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We have a pre-1900 semi. Solid walls. I'm thinking about having the side wall insulated externally. Won't do front or back - front would mean it would look 'out of place' in the street, also many windows. Back just too complicated - lots of windows, new extension and porch etc. The side wall...

Thanks to everyone for help. Once new actuator arrived it took me about half an hour to work out which of the existing ones was still passing current and then to change it (awful lot of wires in that wiring centre!). But now seems to working the way it should. I'll wait for the service...

Now that's interesting - because when the engineer called we had another fault with the downstairs rads getting hot when they weren't supposed to. He took the motor off the zone valve and turned the tap back and forth a few times manually, but said he would order a new motor so we will see if...

I have this intermittent problem with my central heating boiler (Potterton Suprima 120). It runs fine and heats water and rads but when all controllers turn off and the boiler should shut down showing only a constant red light sometimes (more times than not) the boiler doesn't shut down and sits...