Drazice heat pump water heater displays H4; unit may shut down with a protection alarm.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Important: High-pressure and refrigerant issues are hazardous. Only certified technicians should work on the sealed system.
User checks:
- Turn OFF power and inspect the condenser coil and air passages. Clean dust and debris with a soft brush or low-pressure air.
- Ensure that the unit has adequate clearance around it as specified by Drazice for proper airflow.
- Reset the unit by switching OFF/ON after a 5–10 minute cool-down.
If H4 reoccurs, a professional must check the high-pressure switch, refrigerant charge, and expansion device, and may need to replace components.
Repair Difficulty
Required Part
We may earn a commission from links on this page.