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Mend Ariston Microgenus 27 MFFI Boiler Heating Gas Valve

Ariston Microgenus 27 MFFI won't shut down?

My Ariston Microgenus 27 MFFI is now six years old and has been serviced every year. Over the last few weeks we have noticed that the boiler does not shut down when desired temperature is reached. Room stat is working fine, but boiler just carries on heating the house until turned off. Whilst it is doing this, none of the temperature lights on the front of the boiler are lit.
Could it be a faulty gas valve? Any suggestions welcome.

Chris Heaton
March 2009

Ariston Ariston Microgenus 27 MFFI Heating, Home Heating Systems Boiler Heating Gas Valve

it's very odd that there's no temp indication lights on when this is happening. if the boiler was being asked to fire up by any source it should still show this! sounds like it could be a faulty PCB. best get an engineer to call

andy gas man
March 2009

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Ariston Microgenus 27 MFFI Boiler Not Shutting Off