In an earlier contribution to this discussion,
altheman alan@ford50(no spam).freeserve.co.uk wrote:

hi again,
i have now read your advice......i have now switched on "hot water"
only...and the pump fires up.....i then switched off hot water...and
just switched on central heating.....again the pump fired up.....so i
am now guessing that both switches work independantly of each
other...so it is safe to just switch on central heating on its own
without having to switch on hot water also...would that be
right?....many thanks yet again in advance

But you haven't told us whether the *boiler* fired up. Did it? The pump on
its own will just circulate cold water - which is a complete waste of time!

If the pump runs in HW only mode, it suggests that you've got a fully pumped
system. Have you got any motorised valves anywhere - maybe in the airing
cupboard? Is there a thermostat strapped round the hot water cylinder (not
the one in an immersion heater)? How many water pipes connect to the back
boiler behind the gas fire?
--
Cheers,
Set Square
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