unit condenser detected in a first preset operation state and the coil pipe temperature of the indoor unit evaporator and the coil pipe temperature of the outdoor unit condenser detected in a second preset operation state meet preset conditions or not is judged; by the adoption of the method, the risk that the compressor of the air conditioner is damaged can be effectively reduced, and the use reliability of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner fault detection method, an air conditioner, a control device and a storage medium. Background Art

[0002] The split air conditioner consists of an indoor unit and an outdoor unit, which are connected as a whole during installation. In order to facilitate installation and maintenance, a stop valve is installed in the outdoor unit of the air conditioner to control the opening of the refrigerant circulation. On the one hand, during the installation process, if the air conditioner is turned on and operated without opening the stop valve in the outdoor unit after installation, it is easy to damage the compressor in a short time, or even cause pipeline explosion. On the other hand, during the use of the air conditioner, if the amount of refrigerant in the air conditioner is reduced to a certain extent, running the air conditioner is easy to cause the compressor to wear and even get stuck. It can be seen that it is particularly important to detect the lack of refrigerant and the failure of the stop valve to open, which are easy to cause air conditioner failures.

[0003] Therefore, how to detect air conditioner failures in time through program detection after installation and maintenance has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the air conditioner fault detection method, air conditioner, control device and storage medium proposed in the present invention are helpful to solve or at least partially solve the technical problem of air conditioner fault caused by the stop valve not being opened.

[0005] In a first aspect, the present invention provides a method for detecting a fault in an air conditioner, the method comprising:

[0006] The air conditioner is powered on and starts running, and enters the fault detection mode;

[0007] In a first preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain a first detection temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain a second detection temperature;

[0008] In the second preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain a third detection temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain a fourth detection temperature;

[0009] Determining whether the first detected temperature, the second detected temperature, the third detected temperature, and the fourth detected temperature meet a preset condition;

[0010] When the preset condition is met, a fault detection result of the air conditioner is determined according to the satisfied preset condition.

[0011] The above-mentioned preset conditions include a first preset condition, wherein the first preset condition means that the difference between the first detection temperature and the third detection temperature is less than a first preset value and the difference between the second detection temperature and the fourth detection temperature is greater than or equal to a second preset value;

[0012] If the first preset condition is met, the fault detection result of the air conditioner is determined to be a stop valve fault.

[0013] The above-mentioned preset condition includes a second preset condition; the second preset condition means that the difference between the first detection temperature and the third detection temperature is less than the first preset value and the difference between the second detection temperature and the fourth detection temperature is less than the second preset value;

[0014] If the second preset condition is met, the fault detection result of the air conditioner is determined to be a refrigerant shortage fault.

[0015] Preferably, the above-mentioned first preset operating state refers to an operating state in which the air conditioner is turned on to enter cooling, dehumidification, heating or automatic mode, and the running time of the internal fan after starting does not exceed the first preset time value; the second operating state refers to an operating state in which the air conditioner is turned on to enter cooling, dehumidification, heating or automatic mode, and the running time of the compressor after starting does not exceed the second preset time value.

[0016] Furthermore, the preset condition further includes a third preset condition; the third preset condition means that the difference between the first detected temperature and the third detected temperature is greater than or equal to a first preset value;

[0017] If the third preset condition is met, the return air outlet temperature of the indoor unit is detected and recorded as the fifth detected temperature, and the current detection mode is exited when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to the third preset value.

[0018] Furthermore, the method further includes: when the difference between the third detection temperature and the fifth detection temperature is greater than or equal to a third preset value, timing the operation time of the compressor, and permanently terminating the detection of the stop valve fault when the accumulated timing exceeds the third preset time value.

[0019] Preferably, when the stop valve failure is determined, the method further includes: controlling the compressor to stop running, and / or prompting the user with the failure detection result.

[0020] In a second aspect, the present invention provides an air conditioner, comprising an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor heat exchanger and an indoor fan, and the outdoor unit comprises an outdoor heat exchanger, a compressor, a stop valve, and also comprises an indoor unit coil temperature sensor, an outdoor unit coil temperature sensor and a controller; the controller is configured to execute the method described in any one of the technical solutions of the above-mentioned air conditioner fault detection method.

[0021] In a third aspect, the present invention provides a control device comprising a processor and a storage device, wherein the storage device is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the method described in any one of the technical solutions of the above-mentioned air conditioner fault detection method.

