Combi Boiler- variable water temperature


Postby rdelisle » Tue Jun 26, 2007 8:24 pm

Hot water changes temperature from hot to warm and back to hot etc.
Is there a common cause please?
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Postby toneyt » Wed Jun 27, 2007 6:53 pm

sounds like scaled heat exchanger,what boiler is it?
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Postby rdelisle » Fri Jun 29, 2007 6:20 pm

Hi, its a Baxi Combi 80e
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Postby toneyt » Sat Jun 30, 2007 4:10 pm

commonly the domestic heat exchanger will scale up/block does the boiler fire up then off ,cycling on and off as this can indicate the boiler reaches temp internally then cuts as it senses too much heat,but the water temperature is moderate,
secondly check too see if the central heating pipes heat up at the bottom of the boiler as this could be the diverter valve letting by,in this case the boiler would remain on and not cycle on/off
T
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Postby rdelisle » Tue Jul 03, 2007 2:23 pm

Thanks very much. Where would I go for info on descaling. The Boiler Manual is curiously silent on problem solving.
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Postby toneyt » Tue Jul 03, 2007 5:01 pm

i wouldnt bother descaling get a new one and fit a scale reducer to help slow the problem down for the future
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Postby rdelisle » Wed Jul 04, 2007 12:16 am

OK.
Thanks for all your help.
Much appreciated.
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