Chaffoteaux Heating Running Continuously

Radiators get hot even when the room thermostat is turned down or off.

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

Stuck motorized zone valve, Room thermostat contacts stuck closed, Faulty control board relay, Incorrect wiring bypassing controls

Safety: Isolate power before working on controls or valves.

Check thermostat: Turn the thermostat fully down and listen for a click. If no click, the thermostat may be faulty.
Observe zone valves: If fitted, check whether the valve actuator is stuck in the open position. Some have a manual lever that may be latched open.
Reset programmer: Ensure the programmer is not set to 'constant on' mode.
Professional diagnosis: If heating continues despite controls being off, a technician should test the control board relays and wiring.

Medium 3/5

Motorized Zone Valve

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