[0022] In a fourth aspect, the present invention provides a computer-readable storage medium storing a plurality of program codes, wherein the program codes are suitable for being loaded and run by a processor to execute the method described in any one of the technical solutions of the above-mentioned air conditioner fault detection method.

[0023] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0024] In the technical scheme for implementing the present invention, the indoor evaporator coil temperature and the outdoor condenser coil temperature detected in the first preset operating state, and the indoor evaporator coil temperature and the outdoor condenser coil temperature detected in the second preset operating state are detected to see whether they meet the preset conditions, thereby determining the air conditioner fault detection result, and further determining whether the fault detection result is a stop valve failure or a refrigerant shortage failure based on the different preset conditions met. This scheme combines the temperatures of the indoor evaporator coil and the outdoor condenser coil for detection, which can improve the accuracy of fault identification of the air conditioner refrigerant circulation system, reduce the risk of damage to the compressor due to forgetting to open the stop valve, and improve the reliability of machine use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0026] Figure 1 is a flow chart of an air conditioner fault detection method according to an embodiment of the present invention;

[0027] Figure 2 is a schematic flow chart of main steps of an air conditioner fault detection method according to another embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the main structure block diagram of an air conditioner according to an embodiment of the present invention.

[0029] Reference numerals list :

[0030] 300: indoor unit, 301: indoor heat exchanger, 302: indoor unit coil temperature sensor, 303: indoor fan, 304: return air outlet temperature sensor, 400: outdoor unit, 401: outdoor heat exchanger, 402: outdoor unit coil temperature sensor, 403: compressor, 404: stop valve, 500: controller. DETAILED DESCRIPTION

[0031] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0032] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program codes, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0033] Example 1

[0034] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart showing the main steps of a method for detecting air conditioner faults according to an embodiment of the present invention. Figure 1 As shown, the air conditioner fault detection method in the embodiment of the present invention mainly includes the following steps S101 to S107.

[0035] Step S101: the air conditioner is powered on and starts running, and enters a detection mode;

[0036] In this embodiment, before entering the detection mode, it also includes entering the working mode according to the user operation, and the working mode can be any working mode of the cooling mode, the dehumidification mode, the heating mode, and the automatic mode.

[0037] Step S102: In a first preset operating state, detecting the temperature of the evaporator coil of the indoor unit to obtain a first detection temperature, and detecting the temperature of the condenser coil of the outdoor unit to obtain a second detection temperature;

[0038] In this embodiment, the first preset operating state refers to an operating state in which the air conditioner is turned on to enter cooling, dehumidification, heating or automatic mode and the operating time of the internal fan after starting does not exceed the first preset time value; preferably, the first preset time value is 1 minute.

[0039] Step S103: In the second preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain a third detected temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain a fourth detected temperature;

[0040] In this embodiment, the second operating state refers to an operating state in which the air conditioner is turned on and enters cooling, dehumidification, heating or automatic mode, and the operating time of the compressor after starting does not exceed a second preset time value. Preferably, the second preset time value is 4 minutes.

[0041] Step S104: determining whether the first detection temperature, the second detection temperature, the third detection temperature and the fourth detection temperature meet a preset condition;

[0042] In one embodiment, the preset conditions include at least a first preset condition, and the first preset condition means that the difference between the first detection temperature and the third detection temperature is less than a first preset value and the difference between the second detection temperature and the fourth detection temperature is greater than or equal to a second preset value.

[0043] In one embodiment, the preset condition includes at least one of a first preset condition and a second preset condition; the first preset condition means that the difference between the first detection temperature and the third detection temperature is less than a first preset value and the difference between the second detection temperature and the fourth detection temperature is greater than or equal to a second preset value; the second preset condition means that the difference between the first detection temperature and the third detection temperature is less than the first preset value and the difference between the second detection temperature and the fourth detection temperature is less than the second preset value.

[0044] In one embodiment, the preset conditions include at least one of a first preset condition, a second preset condition and a third preset condition; the first preset condition means that the difference between the first detection temperature and the third detection temperature is less than a first preset value and the difference between the second detection temperature and the fourth detection temperature is greater than or equal to a second preset value; the second preset condition means that the difference between the first detection temperature and the third detection temperature is less than the first preset value and the difference between the second detection temperature and the fourth detection temperature is less than the second preset value; the third preset condition means that the difference between the first detection temperature and the third detection temperature is greater than or equal to the first preset value.

[0045] In this embodiment, the first preset value and the second preset value can be determined according to an empirical value or according to an error of a temperature sensor used for temperature detection. Preferably, the first preset value and the second preset value are both set to 2.

