Automatic Heating AHGR410AW Series, Installation And Instruction Manual, Page: 20 / 26

Inverter Air Source Heat Pump (AHGR410AW) - Installation and Instruction Manual
06. Troubleshooting
6.4 Equipment Fault Table
Failure Possible causes for the failure Solutions
Heat pump cannot be started • Incompatible power supply
• Power supply cable is loose
• Circuit breaker is open • Shut off the power and check the power supply.
• Check the power cable and fix the connection.
• Check for the cause and replace the fuse or circuit
breaker.
Water pump is running with
high noise or without water • Lack of water in the piping
• Too much air in the water loop
• Water valves are closed
• Dirt or blockage on the water filter • Check the water supply & charge water into the piping.
• Discharge the air from the water loop.
• Open the valves in the water loop.
• Clean the water filter.
Heat pump capacity is low;
compressor does not stop • Lack in refrigerant
• Bad insulation on water pipe
• Low heat exchange rate on air side exchanger
• Lack of water flow • Check for gas leakage and recharge the refrigerant.
• Fix the insulation on the water pipe.
• Clean the air side heat exchanger.
• Clean the water filter.
High compressor exhaust • Too much refrigerant
• Low heat exchange rate on air side exchanger • Discharge the redundant gas.
• Clean the air side heat exchanger.
Low pressure problem of the system • Lack of gas
• Blockage on filter or capillary
• Lack of water flow • Check for gas leakage and recharge Freon.
• Replace filter or capillary.
• Clean the water filter and discharge the air from
the water loop.
Compressor does not run • Power supply failure
• Compressor contactor is broken
• Power cable is loose
• Protection on compressor
• Wrong setting on return water temp.
• Lack of water flow • Check the power supply.
• Replace the compressor contactor.
• Tighten the power cable.
• Check the compressor exhaust temp.
• Reset the return water temp.
• Clean the water filter and discharge the air from
the water loop.
High noise from the compressor • Liquid refrigerant goes into the compressor
• Compressor failure • Bad evaporation; check the cause for bad evaporation
and get rid of this.
• Change the compressor.
Fan does not run • Failure on fan relay
• Fan motor is broken • Replace fan relay.
• Replace fan motor.
The compressor runs but heat pump
does not have heating or cooling
capacity • No gas in the heat pump
• Heat exchanger is broken
• Compressor failure • Check for system leakage and recharge refrigerant.
• Find out the cause and replace the heat exchanger.
• Replace compressor.
Low outlet water temperature • Low water flow rate
• Low setting on the desired water temp. • Clean the water filter & discharge air from the water loop.
• Reset the desired water temperature.
Low water flow protection • Lack of water in the system
• Failure on flow switch • Clean the water filter & discharge air from the water loop.
• Replace the flow switch.
You can refer to the malfunction table below to find out the failure cause & solution
20