We have an ancient Potterton boiler. Our boiler starts as it should, but after 4-5mins, the main burner switches off - pilot stays alight but doesn't re-light main burner. We have replaced the main control PCB (and the external heating control) but to no avail......
Short term fix is turn gas off at iso valve, when pilot goes out, turn back on, should now light.
You probably need a new gas valve which I think is obsolete - if so new boiler time.
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