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    Combi boiler, increase in preasure when heating is on.

    Hello, I have a Main eco 30 combi 9yrs old. when the heating is on the pressure rises up to 3.5 or more, then the prv opens, when the heating is off the pressure is way down and the boiler fails to light. I have refilled it several times and bled the rads, there are no leaks on the pipework...
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