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There doesn't appear to be any resistance when I push the lever. As a matter of interest what does this lever do? Does it show the position of the valve or is it a switch or what? On the casing it says "auto" at one end and "manual" at the other end.

Thanks for the replies! Yes, namsag, there is a Honeywell motorised valve as you describe - next to the pump in the airing cupboard where the hot water tank is. Is there any way I (a complete amateur remember) could check if what you describe is happening? This seems to match exactly the...

Sorry if similar question has been asked elsewhere - I have searched and can't find anything matching my problem. My central heating system has been working fine for years and years but recently the heating seems to stop after its been on for a couple of hours. The pump seems to stop (I...