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Yesterday I drained my CH to replace a leaking drain cock beneath a radiator, all went OK until I came to get it running, Cyl stat calls for heat and boiler/pump work, but as soon as I put the room stat up to call for heat the boiler cuts out leaving pump running. Checking volts at the wiring...

I have bought a 22mm compression fitting mid position diverter valve to replace the faulty one on my system, but want to be sure about the task before I start to do the job (it is winter after all!). In the past when replacing compression fittings I have sometimes found that the olive has cut...