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

Abstract

The present application relates to the air conditioning technical field, specifically provide a kind of air conditioner fault detection method, air conditioner, control device and storage medium, to solve the detection problem of stop valve failure in air conditioner.To this end, the method of the present application includes whether the judgment of first preset operating state under detection indoor unit evaporator coil temperature and outdoor unit condenser coil temperature, and second preset operating state under detection indoor unit evaporator coil temperature and outdoor unit condenser coil temperature meet preset condition, to determine air conditioner fault category, using the method of the present application can effectively reduce the risk of causing air conditioner compressor damage, improve machine reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, specifically to an air conditioner fault detection method, an air conditioner, a control device and a storage medium. BACKGROUND

[0002] A split type air conditioner is composed of an indoor unit and an outdoor unit, and is connected as a whole during installation. In order to facilitate installation and maintenance, a stop valve is provided in the outdoor unit of the air conditioner to control the opening of the refrigerant circulation. On the one hand, during installation, if the air conditioner is started to operate after installation without opening the stop valve in the outdoor unit, the compressor is likely to be damaged in a short time, and even the pipeline may be blown up. On the other hand, during use of the air conditioner, if the refrigerant amount of the air conditioner is reduced to a certain extent, the operation of the air conditioner is likely to cause wear of the compressor and even cause cylinder seizure. It can be seen that it is particularly important to detect the lack of refrigerant and the unopened stop valve which are likely to cause faults of the air conditioner.

[0003] Therefore, how to detect faults of the air conditioner in time through a program after installation and maintenance becomes a technical problem to be solved urgently. SUMMARY

[0004] In order to overcome the above defects, the air conditioner fault detection method, the air conditioner, the control device and the storage medium provided by the present application can help to solve or at least partially solve the technical problem of faults of the air conditioner caused by the unopened stop valve.

[0005] In a first aspect, the present application provides an air conditioner fault detection method, which comprises:

[0006] The air conditioner is powered on and operated to enter a fault detection mode;

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

[0008] In a 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] It is judged whether the first detection temperature, the second detection temperature, the third detection temperature and the fourth detection temperature satisfy a preset condition;

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

[0011] The above preset condition includes a first preset condition, and the first preset condition refers to that a difference between the first detection temperature and the third detection temperature is less than a first preset value, and a 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 as a stop valve fault.

[0013] The preset condition includes a second preset condition; the second preset condition refers to a difference between the first detection temperature and the third detection temperature being less than a first preset value and a difference between the second detection temperature and the fourth detection temperature being less than a second preset value.

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

[0015] Preferably, the first preset operating state refers to an operating state in which the air conditioner is powered on to enter a cooling or dehumidifying or heating or automatic mode and the internal fan is started and runs for a duration not exceeding a first preset time value; and the second operating state refers to an operating state in which the air conditioner is powered on to enter a cooling or dehumidifying or heating or automatic mode and the compressor is started and runs for a duration not exceeding a second preset time value.

[0016] Further, the preset condition further includes a third preset condition; the third preset condition refers to a difference between the first detection temperature and the third detection temperature being greater than or equal to a first preset value.

[0017] If the third preset condition is met, the temperature of the inner machine return air outlet is detected and recorded as a fifth detection temperature, and when a 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.

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

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

[0020] In a second aspect, the present application provides an air conditioner, including an indoor unit and an outdoor unit, the indoor unit including an indoor heat exchanger and an internal fan, the outdoor unit including an outdoor heat exchanger, a compressor and a stop valve, further including an indoor coil temperature sensor, an outdoor coil temperature sensor and a controller; the controller is configured to perform the method described in any one of the technical solutions of the air conditioner fault detection method.

[0021] In a third aspect, the present application provides a control device, comprising a processor and a storage device, the storage device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to execute the method according to any one of the technical solutions of the air conditioner fault detection method.

[0022] In a fourth aspect, the present application provides a computer readable storage medium, wherein a plurality of program codes are stored, the program codes being adapted to be loaded and run by a processor to execute the method according to any one of the technical solutions of the air conditioner fault detection method.

