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boiler fires up but keeps going off and back on every 3 to 6 seconds?

boiler fires up but keeps going off and then back on every 3 to 6 seconds
mr hadley, September 2008
Or if you have had any electrical work done check mains polarity to boiler is correct.

Hobhead, September 2008
clean the flame sensor, not detecting flame because of dirt?

Andy, September 2008