What's the solution when the air source heat pump breaks down?

Analysis of Current Fault Causes
A. Firstly, test the actual current value when the compressor is idling for confirmation.
B. The current transformer and thermal relay may be adjusted too small or have quality problems themselves.
C. Too low or too high voltage may cause excessive current of the compressor.

Fault Causes of Exhaust Probe
A. Too little refrigerant in the system will lead to excessive exhaust temperature.
B. Too much refrigerant in the system will also result in excessive exhaust temperature.
C. Quality problems of the exhaust probe itself may cause exhaust faults.
D. Slight blockage of the throttling device of the heat pump may lead to excessive exhaust pressure and then cause relatively high exhaust temperature.

Fault Causes of High Pressure
A. If it is a repaired heat pump, check whether there is too much refrigerant. It may not be shown when the temperature is low in winter, but it will cause excessive pressure and trigger high-pressure protection in summer.
B. The head and flow rate of the circulating water pump are too small and not equipped according to the company's requirements.
C. Check whether the low water level probe of the water level probe is installed reasonably. The probe should be higher than the circulating water outlet.
D. Scale is generated in the condenser (referred to as casing, high-efficiency canister, plate heat exchanger), resulting in poor heat exchange and causing high pressure in the system. Generally, it is caused by the use of groundwater.
E. Poor detection of the water stop water pressure switch will also trigger the high-pressure alarm.

Unit Does Not Operate
A. Power failure. Disconnect the power switch and check the power supply.
B. The power wiring of the unit is loose. Find out the cause and repair it.
C. The fuse of the control power supply of the unit is blown. Replace it with a new one.

The Water Pump Operates but Water Does Not Circulate or the Water Pump Makes Loud Noise
A. There is a lack of water in the water system. Check the water replenishing device of the system and replenish water to the system.
B. There is air in the system. Remove the air in the water system.
C. The valves in the water system are not all opened. Open the water system valves fully.
D. The water filter is dirty and blocked. Clean the water filter.

The Heating Capacity of the Unit Is Low
A. There is insufficient refrigerant. Check the system for leaks and charge the refrigerant.
B. The heat preservation of the water system is poor. Strengthen the heat preservation of the water system.
C. The drying filter is blocked. Replace the drying filter.
D. The heat dissipation of the air heat exchanger is poor. Clean the air heat exchanger.
E. The water flow rate is insufficient. Clean the water filter.

The Compressor Does Not Operate
A. Power failure. Find out the cause and solve the power failure problem.
B. The compressor contactor is damaged. Replace the contactor.
C. The wiring is loose. Find out the loose points and repair them.
D. The compressor is under thermal protection. Find out the thermal cause, eliminate the fault and then start the machine again.
E. The outlet water temperature is too high. Reset the outlet water temperature.
F. The water flow rate is insufficient. Clean the water filter and remove the air in the system.

The Compressor Operates with Loud Noise
A. Liquid refrigerant enters the compressor. Check whether the expansion valve fails.
B. The internal parts of the compressor are damaged. Replace the compressor.

The Fan Does Not Operate
A. The fastening screws of the fan are loose. Tighten the fastening screws.
B. The fan motor is burned out. Replace the fan.
C. The contactor is damaged. Replace the contactor.

The Compressor Operates, but the Unit Does Not Heat
A. All the refrigerant has leaked. Check the system for leaks and charge the refrigerant.
B. The compressor fails. Replace the compressor.

Water Flow Protection
There are generally two possibilities for water flow protection: the waterway system is not flowing and the water flow switch itself is damaged. Generally, water flow faults are often caused by waterway problems. Specific troubleshooting methods:

Exhaust Pressure Is Too High
A. There is too much refrigerant. Discharge the excess refrigerant.
B. There are non-condensable gases in the fluorine circuit system. Discharge the non-condensable gases.
C. The water flow rate is insufficient. Check the water system and increase the water flow rate.

Suction Pressure Is Too Low
A. The drying filter is blocked. Replace the drying filter.
B. The solenoid valve is not opened. Repair or replace the solenoid valve.
C. The pressure drop through the heat exchanger is too large. Check whether the opening of the thermal expansion valve is appropriate.
D. There is no refrigerant in the heat pump system or it has leaked.

The Wire Controller Fails / Black Screen
A. Black screen of the wire controller: Firstly, confirm whether the unit is powered on, and then replace it with a new wire controller to try. The WeChat official account of Refrigeration Encyclopedia suggests that if it still does not light up, focus on checking whether there is output from the main board of the unit. If there is no output, it may be that the transformer of the main board is damaged or the fuse of the main board is burned out. Just replace it.

Of course, in this case, it is necessary to observe more later and rule out the situation of short circuit of the load to avoid secondary damage to the accessories.
B. The wire controller reports a communication fault: When reporting a communication fault, check whether the wiring is loose. If it is not loose, it is often a voltage problem. Focus on measuring whether the voltage is abnormal.
C. The wire controller is not sensitive: If the wire controller is not sensitive just after being used, it may be that the internal wiring is pressing against the buttons. If the buttons of the wire controller are not sensitive after normal use for a period of time, it may need to be replaced.

Circuit Breaker Trips
A. The circuit breaker cannot be closed: Replace a circuit breaker and ensure that the wires are not loosely connected. If it still doesn't work, it may be that the compressor is grounded or there is a short circuit in the main board. After accurate judgment, the compressor or the main board needs to be replaced.
B. The circuit breaker trips occasionally: It is often caused by loose connection of the circuit breaker wires. Focus on checking whether the wires are firmly connected. Of course, if the circuit breaker is placed in a place with high humidity, it may get damp and cause tripping.