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British Gas 330 Doesn't Modulate

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  • British Gas 330 Doesn't Modulate

    I'm looking at a British Gas 330 boiler which is made by Glow-worm. It constantly cycles between flat out to off, rather than modulating. I though it might me a blockage somewhere in the system which wasn't letting the hot water get away and the boiler going into Over Heat shut down. I flushed the system but found no sludge and the pump is working well. The flow temperature never gets above 60 deg C. Essentially the boiler heats the house, but it must be horribly inefficient. Any ideas?