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back boiler not flaring up on potterton housewarmer 54 back boiler?

my back boiler ignites the pilot light but the boiler doesnt flare up. Pilot light still stays on as if all working.
jan, March 2013
Is timer on ,room start on ,is live power on gas valve if yes change gas valve if no power on gas valve than faulty control could be timer or motorize valve

ltd, March 2013
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