[0046] If the first preset condition is met, step S105 is executed; if the second preset condition is met, step S106 is executed; if the third preset condition is met, step S107 is executed.

[0047] Step S105: Determine the fault detection result as a stop valve fault.

[0048] In this embodiment, the stop valve failure specifically refers to the stop valve not being opened.

[0049] Step S106: Determine the fault detection result as a refrigerant shortage fault.

[0050] Step S107: Detect the temperature of the return air outlet of the indoor unit and record it as the fifth detected temperature, and exit the current detection mode when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to a third preset value.

[0051] In this embodiment, the third preset value can be determined according to an empirical value or according to an error of a temperature sensor used for temperature detection. Preferably, the third preset value is set to 5.

[0052] Furthermore, in this step, when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to a third preset value, the step further includes:

[0053] The running time of the compressor is timed, and when the accumulated time exceeds a third preset time value, the detection of the stop valve fault is permanently terminated.

[0054] In this embodiment, whenever the difference between the third detected temperature and the fifth detected temperature is greater than or equal to the third preset value, the timing of the compressor is started. When the difference between the third detected temperature and the fifth detected temperature does not meet the condition of being greater than or equal to the third preset value during the timing process, the timing is simply stopped without being reset to zero. The accumulation continues when the condition is met next time, until the accumulated timing exceeds the third preset time value, and the detection of the stop valve fault is permanently terminated. Preferably, the third preset time value is 20 hours.

[0055] In this embodiment, timing the operation time of the compressor and permanently ending the detection of the stop valve failure when the accumulated timing exceeds the third preset time value specifically includes:

[0056] timing the running time of the compressor after the air conditioner is started in the cooling, dehumidification or automatic mode, and recording the accumulated running time as a first time value;

[0057] timing the running time of the compressor after the air conditioner is started in the heating or automatic mode, and recording the accumulated running time as the second time value;

[0058] When the sum of the first time value and the second time value is greater than the third preset time value, the fault detection result is determined as no stop valve fault exists, and the detection of the stop valve fault is permanently terminated.

[0059] In one embodiment, the implementation method of permanently ending the detection of the stop valve failure can be to set a detection flag to determine whether to enter the detection mode to detect the stop valve failure. For example, after the air conditioner is powered on and started in step S101, it is first detected whether the detection flag exists. If yes, the detection mode is entered, otherwise the detection mode cannot be entered. Correspondingly, in step 107, only when the difference between the third detection temperature and the fifth detection temperature is greater than or equal to the third preset value, and the accumulated timing of the compressor operation time reaches the third preset time value, the detection flag is cleared to permanently end the detection of the stop valve failure.

[0060] In this embodiment, when it is determined in the above step S105 that the fault detection result is a stop valve fault, the following operations are further performed: controlling the compressor to stop running, and / or prompting the user with the fault detection result.

[0061] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0062] Example 2

[0063] In a specific application example of the present invention, Figure 2 The present invention provides a method for detecting faults of an air conditioner, which is particularly suitable for detecting protection faults of stop valves in air conditioners. At present, air conditioners on the market determine whether the refrigerant circulation is abnormal by detecting the temperature of the evaporator coil of the indoor unit, and there are too many reasons for abnormal refrigerant circulation. Based on the existing method for detecting abnormal refrigerant circulation of air conditioners, this embodiment detects the temperature of the condenser coil of the outdoor unit to determine whether the abnormal refrigerant circulation is caused by lack of refrigerant or by the stop valve protection.

[0064] The specific working process of the air conditioner fault detection method provided in this embodiment is as follows Figure 2 The steps shown are described below:

[0065] Step 101: The air conditioner is powered on and started to operate;

[0066] Step 102: Enter cooling / dehumidification / heating / automatic mode;

[0067] Step 103: The air conditioner enters a stop valve cutoff protection detection mode;

[0068] Step 104: Detect the temperature TN1 of the evaporator coil of the indoor unit and the temperature TW1 of the condenser coil of the outdoor unit;

[0069] Step 105: Detect the temperature TN2 of the evaporator coil of the indoor unit and the temperature TW2 of the condenser coil of the outdoor unit;

[0070] In one embodiment, if step 102 enters cooling or dehumidification or cooling in automatic mode, step 104 specifically detects the indoor evaporator coil temperature TN1 and the outdoor condenser coil temperature TW1 within 1 minute after the indoor fan is started, and step 105 specifically detects the indoor evaporator coil temperature TN2 and the outdoor condenser coil temperature TW2 within 4 minutes of the compressor running.

