CH fine but when HW demanded all cuts out - Worcester 24SBi

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25 Dec 2009
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Surrey
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United Kingdom
First of all, my respects to anyone on this forum today, maybe the kids are getting on your nerves too...

Our Worcester 24SBi, controlled by a Danfoss SET5 controller works fine when heating the central heating system. As soon as we demand hot water (via the controller - ie water heating on), a few clicks and all the flames go out. Switch off the hot water and a few clicks and a slight wumph later, lovely blue flames and central heating carries on as normal. Hot water never gets above tepid. Nobody smelling yet, but reluctant to call a plumber out until Tuesday for obvious reasons.

Pressure is fine, varying between 1 and 2 bar. When topping up system last time (seems to go 'empty' once every six months or so) there is a dripping from an overflow pipe for a while while the pressure drops to 1 bar but this seems unrelated.
 
not sure on thw model but etheir flow switch or diverter valve not working
and orv needs reseting not much u can do till tuesday except ring british gas as the cheep at he mo
 

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