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    Glowworm boiler - keeps tripping showing F5, F9 or F11

    I have a Glow worm Ultrapower sxi boiler. Over the past 24 hours, it has kept stopping and showing fault code F5, F9 or F11. If I then reset it via the reset button, it starts working again for a short period (and will heat water in that period, eg I've had a hot shower, or the central heating...
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