[0071] In one embodiment, if step 102 enters heating or heating in automatic mode, step 104 specifically detects the indoor evaporator coil temperature TN1 and the outdoor condenser coil temperature TW1 within 50 seconds after the indoor fan is started, and step 105 specifically detects the indoor evaporator coil temperature TN2 and the outdoor condenser coil temperature TW2 within 3 minutes of the compressor running.

[0072] Step 106: Determine whether |TN1-TN2|≥2 is satisfied, if yes, execute step 110, otherwise execute step 107;

[0073] Step 107: Determine whether |TW1-TW2|≥2 is satisfied, if yes, execute step 108, otherwise execute step 109;

[0074] Step 108: Report the stop valve cut-off protection failure, and end;

[0075] In this embodiment, the stop valve protection failure is understood in the same way as the stop valve failure in Example 1. This step specifically controls the compressor to stop running while reporting an error to the user.

[0076] Step 109: Report a refrigerant shortage protection fault, and end;

[0077] In this embodiment, the refrigerant shortage protection fault is understood in the same way as the refrigerant shortage fault in Embodiment 1. This step specifically controls the compressor to stop running while reporting an error to the user.

[0078] Step 110: Detect the return air outlet temperature TH of the indoor unit;

[0079] Step 111: determine whether |TN2-TH|≥5 is satisfied, if yes, execute step 112, otherwise return to execute step 110;

[0080] Step 112: Exit the stop valve protection detection mode, and end.

[0081] Specifically, the stop valve cut-off protection detection mode is exited only when the air conditioner is currently turned on, and the stop valve cut-off protection detection mode will be entered by default when the air conditioner is turned on next time.

[0082] In one embodiment, when the air conditioner is in cooling or dehumidification mode or automatic cooling mode, if the difference between the indoor evaporator coil temperature TN2 and the indoor return air outlet temperature TH is detected to be greater than or equal to 5 after the compressor is started, the timing starts, the accumulated time is recorded as t1, and it is not cleared to zero; when the air conditioner is in heating or automatic heating mode, if the difference between the indoor evaporator coil temperature TN and the indoor return air outlet temperature TH is detected to be greater than or equal to 5 after the compressor is started, the timing starts, the accumulated time is t2, and it is not cleared to zero; when the air conditioner is turned on and runs to step 103 each time, the sum of t1 and t2, that is, the accumulated time, is first judged. If t1+t2>20, that is, the accumulated time is as long as 20 hours, it is determined that the stop valve is opened, the user installation is completed, and the stop valve protection function is permanently invalid, that is, the detection steps after step 103 will not be executed. Only when it is judged that the sum of t1 and t2, that is, the accumulated time, does not reach 20 hours, will the stop valve stop protection detection mode of this embodiment be entered.

[0083] Example 3

[0084] The present invention also provides an air conditioner, such as Figure 3 As shown, it includes an indoor unit 300, an outdoor unit 400 and a controller 500, the indoor unit 300 includes an indoor heat exchanger 301, an indoor unit coil temperature sensor 302, an indoor fan 303 and a return air temperature sensor 304, the outdoor unit 400 includes an outdoor heat exchanger 401, an outdoor unit coil temperature sensor 402, a compressor 403 and a stop valve 404, and the controller 500 is configured to execute the air conditioner fault detection method in the above method embodiment.

[0085] In this embodiment, the functional configuration of the controller 500 may include a first detection module, a second detection module, a third detection module, a judgment module, a fault prompt module, and a timing module. The functional description of each module is as follows:

[0086] The first detection module is used to detect the temperature of the evaporator coil of the indoor unit to obtain a first detection temperature, and detect the temperature of the condenser coil of the outdoor unit to obtain a second detection temperature when the air conditioner is in a first preset operating state;

[0087] The second detection module is used for detecting the temperature of the evaporator coil of the indoor unit to obtain a third detection temperature, and detecting the temperature of the condenser coil of the outdoor unit to obtain a fourth detection temperature when the air conditioner is in the second preset operating state;

[0088] A judgment module: used to judge whether the first detection temperature, the second detection temperature, the third detection temperature and the fourth detection temperature meet a preset condition;

[0089] When the first preset condition is met, determining the fault detection result as a stop valve fault;

[0090] When the second preset condition is met, the fault detection result is determined as a refrigerant shortage fault;

[0091] When a third preset condition is met, a third detection module is triggered;

[0092] The third detection module is used to detect the temperature of the return air outlet of the indoor unit and record it as the fifth detection temperature. When the difference between the third detection temperature and the fifth detection temperature is greater than or equal to a third preset value, the current detection mode is exited.

