vokera combi

18 Dec 2003
Reaction score
United Kingdom
boiler is combi vokera 20/80 rs flowmatic , the ch is working fine but there is no hot water. when hw is drawn from tap its is hot then turns cold within seconds boiler doesn't fire up .if i override the microswitch the boiler fires is this problem probably due toa faulty diverter valve,diaphram etc

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Overheat stat chops the pilot on this boiler. Nothing works with pilot off
thanks for the quick response ,what is the best way of checking the over heat stat is faulty
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Faulty overheat stat means you have no pilot. No pilot means no burner therefore no HW or CH.
hi dp, cheers for the post, the ch is working its just the hw thats not
Doesn't sound like overheat stat problem to me, more likely dhw diaphragm located in water valve or microswitches. If hot water flow is poor try increasing it using flow regulator on water valve.

reason for short amount of hot water could be residual heat left in heat ex where ch has been on or even just pilot light.
hi galwag, thanks for the post i think it is a diaphram prob but all the help is greatly recieved

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