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hey vonpit / gcn did you ever find the solution? i have virtually the same problem heating engineer says may be programmer timer...apart from sudden shut down prompted by hw switch off on timer hard to explain other symptoms of cutting out and not responding at other times when hw and ch been...

I think intermittent faults the worst Could it still be sludge or particles bunging up somewhere occasionally On the pump the speed switch can sometimes be round the back and call for a mirror to guide finger Recall I'm a homeowner only non expert [/b]

Katie! :cry: lousey ch an dhw - hell!!! only a few ideas / suggestions from a non-expert - perhaps to quiz a plumber who visits i think yours must be an intermittent blockage problem have you tried upping the speed on pump to max? try feeling the pipes in airing cupboard - you will need to...

ok - i think cracked it the ch has gone off and isnt responding to room stat switch up temp (the hw is off) in the airing cupboard can hear mild whiring noise - i bet ch motorised valve trying to get across but stuck so switched off system isolator switch power went back to ch motorised...

Simond - my thanks :D some stars on here - the power of the internet :lol: my self reasoning after google research initially suspected the ch motorised valve - i could well believe sometimes sticking - but odd how it does that when hw goes off programme instantly the ch goes off too... i...

i guess the heating engineer made recommendation to change timer as that's where he felt fault lies; i suppose without the replacement he guessed reasonable for customer to source and switch.... certainly not a free diagnosis - cost me £85 - !!! :shock: now i feel a bit closer to the truth -...

Hi guys I have a similar problem what a pain this is S plan, vokera boiler, lifestyle lp 241 programmer Hw & ch come on together 6am Hw goes off timer at6:30 Ch should be on all day but instantly also cuts out before room stat satisfied Can bring back on by turning off fused switch beside...