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

[0024] In the implementation of the technical solutions of the present application, by detecting whether the indoor evaporator coil temperature and the outdoor condenser coil temperature detected in the first preset running state, and the indoor evaporator coil temperature and the outdoor condenser coil temperature detected in the second preset running state meet the preset conditions, the air conditioner fault detection result is determined, and further according to the different preset conditions met, it is determined whether the fault detection result is a stop valve fault or a lack of refrigerant fault. This scheme simultaneously combines the detection of the indoor evaporator coil and the outdoor condenser coil temperature, which can improve the accuracy of the air conditioner refrigerant circulation system fault identification, reduce the risk of compressor damage caused by forgetting to open the stop valve, and improve the machine use reliability. BRIEF DESCRIPTION OF DRAWINGS

[0025] The disclosure of the present application will become more readily understood by referring to the accompanying drawings. It will be readily understood to those skilled in the art that the drawings are only intended to illustrate the present application and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the figures are used to represent similar components, wherein:

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

[0027] Figure 2 is a flowchart of the main steps of an air conditioner fault detection method according to another embodiment of the present application;

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

[0029] List of reference signs :

[0030] 300: Indoor unit; 301: Indoor heat exchanger; 302: Indoor unit coil temperature sensor; 303: Indoor fan; 304: Return air vent temperature sensor; 400: Outdoor unit; 401: Outdoor heat exchanger; 402: Outdoor unit coil temperature sensor; 403: Compressor; 404: Shut-off valve; 500: Controller. Detailed Implementation

[0031] Some embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] In the description of this invention, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. 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 terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0033] Example 1

[0034] See appendix Figure 1 , Figure 1 This is a schematic flowchart illustrating the main steps of an air conditioner fault detection method according to an embodiment of the present invention. Figure 1 As shown, the air conditioner fault detection method in this embodiment of the invention mainly includes the following steps S101-S107.

[0035] Step S101: The air conditioner is powered on and put into operation, entering the detection mode;

[0036] In this embodiment, before entering the detection mode, the system also includes entering the working mode based on user operation. This working mode can be any one of the following: cooling mode, dehumidification mode, heating mode, or automatic mode.

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

[0038] In this embodiment, the first preset operating state refers to the operating state in which the air conditioner is turned on and enters the cooling, dehumidification, heating or automatic mode and the running time of the indoor 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 indoor unit evaporator coil is detected to obtain the third detection temperature, and the temperature of the outdoor unit condenser coil is detected to obtain the fourth detection temperature.

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

[0041] Step S104: Determine whether the first detection temperature, the second detection temperature, the third detection temperature, and the fourth detection temperature meet the preset conditions;

[0042] In one embodiment, the preset conditions include at least a first preset condition, wherein 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 conditions include 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 refers to the difference between the first detection temperature and the third detection temperature being less than a first preset value and the difference between the second detection temperature and the fourth detection temperature being greater than or equal to a second preset value; the second preset condition refers to the difference between the first detection temperature and the third detection temperature being less than the first preset value and the difference between the second detection temperature and the fourth detection temperature being less than the second preset value; the third preset condition refers to the difference between the first detection temperature and the third detection temperature being 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 based on empirical values ​​or based on the temperature sensor error used for temperature detection. Preferably, both the first preset value and the second preset value are set to 2.

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

[0047] Step S105: Determine the fault detection result as a shut-off valve fault.

[0048] In this embodiment, the shut-off valve malfunction specifically refers to the shut-off valve not opening.

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

[0050] Step S107: Detect the temperature of the indoor unit's return air vent 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 the third preset value, exit the current detection mode.

[0051] In this embodiment, the third preset value can be determined based on empirical values ​​or based on the error of the 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 detection temperature and the fifth detection temperature is greater than or equal to a third preset value, the method further includes:

[0053] The compressor's running time is timed, and the detection of the shut-off valve fault is permanently terminated when the cumulative time exceeds the third preset time value.

[0054] In this embodiment, the compressor's timing is activated whenever the difference between the third and fifth detected temperatures is greater than or equal to a third preset value. If the difference between the third and fifth detected temperatures does not meet the condition of being greater than or equal to the third preset value during the timing process, the timing is stopped but not reset. Accumulation continues until the condition is met again, until the accumulated time exceeds the third preset time value, at which point the detection of the shut-off valve malfunction is permanently terminated. Preferably, the third preset time value is 20 hours.

