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Had you read my last reply you would have seen that I haven't even seen the boiler, it's at a friends house in another part of the country. Both your attitudes are exactly why I have as little to do with 'professionals' as possible. As it happens, I think it's under warranty and it's going to...

I suspect that you don't know the answer either else you would probably have been more forthcoming. Perhaps there's someone who isn't a smart arse and who knows about this boiler who would like to help? The diverter valve appears so have six wires, is there some kind of feedback that tells...

I'm a Mechanical / Electronic engineer, just not in the heating business. All I need is a little technical information.

The boiler works fine for domestic hot water and the pressure remains at a constant 2 bar. When the Central heating is turned on, the boiled fires up ok briefly but then shuts down. It then goes through a restart sequence 5 times before locking out with the blue light off then flashing...