Chaffoteaux Overheating / Poor Temperature Regulation

Water heater produces water that is too hot, even at low temperature settings.

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

Faulty DHW NTC sensor, Sticking gas valve at high fire, Incorrect minimum gas setting, Limescale restricting flow

Safety: Risk of scalding. Warn occupants and reduce use until resolved.

Check temperature setting: Confirm the front panel temperature knob or digital setting is not at maximum.
Verify DHW NTC: Test and replace the DHW temperature sensor if it reads incorrectly.
Descale water path: Limescale can reduce flow and cause high outlet temperatures. Descale the plate or primary heat exchanger.
Gas valve check: A technician should verify that the gas valve can modulate down to minimum rate and adjust if necessary.

Hard 4/5

DHW NTC Temperature Sensor

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