[0093] In one embodiment, the controller in this embodiment may also include a timing module for timing the running time of the compressor when the difference between the third detection temperature and the fifth detection temperature is greater than or equal to a third preset value, and permanently terminating the detection of the stop valve fault when the accumulated timing exceeds the third preset time value.

[0094] In one implementation, the controller in this embodiment may further include a fault prompt module, which is used to give a corresponding prompt to the user according to the fault detection result determined by the judgment module. For example, different faults of the air conditioner have corresponding error codes. In this embodiment, different fault detection results will correspond to different error codes, and the corresponding fault detection result can be prompted to the user by displaying the error code on the display panel of the air conditioner.

[0095] The controller of the air conditioner is used to execute Figure 1 The air conditioner fault detection method embodiment shown in the figure has similar technical principles, technical problems solved and technical effects produced. Technicians in this technical field can clearly understand that for the convenience and conciseness of description, the specific working process and related instructions of the controller can refer to the contents described in the embodiment of the method, which will not be repeated here.

[0096] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0097] Furthermore, the present invention also provides a control device. In an embodiment of a control device according to the present invention, the control device includes a processor and a storage device, the storage device can be configured to store a program for executing the air conditioner fault detection method of the above method embodiment, and the processor can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the air conditioner fault detection method of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The control device can be a control device device formed by various electronic devices.

[0098] Furthermore, the present invention also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium can be configured to store a program for executing the air conditioner fault detection method of the above method embodiment, and the program can be loaded and run by the processor to implement the above air conditioner fault detection method. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.

[0099] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0100] Those skilled in the art will appreciate that the modules in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0101] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for detecting air conditioner faults, characterized in that: The method comprises: The air conditioner is powered on and starts running, and enters the fault detection mode; In a first preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain a first detection temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain a second detection temperature; In the second preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain a third detection temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain a fourth detection temperature; Determining whether the first detected temperature, the second detected temperature, the third detected temperature, and the fourth detected temperature meet a preset condition; When the preset condition is met, a fault detection result of the air conditioner is determined according to the satisfied preset condition.

2. The method according to claim 1, characterized in that The preset condition includes a first preset condition, wherein the first preset condition means that the difference between the first detection temperature and the third detection temperature is less than a first preset value and the difference between the second detection temperature and the fourth detection temperature is greater than or equal to a second preset value; If the first preset condition is met, the fault detection result of the air conditioner is determined to be a stop valve fault.

3. The method according to claim 1, characterized in that The preset condition includes a second preset condition; the second preset condition means that the difference between the first detection temperature and the third detection temperature is less than the first preset value and the difference between the second detection temperature and the fourth detection temperature is less than the second preset value; If the second preset condition is met, the fault detection result of the air conditioner is determined to be a refrigerant shortage fault.

4. The method according to claim 1, characterized in that: The first preset operating state refers to an operating state in which the air conditioner is turned on and enters cooling, dehumidification, heating or automatic mode, and the running time of the internal fan after starting does not exceed the first preset time value; The second operating state refers to an operating state in which the air conditioner is turned on to enter a cooling, dehumidifying, heating or automatic mode, and the operating time of the compressor after starting does not exceed a second preset time value.

5. The method according to claim 2, characterized in that: The preset condition also includes a third preset condition; the third preset condition means that the difference between the first detected temperature and the third detected temperature is greater than or equal to a first preset value; If the third preset condition is met, the return air outlet temperature of the indoor unit is detected and recorded as the fifth detected temperature, and the current detection mode is exited when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to the third preset value.

6. The method according to claim 5, characterized in that: The method further includes: when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to a third preset value, timing the running time of the compressor, and permanently ending the detection of the stop valve fault when the accumulated timing exceeds the third preset time value.

7. The method according to claim 2, characterized in that: When the stop valve failure is determined, the method further includes: controlling the compressor to stop running, and / or prompting the user with the failure detection result.

8. An air conditioner, comprising an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor heat exchanger and an indoor fan, and the outdoor unit comprises an outdoor heat exchanger, a compressor, and a stop valve, wherein: It also includes an indoor unit coil temperature sensor, an outdoor unit coil temperature sensor and a controller; the controller is configured to execute the air conditioner fault detection method according to any one of claims 1 to 7.

9. A control device, comprising a processor and a storage device, wherein the storage device is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by the processor to execute the air conditioner fault detection method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the air conditioner fault detection method according to any one of claims 1 to 7.

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