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John Cotton

I have a Powermax (thermal store) boiler. When the central heating and hot water is on there is hardly any hot water at all - and when only the hot water is on there is some but its tepid at best. ANY IDEAS ????
 
has this happened over a period of time ?
 
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No , happened all of a sudden. Hot water comes through taps for a few seconds, then goes tepid / cold.
 
does the boiler run ok in just hw mode ?
is the pipes feeding the coil hot ?
has it got a blending valve fitted ?
 
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