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Yes, HRM direct seems to be my best bet. I will call them Monday morning.

Thanks for your reply. I assume you mean twist the plastic knob with 3 bar printed on it. I have done this many times. I have even given the valve a few swift taps with a hammer in the hope of freeing it. The original problem was lockout due to overheating - air in the system. I intend to...

When I attempt to repressurise the system water pours out of the overflow pipe outside. I think that this can only be a faulty pressure relief valve that is stuck open. Can anyone confirm this, or have other ideas? Also can anyone recommend where I can get one of these valves. I tried the local...