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Hi folks. I wonder if anyone here can make a suggestion what to try next. I posted a while back about a faulty mainboard in my Gloworm Ultimate fan assisted boiler (about 12 years old). Following advice, I got an engineer in who decided that it was indeed the board and bought me a new one...

My glowworm has developed an annoying fault. When it cycles off for the thermostat, or overnight, it won't light automatically. However, a very gentle tap on the switch housing brings it back to life. (I really do mean a gentle tap - not a big 'ommer). Any idea what it might be. Don't...