Faults And Troubleshooting Methods of Air Source Heat Pump Units

When the air source heat pump unit malfunctions, it is unclear where to start troubleshooting. Don't worry, today we will teach you how to troubleshoot, including the steps to troubleshoot, common faults of the unit, and troubleshooting methods, for your learning and reference.

Complete list of faults and troubleshooting methods for air source heat pump units - air energy heat pump manufacturers

Understand troubleshooting

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.

Common troubleshooting of 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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