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Vokera Compact 25he Cuts out on heating?

Discuss Vokera Compact 25he Cuts out on heating? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Kewat66

Gas Engineer
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Hi All,
i have vokera compact 25 that was not working at all. Had a good look at it and it ran with the cover off but not on. Diagnosed it as a Venturi. Replaced this and thought problem solved. Now the boiler works great on DHW but lights for about 10 seconds, then stops for 3 minutes, then lights & so on.
the pump seems to be working as I have checked this with magnetic wheel so it doesn't look like the pump.
temp remains the same on flow and return though?
vokera technical said there is a blockage on the system but boiler looks fine? From cold the boiler runs for about 3-5 mins then goes back into this cycle?
Surely if there was a blockage it wouldn't run from cold for a few minutes? Can the pump look as if it is running but actually not be?
any ideas on what I am missing?

thanks
kewat66
 
if it works on hot water but cuts out on heating that rules the pump out
 
check the min settings could be it runs in hw as its full flame most of the time but heating cuts out when flame modulates down
 
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