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Complete list of faults and troubleshooting methods for air source heat pump units - air energy heat pump manufacturers
1. Understand the operation status, fault situation, and fault codes of the unit through telephone communication or on-site inspection;
2. Preliminary determination of the cause of the fault by querying the fault code;
3. Search for faults and replace faulty parts based on fault codes and maintenance experience;
4. Debug and operate the unit.
Fault status: Unit not running
Possible cause of malfunction: power failure; Loose power supply wiring of the unit; Unit control power fuse blown
Solution: Turn off the power switch and check the power supply; Identify the cause and fix it; Replace with a new fuse
Fault status: The water pump is running but the water is not circulating or the water pump has high noise
Possible cause of malfunction: water shortage in the water system; There is air in the water system; The water system valves are not fully open; Dirty and clogged water filter
Solution: Check the system water replenishment device and add water to the system; Remove air from the water system; Fully open the water system valves; Cleaning water filter
Fault status: The heating capacity of the unit is low
Possible cause of malfunction: Insufficient refrigerant; Poor insulation of the water system; The drying filter is blocked; Poor heat dissipation of the air heat exchanger; Insufficient water flow rate
Solution: System leak detection and refrigerant filling; Strengthen the insulation of the water system; Replace the drying filter; Clean the air heat exchanger; Cleaning water filter
Fault status: Compressor not running
Possible cause of malfunction: power failure; Loose wiring; Compressor overheating protection; The outlet water temperature is too high; Insufficient water flow rate
Solution: Identify the cause and solve the power failure; Identify the loosening point and repair it; Identify the hot cause and troubleshoot before restarting; Reset the outlet water temperature; Clean the water filter to remove air from the system
Fault status: Compressor running with high noise
Possible cause of malfunction: liquid formulation entering the compressor; Internal parts of the compressor are damaged
Solution: Check if the expansion valve is ineffective; Replace compression
Fault status: Fan not running
Possible cause of malfunction: Loose fan fastening screws; Fan motor burned out; Fan capacitor damaged
Solution: Tighten the fastening screws; Replace the fan; Replace the fan capacitor
Fault status: The compressor is running, but the unit is not heating
Possible cause of malfunction: All refrigerant leaks; Compressor malfunction
Solution: System leak detection and refrigerant filling; Replacing the compressor
Fault status: protection for low water flow rate of the unit
Possible cause of malfunction: Insufficient system water flow rate; Water flow switch not reset
Solution: Clean the water filter to remove air from the system; Adjust or replace the water flow switch
Fault status: Exhaust pressure too high
Possible cause of malfunction: Excessive refrigerant; There is non condensable gas in the fluorine system; Insufficient water flow rate
Solution: Discharge excess refrigerant; Discharge non condensable gases; Check the water system and increase the water flow rate
Fault status: suction pressure too low
Possible cause of malfunction: clogged drying filter; The pressure drop through the heat exchanger is too high
Solution: Replace the drying filter; Check if the opening of the thermal expansion valve is appropriate
Fault status: compressor oil loss
Possible cause of malfunction: Insufficient lubricating oil
Solution: Add lubricating oil
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