, my name is ***** ***** I have been in the home improvement and repair field years. I will be very glad to help you today. Does the boiler operate otherwise? Is there no other fault and no error code?
no other fault, just the fan runs continuously , boiler does not fire.
It is most likely a faulty PCB. Are you going to repair yourself or just getting an idea before calling someone out?
just an idea before calling someone out
I see. It is almost certainly the Printed Circuit Board. The board being the brain of the controls has not closed the circuit to the power fan. It may also be that the flow sensor is an open circuit. The flow sensor can be tested with a volt meter and also the circuit board to determine which it is.
thank you very much, you have been a great help
You are very welcome. I am very glad to help. You can try to turn the power off minutes and then back on. It is unlikely to work but worth a shot.