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I had a guy out to have a look today and there were 2 distinct problems: - when HW was on to heat the storage cylinder the pump wasn't working (was stuck) so that was quick to fix - when CH was on at timeclock the relay between wiring centre and boiler was clicking on/off repeatedly -...

Yupe, its a S Plan layout - there are 2 motorised values below the boiler - even when I managed to get the boiler to fire and stay running (by running the tap in the kitchen) and then turned on the hot water and/or central heating on the timeclock I didn't feel any heat in the pipe leading...

Yupe As far as I can tell the timeclock has 2 wires to signal for storage cylinder heating and for central heating, these wires then go into a wiring centre (i.e. patch panel) and then go to the relay which then goes to the boiler. So the timeclock drives the relay which drives the boiler...

I have a ICI Caldaie Solar I 20 SE comvi boiler here, it was fitted when the house was built 10+ years ago. It provides hot water on demand to taps in kitchen and utility room. Hot water for all other rooms is via a hot water cylinder heated via timeclock. On Saturday I found there was no...