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Mend Chaffoteaux Combi Boiler Switch Central Heating

Which thremostate has gone?

I have a Sterlinig PP combi boiler (Chaffoteaux et Maury) and it sipply will not switch off when on the central heating side. When I turn the hot water tap on it's red hot straight away but as soon as I turn the hot tap off the boiler carry's on working even with the room stat on zero. The only way I can turn it off is simply switch the boiler off.

Dave Tippett.
November 2007
Solved the problem, the micro switch's had failed so I changed them and the boiler is working fine now. Thanks for the reply's.

Dave Tippett
December 2007
diverter valve is stuck

craig, plymouth
December 2007

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Mend Heating, Home Heating Systems
Mend repair fix Chaffoteaux home heating systems