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Many thanks for the swift reply. By C do you mean a C6 or a C16 (if there is such a thing) for the lights? The new board was fitted by another spark friend of the same friend a while back, so he was the originator of the 16 amp ring socket MCB's. May explains why he was always coy when I...

Some of TRV's will be 10 or even 20 + yera old. But I assume if they were uni-directional those radiators would not heat up very much at all? Many thanks for the quick and helpful reply. It has saved me changing them. I will continue my search elsewhere for the gremlins in my CH system.

The RCB's on the light circuits tripped every time a light bulb failed. The RCB's for the 13 amp sockets tripped when too many applainces were switched on (eg:- w/mach, d/washer, kettel and TV/video etc in living room all together on same loop). Cooker/shower/alarm etc each have their own...

I think half my TRV’s have been fitted to the return end of my radiators in error. Before I change them can anyone confirm: - 1. Does the flow valve pipe always heat up several minutes before the return pipe and is this a reliable way to identify the flow pipe (rather than costly lifting...