The invention discloses a
heat pump water heater defrosting control method and a
heat pump water heater using the method. In a
heat pump water heater control program, an operation method of adding a forced opening
defrosting mode is adopted, so that under the conditions that the weather is very severe and the automatic
defrosting fails, the defrosting mode is automatically converted into defrosting at the set time or the manual forced defrosting by users, the defrosting can be continuously carried out, the
heating efficiency of the
heat pump water heater is enhanced, and the operation reliability is improved. In addition, the
heat pump water heater using the method has the advantages that through the monitoring by a monitoring device and the
structure matching of an outdoor
heat exchanger coil
pipe sensor, an outdoor environment sensor, a water inlet monitoring sensor and a water outlet monitoring sensor, the monitoring device controls the operation sequence of the compressor, a gas-liquid separator, a
heat exchanger, an
electronic expansion valve, a condenser and a four-way valve, the work medium flowing direction is changed, the operation method of adding the forced opening defrosting mode is adopted in the
heat pump water heater control program, the operation is convenient, and the structure is reasonable.