Water heater’s fan runs continuously even when there is no demand for hot water
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
Safety first: Continuous fan operation is not usually dangerous but indicates a control fault. Do not disconnect internal wiring yourself.
User checks:
- Turn the appliance off at the control panel and then at the mains. After a few minutes, restore power and see if the behaviour persists.
Engineer actions:
- Check the PCB fan relay for sticking contacts and replace the PCB if necessary.
- Verify that there is no external control signal incorrectly calling for operation.
- Inspect wiring for shorts between control lines.
Persistent control faults require PCB diagnosis and likely replacement.
Repair Difficulty
Required Part
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