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The pump was worn. RGI changed the DV as was told that this was the reason the CH part of the system was heating up. I think i'll lift up the boards where these 'funny' pipes are supposed to be and have a look.

Of course. But how would this affect the hot water and CH. Why wasnt this picked up when both the pump and DV were changed. The question isnt about having money set aside but what within the pipework - if this is really the problem, is causing the rads to heat up when the hot water is running.

Its a spacesaver mark II, combi boiler.

The boiler is an old Glow worm II. The hot water and CH both refuse to work independently. Whenever the hot water is on the rads heat up to a stupid temp. The pump has been replaced but no joy although the rads turned off via the thermostat when hot-but not any more. Also the diverter valve...

I'm going to be wiring up a Salus Rf thermostat to a Saunier-Duval combi and need a little clarification. As far as i can see the combi outputs 230v and the Salus receiver accepts 230v by default. The main terminal on the combi has N, L, thermostat, frost stat. there is another terminal with a...

I'm going to be wiring up a Salus Rf thermostat to a Saunier-Duval combi and need a little clarification. As far as i can see the combi outputs 230v and the Salus receiver accepts 230v by default. The main terminal on the combi has N, L, thermostat, frost stat. there is another terminal with a...