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I recently repressurised my pressure vessel as the boiler was not firing. Now the boiler works fine and so do my downstairs radiators but upstairs are stone cold. I have bled all the upstairs radiators but no improvement. I have tried switching off all the downstairs radiators to try and force...

Hi. My boiler has an intermittent problem. Sometimes it will not start and when it does it sometimes switches itself off after a couple of hours. When the problem arises the boiler will hum but the pump and the fan will not kick in. The boiler is also losing pressure and the pressure rises...