I've noticed recently that every so often, when the timer switches on the central heating, the boiler fails to ignite. I take the cover off and the flame isn't lit but sounds as though it is trying. I then switch boiler off and back on again and it ignites no problem! This only happens sometimes. For example, this morning it came on no problem, but tonight it didn't. What could be wrong? I'm going away for a few days and don't want any problems with it while I'm away.
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