Help needed ! My dad has a Baxi WM 40/3 OF . The rads come on when we need hot water only. We only have a complicated installation manual. The dials on the rads don't turn. Don't think they ever did. Under the water tank there is a yellow plastic clip on tag that says heat on / heat off. Around a copper pipe. The valve turns easy when I unclipped the tag, turned to heat off & got hot water only. Result! Until a electrician friend said you must Never Touch a Yellow Tag. It's there to stop you turning the valve. I have googled for a couple of hours and cannot find any image or note about this valve or yellow plastic tags. I've never had central heating. My late mum knew the instructions.
thanks for your reply. I have tried to upload an image but it doesnt seem to work. I have looked for what you described but there isnt anything. I had just hot water on this morning & tested the pipe. The pipe above the valve was hot but below was cold. So I am right in thinking its water in the pipe, not gas ? Is it safe to leave it turned to heat off ? Will it harm the central heating ? Sorry I cant add a photo..
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