Common faults and solutions of heat pump water heaters

1. Power and startup faults

① Unable to start

Check the power switch, circuit connections, and fuses, replace the burnt out contactor

When the compressor cannot start, it is necessary to check whether the overheat protection is triggered (commonly caused by setting the outlet temperature too high)

② Abnormal water pump

Water circulation failure requires replenishing water and draining air, and regularly cleaning the water filter (recommended once a month)

2. Decreased heating performance

① Insufficient heating

Supplement refrigerant after system leak detection

②Low heat exchange efficiency

Use specialized cleaning agents for deep cleaning

③Poor insulation

Replace rubber insulation cotton (thickness ≥ 25mm)

3. Protection device triggered

①High voltage protection (code 12/E1)

The condenser is clogged and needs to be cleaned, and excessive refrigerant needs to be released (pressure should be maintained at 1.8-2.2MPa)

②Low voltage protection (code 13/E2)

Check for refrigerant leaks and replace the dry filter (every 2 years)

③Sensor malfunction (code E3/E6)

Measure the resistance of the sensor (R25 ℃ should be 49.1k Ω) and replace the drift probe