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Its looking like its a problem with the actuator on the new valve. He can get the hot water working by bypassing something or other, its just the central heating part thats not working now. Apparently the whole system did work for about 20 minutes after they fitted the new valve last week...

Guy came back this morning, first thing he did was to disconnect the valve and it still tripped. Im assuming hes going to be testing each of the different parts the same way to track down the problem. I spoke to a few people who he has done work for and Im a lot more confident in his ability...

The yellow/green cable is from the water tank thermostat, the other wires coming from the same cable are the blue and brown wires on the far right of the same block.

One goes to the water pump, the other to the thermostat on the hot water tank.

Exactly the point Im trying to make to my wife, the problem is 100% reproducable. I dont for one minute believe the only way we can find out whats wrong is to start pulling floors up.

A couple more ..

Sorry about the quality, the black cable leads to the new valve, it all makes no sense to me.

I wasnt here at the time but according to my wife he tested it all and couldnt find anything wrong. Im no electrician but I would have thought if there was any kind of fault in the wiring then he should be able to find something??

Well the original problem was that the radiators were heating up when the hot water was on (central heating off). The solenoid part of the three way valve had previously failed and been replaced, it was assumed that it was the other remaining part that had failed this time. It would have been...

Plumber and electrician came round to replace our three way valve on Thursday. When they went to turn back on the central heating at the fused switch in the kitchen the RCD tripped. They said it could be water in the wiring somewhere as they didnt drain the system first despite them putting a...