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no heating or hot water?

I have a Grant 70v3 when i ask for heating or hot water the burner wont ignite, not lock out, plenty of oil. when i ask for heating the circulation pump runs but burner still doesn't start. i have been advised possible pcb, but cant look at it yet.

Thankyou
John, July 2008
maybe high limit manual reset thermostat.

Norman Burgess., August 2008