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i am sorry if this sounds dumb - it's friday night! how would this be used in practical terms though if you don't mind me asking? :cry:

thanks for that explanation i get it - but just had a long day ! i was always told - if power is going to the solenoid but it's not working then it;s faulty (i always checked solenoid coil too on resistance)!

sorry my mistake - the leads are removed, power off and coil resistance read - one of those days!

of course! so what exactly is a NEUTRAL FAULT? is it where a neutral wire/connector is loose??

sounds like pcb is faulty ! but need it checked confiremed etc

i agreer there the flow is probably too much to heat the water enough could be as mentioned above, dhw themristor, gas valve settings, flow rate too high, etc what combi is it?

thanks for your reply if the coil has gone open circuit though - across live and neutral it would not give 240v would it ? as the coil would stop the voltage going back to the neutral?

Just a quick one: I have read that if a multiu funtction gas valve (main solenoid) has power to it (and it doesn't work then it's faulty) - Me I would check the resistance of the coil too - open circuit def. faulty... I have just heard today that it's best to check across live and neutral...