Chaffoteaux Thermal Cut-Out / Overheat Cycling

Hot water output stops after a few minutes, then returns after a short wait.

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

Restricted water flow, Scaled heat exchanger, Faulty overheat thermostat, Poor ventilation (open-flue models)

Safety: Risk of overheating; monitor the appliance closely.

Clean filters and aerators: Improve flow through the heater.
Descale heat exchanger: Remove limescale that causes local overheating.
Check ventilation: For open-flue Chaffoteaux heaters, ensure adequate room ventilation and that grilles are not blocked.
Replace overheat thermostat: If it trips prematurely after other issues are resolved, replace the thermostat.

Medium 3/5

Overheat Thermostat

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