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Problem was solved by disconnecting the TRV, placing a tray under the now open end. I then opened the valve at the other end to flush water through and dislodge any gunge that had been stopping the water flowing. Problem solved.

I have a Halstead High Ace which appears to be loosing water pressure. When switched off the boiler water pressure appears to fall to nil. I have then refilled the pressure and switched the boiler on again and it appears to work fine. However when it turns off after a timed program the after...

I didn't try opening the other valve to see if it flows out of the radiator as you suggested, but will try tonight. The flow from the TRV is fine and I have left the top off the TRV to eliminate the risk of that being duff. Would you recommend getting the system pressure flushed...

I tried shutting the other radiators as suggested, but this had no effect. I then disconnected the thermostat valve (the one on the colder side of the radiator) and tested it was working by opening it into a tray... it worked OK and did not appear to be sludged up. I have re attached and tested...

Hi, I hope someone may be able to solve my mystery. I have one cold radiator on a combi boiler system. The other 6 radiators are nice and hot, but this one remains cold. It seems one side of the radiator is slightly warm but the other side (with the thermostat) is cold. I have read various...