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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
i agree

copperpipeman, May 2010
plate heat exchangers r realy difficault 2 clean sounds like yours is still blocked

tim, May 2010
link Click here to see other fixes for Vaillant.