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No, I checked and I don't have a zone valve. Also, the central heating pump in the airing cupboad started making a slight whirring noise earlier, so I've asked British Gas to come check it and they're coming tomorrow. The guy I spoke to on the telephone said it sounds like the pump is/was...

Hi, I have a gas boiler that's regularly serviced by British Gas and was checked only a couple of months ago. That's working fine and my upstairs radiators are also working fine. However all of my downstairs radiators are stone cold this a.m. I've tried air-bleeding them with an allen key...