Troubleshooting for Air to Water Heat Pump Problems

Like other household appliances, air to water heat pumps will inevitably have some errors or failures when in use. It may take too long to wait for after-sales support, so it is necessary for users to master some maintenance knowledge by themselves. Following is a list of some common problems and corresponding solutions:

(These solutions are for reference only. For specific problems, please contact profesional technical support for help. )

Compressor oil loss?

Failure Analysis: 1. Absorption pressure is too low; 3. The opening of the thermal expansion valve is not enough.

Solutions: 1. Increase the side load of the evaporator and check whether the absorption pipe valve is blocked; 2. Adjust the opening degree of the thermal expansion valve.

Compressor too noisy?

Failure Analysis: 1. low oil pressure; 2. muffler or exhaust valve broken; 3. internal pipeline and fastening part of the valve loosen and vibrate; 4. excessive opening of thermal expansion valve.

Solutions: 1. Replace lubricants, mufflers or exhaust valves; 2. Inspect and fasten compressor, pipeline and valves; 3. Adjust the opening degree of the thermal expansion valve.

Compressor unable to shut down?

Failure Analysis: 1. The value of sensor detector resistance is wrong or sensor line is broken; 2. Thermostat breaks down or is wrongly placed.

Solutions: 1. Replace the sensor detector; 2. Replace or repair the thermostat.

Poor heating capacity?

Failure Analysis: 1. Compressor exhaust valve and thermal expansion valve damage; 2. The system is lack of refrigerant or having air or other non-condensable gases; 3. Failure of the defrost controller and time relay; 4. Electromagnetic reversing valve leakage; 5. Hydrophilic aluminum sheet is blocked by dust.

Solutions: 1. Replace or repair exhaust valve and thermal expansion valve; 2. Replenish refrigerant or replace desiccant/refrigerant after leak detection; 3. Replace and repair the defrosting controller or time relay; 4. Replace the electromagnetic reversing valve; 5. Wash the hydrophilic aluminium sheet with a brush.

Frosting on the surface of the compressor?

Failure Analysis: 1. Thermal expansion valve fails or has excessive opening; 2. Thermo-bulb of the thermal expansion valve drops off; 3. Thermal expansion valve core is stuck or temperature setting is inappropriate; 4. Refrigerant filling is insufficient.

Solutions: 1. Adjust, clean and replace the thermal expansion valve; 2. Rewrap the thermostat; 3. Re-adjust the thermal expansion valve core or re-set the temperature; 4. Leak detection and refrigerant filling.