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Thermostat not controlling the boiler

I have installed the wired thermostat but it doesn’t seem to control the boiler. I set a target temperature, but the boiler does not shut off once the target is reached - it carries on heating and pushes on to higher temperatures. This is true in the smart schedule and manual settings.
Can anyone help or guide me with this?

Answers

  • Whats the boiler and is it running in relay mode or digital control mode? Is there a zone valve handling central heating? Come back with this information and we could think this through with you.