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Solved it thanks for the help. Turns out the batteries were on the low side, enough power for the thermostat but not to transmit. After a full reset the battery icon started flashing. Seems to be working now!

No, i've switched the thermostat to "OFF" and the CH1 light is still lit and the boiler keeps firing up.

First post please be gentle! We have recently bought our first house which has a Danfoss TPERF thermostat in the hallway and a unit next to and connected to the boiler. The thermostat has been to set up to the times/temp we would like, however i have noticed that when we set the temperature...