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halstead finest gold combi boiler keeps firing up then going out then fires?

The combi boiler fires up then shuts down then fires up and the pattern continues. This means we can't get hot water for long before it goes cold then goes warm etc.

DH
December 2009
HalsteadHeating, Home Heating SystemsHalstead Combi Boiler Going
boiler combi heats upstairs not down any answers please

darren critchell
December 2009
Thank you I will have a look.

DH
December 2009
possible cause plate DHW exchanger full of sludge if there is one in the boiler and will need to flush

Mr K
December 2009
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