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Mend Vaillant 824 Water Boiler

vaillant 824 water temp goes up then down?

hi all i have a turbomx 824 boiler the water temp has been fluctuating up and down so after alot of reading i decided to change the diverter valve i also gave the heat exchanger a good clean out but i still have the same symptoms! any ideas
cheers

daz
May 2010

Vaillant Vaillant 824 Heating, Home Heating Systems Vaillant Water Boiler

i agree

copperpipeman
May 2010

plate heat exchangers r realy difficault 2 clean sounds like yours is still blocked

tim
May 2010

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Vaillant 824 Boiler: Fluctuating Water Temp