Hoval
Overheating DHW
Domestic hot water is excessively hot, risk of scalding
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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.
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Possible Causes
Faulty DHW temperature sensor, Stuck DHW thermostat, Incorrect DHW setpoint on Hoval controller, Failing mixing valve on DHW outlet
How to Fix / Troubleshooting
Safety: Risk of scalding. Warn occupants and label hot taps until resolved.
- Check DHW setpoint: Reduce the DHW temperature setting on the Hoval controller to a safe level (typically 50–60°C).
- Inspect mixing valve: If a thermostatic mixing valve is installed, ensure it is set correctly and not stuck. Exercise the control knob.
- Sensor check: Compare displayed DHW temperature with actual tap temperature; if they differ greatly, the sensor may be faulty.
- Call technician: Persistent overheating requires replacement of faulty sensors or thermostats.
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Repair Difficulty
Medium
3/5
Required Part
DHW Thermostatic Mixing Valve
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