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    ELM LeBlanc GVM boiler not retaining water pressure

    I have an ELM Leblanc combi gas boiler (approx 12 years old). After returning from a couple of days away I noticed that the pressure gauge was at zero. I topped it up to 1.5bar and switched on the heating. The heating runs fine, but the gauge just drops back to zero after topping up. I'm...
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