what is problem with this boiler, any ideas?

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It is a potterton prima b. pilot lights fine but when fired up on any setting the burner will cut out shortly after with pilot staying alight. There is also a radiator that has leaked from one of the valve joints, I have corrected this and re-filled.

Anybody wish to share their opinions?
Thanks.
 
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It all depends on what happens next! Does it come back on again after 20 min?

At first sight it would be a failed pump causing the boiler to heat up and go off on its thermostat. So check pump and flow and return temperatures at the boiler.

Tony
 
i dont think it comes back on, it does not heat up enough to go off on thermostat, it cuts out before. i tried on hot water only also and it runs for maybe a minute then burner cuts off.
 
It could have several causes many of which are gas related.

The advice would be to get a registered engineer to diagnose the fault.

First you should be sure the flow pipe does not fully heat up.

What difference does turning the boiler temperature control?

Tony
 
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no noise as such, like i say there was a large leak from a radiator. the burner only stays on for about 40secs on central heating, is that enough time for it to fully heat up?
 

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