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We have an old glow worm 100f boiler.yes I know we should put a new one in, and perhaps we will next year...when boiler is switched on by time clock, we see the pilot light ignite, the pump come on, but the main burner does not light.When you bang the case the burner ignites and in 30 mins we have some hot water.We have had it serviced recently and they said it was clean and in good condition. they have been unable to fix the problem described above. One company has suggested it needs a new thermostat. this is now obsolete but you can still find them. But is it the thermostat ? why does the pilot light ignite ? when I bang it, surely i'm just making a dodgy relay make contact?Can any one advise?