Vaillant Combi Boiler

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EcoTEC Plus 824 Heating Not Working

The hot water is fine. The heating is not switching on when I switch on the room thermostat in my customary fashion. I have tried turning the boiler knob to maximum temperature but the heating still doesn’t come on. Any Thoughts on this?



Hi Eli,

Definitely sounds like a controller issue.  Either an issue with the controller circuitry / PCB or the thermostat / sensor.  Are any fault codes displaying?


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