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Please could anybody help? I have a siemens rdj10rf room thermastat and a Glow worm betacom 24 condensing boiler. my problem is all works ok with the exception of the thermostat does not turn off at night. I have it set to 21 during the day and at 16 at night but never drops below about 19...

Please could anybody help? I have a siemens rdj10rf room thermastat and a Glow worm betacom 24 condensing boiler. my problem is all works ok with the exception of the thermostat does not turn off at night. I have it set to 21 during the day and at 16 at night but never drops below about 19...