Baxi Combi 133 HE plus - hot water, no heating

Joined
1 Mar 2011
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Cardiff
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United Kingdom
My Baxi 133 HE plus boiler fires up for hot water but not heating, even though the Drayton Digistat thermostat is evidently sending the info to the receiver i.e. green light on receiver is lit. This is an intermittent problem as the heating does work occasionally. What could be the problem? Any suggestions? :)
 
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Flow switch,pump,diverter valve,faulty wireless receiver,could be any of those and maybe others that I've forgotten.Not good boiler for diy.If you have the manual and a multimeter and the skill there are a few things to check.Is your system pressure above 1bar when cold? Does pump run etc.
 

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