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In the diagram, where I've put a red line across the line, those wires were sleeved in red. Would that be the permanent live?

Ok, thanks. I'll try that, however, what do I do with the red that is already in COM on the top part of the switch?

Yep, always had the blacks in the terminal block. I think all the switches in the house are like that. Thanks for all your help!

What is actually in there is one 3 core, and three 2 core (red and black), but all the blacks are on a single terminator block.

The red of the 3 core is actually going into the lower COM.(odd, right?) No light fittings have been changed, only the switch.

Sorry forgot to put that in the diagram, they've been made redundant by placing them into individual terminate blocks. The blue, the yellow and the red(com) of that set.

Hi there, There are 4 lights which are relevant to this problem, and one of them (LIGHT A) was on a 2 way circuit. I have changed a 2 gang switch (labelled SWITCH B) to a dimmer switch which is 1 gang only (labelled SWITCH C) and made the changes on the diagram. I reckon SWITCH A was wired...

hi there thanks for the replies. it was the pcb!

In case this is useful to anyone else, I've just opened the panel, and on turning the unit off and then on again, I can here the sound loud and clear. I have detached the timer board and it is definitely that item which is making the sound (its very hot and vibrates badly). I suspect that is...

Thanks for the reply, it does sound like it's coming from the back of the panel. How would I go about disconnecting the thermostat (sorry I'm green to plumbing lol). Thanks again.

Thanks for the reply. Tried what you suggested, but nothing happened. Pump still quiet, but I can still hear the one next to it spinning, it is labelled "primary return to heat generator". I'm just thinking though, would the pump spin if the control system does not think the CH should be on...

Hi there, Everything has been working fine, bar the odd buzzing noise, kettle noise or banging noise from the heating system up until now. Turned the CH off, using the winter/summer setting about 2 months ago, and now put it back to winter, and well nothing. The thing doesn't do anything...