[0055] In this embodiment, the step of timing the compressor's running time and permanently ending the detection of the shut-off valve fault when the accumulated time exceeds a third preset time value specifically includes:

[0056] The running time of the air conditioner after the compressor starts in cooling, dehumidification or automatic mode is timed, and the cumulative running time is recorded as the first time value;

[0057] The running time of the air conditioner after the compressor starts in heating or automatic mode is timed, and the cumulative running time is recorded 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 to be that there is no shut-off valve fault, and the detection of shut-off valve fault is permanently terminated.

[0059] In one embodiment, permanently ending the detection of the shut-off valve malfunction can be achieved by setting a detection flag to determine whether to enter the detection mode. For example, after the air conditioner is powered on and running in step S101, the presence of the detection flag is checked first. If it is present, the detection mode is entered; otherwise, the detection mode cannot be entered. Correspondingly, in step 107, the detection flag is cleared only when the difference between the third and fifth detection temperatures is greater than or equal to a third preset value, and the cumulative time of the compressor's operation reaches the third preset time value, thereby permanently ending the detection of the shut-off valve malfunction.

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

[0061] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of the present invention.

[0062] Example 2

[0063] In one specific application example of the present invention, such as Figure 2 This paper presents a method for detecting air conditioner faults, particularly suitable for detecting faults in the shut-off valve protection of air conditioners. Currently, air conditioners on the market determine whether refrigerant circulation is abnormal by detecting the temperature of the indoor unit's evaporator coil. However, there are many reasons for abnormal refrigerant circulation. This embodiment, based on existing methods for detecting abnormal refrigerant circulation in air conditioners, further detects the temperature of the outdoor unit's condenser coil to determine whether the abnormal refrigerant circulation is caused by a lack of refrigerant or by the shut-off valve protection.

[0064] The specific workflow 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: Power on and start the air conditioner;

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

[0067] Step 103: The air conditioner enters the shut-off valve shut-off protection detection mode;

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

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

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

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

[0072] Step 106: Determine whether |TN1-TN2|≥2 is satisfied. If yes, proceed to step 110; otherwise, proceed to step 107.

[0073] Step 107: Determine whether |TW1-TW2|≥2 is satisfied. If yes, proceed to step 108; otherwise, proceed to step 109.

[0074] Step 108: Report a fault in the shut-off valve's shut-off protection, end;

[0075] In this embodiment, the shut-off valve shut-off protection fault is understood in the same way as the shut-off valve fault in Embodiment 1. Specifically, this step involves controlling the compressor to stop running while reporting an error to the user.

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

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

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

[0079] Step 111: Determine if |TN2-TH|≥5 is satisfied. If yes, proceed to step 112; otherwise, return to step 110.

[0080] Step 112: Exit the shut-off valve shut-off protection detection mode and end.

[0081] Specifically, the shut-off valve shut-off protection detection mode is exited only when the air conditioner is currently running. It will automatically re-enter the shut-off valve shut-off protection detection mode the next time the air conditioner is turned on.

[0082] In one implementation, when the air conditioner is in cooling or dehumidifying mode or automatic cooling mode, if the difference between the indoor unit evaporator coil temperature TN2 and the indoor unit return air vent temperature TH is greater than or equal to 5 after the compressor starts, timing begins, and the accumulated time is recorded as t1, which is not reset. When the air conditioner is in heating or automatic heating mode, if the difference between the indoor unit evaporator coil temperature TN and the indoor unit return air vent temperature TH is greater than or equal to 5 after the compressor starts, timing begins, and the accumulated time is recorded as t2, which is not reset. When the air conditioner is turned on and reaches step 103, the sum of t1 and t2, i.e., the accumulated time, is first judged. If t1 + t2 > 20, i.e., the accumulated time is as long as 20 hours, it is determined that the shut-off valve has been opened, the user installation has been completed, and the shut-off valve protection function is permanently disabled. That is, the detection steps after step 103 will not be executed. Only when the sum of t1 and t2, i.e., the accumulated time, does not reach 20 hours will the shut-off valve shut-off 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, the system 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 vent 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 shut-off valve 404. The controller 500 is configured to perform the air conditioner fault detection method in the above method embodiment.

