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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...

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...