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Ferolli optimal 25c timer off radiators still on ?

My boiler seems to be on all the time .british gas man changed programmer and it still does it . The only way I can get it to cool down is to turn radiator temp knob on boiler down and turn all trv ,s off but towel rad still heats

Robert
July 2014

Ferroli Ferroli Optimal 25C Heating, Home Heating Systems Boiler Gas Man

It could be a zone valve faulty,the only way is to test where the boiler supply is coming from

toptrish
July 2014

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Ferolli Boiler Always On - TRV & Timer Issues