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

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

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

[0088] Judgment module: used to determine whether the first detection temperature, the second detection temperature, the third detection temperature and the fourth detection temperature meet the preset conditions;

[0089] When the first preset condition is met, the fault detection result is determined to be a shut-off valve fault.

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

[0091] The third detection module is triggered when the third preset condition is met.

[0092] The third detection module is used to detect the temperature of the indoor unit's return air vent 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 the third preset value, the current detection mode is exited.

[0093] In one embodiment, the controller in this embodiment may further include a timing module, which is used to time the compressor's running time when the difference between the third detected temperature and the fifth detected temperature is greater than or equal to a third preset value, and to permanently terminate the detection of the shut-off valve fault when the cumulative time exceeds the third preset time value.

[0094] In one implementation, the controller in this embodiment may further include a fault indication module, used to provide corresponding prompts to the user based on the fault detection results 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 results can be indicated to the user by displaying the error codes on the air conditioner's display panel.

[0095] The controller of the aforementioned air conditioner is used for execution Figure 1 The air conditioner fault detection method embodiments shown are similar in technical principle, technical problem solved and technical effect produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process of the controller and related descriptions can be referred to the content described in the method embodiments, and will not be repeated here.

[0096] Those skilled in the art will understand that all or part of the processes in the method of the above embodiment of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

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

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

[0099] Furthermore, it should be understood that since the various modules are only provided to illustrate 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 processor's software, hardware, or a combination of software and hardware. Therefore, the number of modules shown in the figures is merely illustrative.

[0100] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of the present invention; therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.

[0101] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for detecting faults in an air conditioner, characterized in that, The method includes: The air conditioner is powered on and starts running, then enters fault detection mode; In the first preset operating state, the temperature of the evaporator coil of the indoor unit is detected to obtain the first detected temperature, and the temperature of the condenser coil of the outdoor unit is detected to obtain the second detected temperature; the first preset operating state refers to the operating state in which the air conditioner is turned on and enters the cooling, dehumidification, heating or automatic mode and the running time of the indoor fan after starting does not exceed the first preset time value. In the second preset operating state, the temperature of the indoor unit evaporator coil is detected to obtain the third detection temperature, and the temperature of the outdoor unit condenser coil is detected to obtain the fourth detection temperature. The second preset operating state refers to the operating state in which the air conditioner is turned on and enters the cooling, dehumidification, heating or automatic mode, and the running time of the compressor after starting does not exceed the second preset time value. Determine whether the first detection temperature, the second detection temperature, the third detection temperature, and the fourth detection temperature meet preset conditions; When preset conditions are met, the fault detection result of the air conditioner is determined according to the preset conditions met; The preset conditions include a first preset condition, which 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 shut-off valve fault.

2. The method according to claim 1, characterized in that, The preset conditions include 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 a first preset value and the difference between the second detection temperature and the fourth detection temperature is less than a second preset value. If the second preset condition is met, the fault detection result of the air conditioner will be determined as a refrigerant shortage fault.

3. The method according to claim 1, characterized in that, The preset conditions also include a third preset condition; 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. If the third preset condition is met, the indoor unit return air vent temperature is detected and recorded as the fifth detection temperature. When the difference between the third detection temperature and the fifth detection temperature is greater than or equal to the third preset value, the current detection mode is exited.

4. The method according to claim 3, 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 compressor's running time, and permanently ending the detection of the shut-off valve fault when the cumulative timing exceeds the third preset time value.

5. The method according to claim 1, characterized in that, The determination of a shut-off valve malfunction further includes: controlling the compressor to stop running, and / or notifying the user of the malfunction detection result.

6. An air conditioner comprising an indoor unit and an outdoor unit, wherein the indoor unit includes an indoor heat exchanger and an indoor fan, and the outdoor unit includes an outdoor heat exchanger, a compressor, and a shut-off valve, characterized in that, It also includes an indoor unit coil temperature sensor, an outdoor unit coil temperature sensor, and a controller; the controller is configured to perform the air conditioner fault detection method according to any one of claims 1 to 5.

7. A control device, comprising a processor and a storage device, said storage device being adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to perform the air conditioner fault detection method according to any one of claims 1 to 5.

8. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the air conditioner fault detection method according to any one of claims 1 to 5.

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