Method for detecting a faulty air handler in a heat pump appliance

1. A method for detecting a faulty air handler of a heat pump appliance, comprising:

initiating a test of an air handler of the heat pump appliance;

activating a compressor of the heat pump appliance during the test of the air handler of the heat pump appliance;

deactivating the compressor of the heat pump appliance at a predetermined period of time after said step of activating;

at said step of deactivating, determining: (1) a temperature of refrigerant at an evaporator inlet of the heat pump appliance with an evaporator inlet temperature sensor; (2) a temperature of refrigerant at an evaporator outlet of the heat pump appliance with an evaporator outlet temperature sensor; and (3) a temperature of fluid being treated by the heat pump appliance with a third temperature sensor adjacent to a condenser; and requesting replacement of the air handler of the heat pump appliance when: (1) a difference between the temperature of refrigerant at the evaporator outlet and the temperature of refrigerant at the evaporator inlet is less than a first temperature value; and (2) a difference between the temperature of refrigerant at the evaporator inlet and the temperature of fluid being treated by the heat pump appliance is less than a second temperature value.

2. The method of claim 1 , further comprising:

performing a pre-check of the heat pump appliance prior to said step of initiating;

measuring the temperature of fluid being treated by the heat pump appliance during the pre-check of the heat pump appliance; and

gauging a temperature of ambient air about the heat pump appliance during the pre-check of the heat pump appliance;

wherein said step of initiating comprises initiating the test of an air handler of the heat pump appliance when the temperature of fluid being treated by the heat pump appliance from said step of measuring is within about ten degrees Fahrenheit of a set temperature of the heat pump appliance and when the temperature of ambient air about the heat pump appliance from said step of gauging is greater than about fifty-five degrees Fahrenheit.

3. The method of claim 2 , further comprising replacing an evaporator inlet temperature sensor of the heat pump appliance prior to said step of initiating when the temperature of refrigerant at the evaporator inlet is greater than a sum of the temperature of ambient air about the heat pump appliance and about five degrees Fahrenheit.

4. The method of claim 1 , further comprising requesting a refrigerant leak search, an evaporator inlet temperature sensor inspection, and an evaporator outlet temperature sensor inspection when: (1) the difference between the temperature of refrigerant at the evaporator outlet and the temperature of refrigerant at the evaporator inlet is not less than about fifteen degrees Fahrenheit; or (2) the difference between a set temperature of the heat pump appliance and the temperature of fluid being treated by the heat pump appliance is not less than about ten degrees Fahrenheit.

5. The method of claim 1 , wherein said step of activating comprises increasing a set temperature of the heat pump appliance.

6. The method of claim 1 , wherein said step of requesting comprises presenting a message on a display of the heat pump appliance or on a computing device of a service technician.

7. The method of claim 1 , wherein said steps of initiating, activating, deactivating, determining, and requesting are performed by a controller of the heat pump appliance or a computing device of a service technician.

8. The method of claim 1 , wherein the predetermined period of time is about fifteen minutes.

9. The method of claim 1 , wherein the first temperature value is about fifteen degrees Fahrenheit and the second temperature value is about ten degrees Fahrenheit.