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    Boiler won't go off once ignited (until overheat cutoff)

    Once ignited, the boiler (Tricom ProTherm 40-50 CI, 4 years old) in my vented system will not go off, causing it to eventually trigger the overheat cutoff (and much noise from my pump and pipework due to the insanely hot water inside). I understand that a properly functioning boiler will...
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    Boiler Problem - Needs Diagnosis

    THE CONCISE VERSION FIRST Why would a ProTherm 40-50 CI boiler only come on when the thermostat knob on the front is at 0 and go off when I turn it round to anything higher? With it set at 0, it never shuts down and consequently overheats. The knob used to be set at MAX permanently, but...
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