vaillant 837 ecomax hot water temp fluctuating

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Hi all, have been having problems with the hot water temp fluctuating have checked DV and dose not seem to be letting by and heating is ok , can anyone help??
 
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These models suffer big time with blocked rubber hose goin up to main ht exch give it a squeeze! If it's rock solid order a new one don't try an clean it they always leak afterwards ! When u look through it u will be amazed it everworked at all
this causes the hot water prob u usually find boiler fires ok then just gradually dies to low rate gas an the temp gauge goes lower an lower , it doesn't show any fault codes
 
These models suffer big time with blocked rubber hose goin up to main ht exch give it a squeeze! If it's rock solid order a new one don't try an clean it they always leak afterwards ! When u look through it u will be amazed it everworked at all
this causes the hot water prob u usually find boiler fires ok then just gradually dies to low rate gas an the temp gauge goes lower an lower , it doesn't show any fault codes


the temp fluctuates hot and cold and sorry its a turbomax not a ecomax
 

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