Termet
Overheating / Temperature Overshoot
Water heater produces water that is too hot, risk of scalding, even at low temperature settings.
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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 outlet NTC sensor on Termet heater, Sticking gas valve not reducing flame, Incorrect temperature calibration on PCB, Limescale causing localized overheating
How to Fix / Troubleshooting
Safety: Immediately reduce the set temperature and warn users about scalding risk.
- Verify setpoint: Confirm the temperature setting on the Termet control panel is not accidentally set too high.
- Check NTC sensor: Inspect and test the outlet NTC sensor. Replace if readings are unstable or out of range.
- Descale: Descale the heat exchanger to prevent hot spots that can cause overshoot.
- Professional service: If water remains too hot, a technician should check gas valve modulation and recalibrate or replace the control board.
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Repair Difficulty
Hard
4/5
Required Part
DHW Outlet NTC Sensor
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