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Hello Namsag, well done and thank you - almost bob on with your suggestion to look for leaks from or around the motorised valve. The MV was fine but the boiler mounted thermocouple and thermostat had been attacked so to speak by dripping water from the joint of a small cylinder above...

The boiler is a Potterton Profile 50e. The paperwork / owner's manual is available so I guess I just start isolating different bits one by one until advancing the hot water does not cause the electric to trip out. Could it be anything to do with the controller - a Honywell ST1000 I...

Potterton but I don't yet know the model. There must come a point when disconnecting things in sequence for sure will allow the advance the hot water switching action to NOT cause the electric to trip out but this may still not clearly show the fault - can you suggest a little more that I...

The hot water function of the heating in my daughter's 8yr old house was working fine until a couple of days ago although she had noticed a couple of months ago that the upstairs heating was not so good. With summer coming she stopped using the heating and only fired up the hot water a couple...