I'm new to this forum so hello everyone. I need your guys help to figure out where the problem is.
When I turn the boiler on the first check is correct and one of 4 neons is on. I turn on the thermostate on and the second neon is on. The fan goes on, pressure check etc. and the third neon is on. And then the ignition spark starts every few seconds but no flame shows up. I was told by one of the engineers to replace pcb. Which I did and still the same. I checked the voltage with manual and there are 3 cables coming out from pcb into the solenoid gas valve. Blue which is 0 voltage which is correct as minus. Brown to the main solenoid which has 240, and black to the starter solenoid for ignition pilot pipe and shows 0. I tried to track the voltage before it comes out from pcb and everything seems to be fine. The wire that connects at same point on pcb is connected to air pressure controller which looks fine and the voltage is at 240. I fitted brand new pcb so it can't be this. Is there something that pcb would cut off the voltage off from black wire to avoid gas release and start the ignition ?? Can you please help? Any ideas ?
When I turn the boiler on the first check is correct and one of 4 neons is on. I turn on the thermostate on and the second neon is on. The fan goes on, pressure check etc. and the third neon is on. And then the ignition spark starts every few seconds but no flame shows up. I was told by one of the engineers to replace pcb. Which I did and still the same. I checked the voltage with manual and there are 3 cables coming out from pcb into the solenoid gas valve. Blue which is 0 voltage which is correct as minus. Brown to the main solenoid which has 240, and black to the starter solenoid for ignition pilot pipe and shows 0. I tried to track the voltage before it comes out from pcb and everything seems to be fine. The wire that connects at same point on pcb is connected to air pressure controller which looks fine and the voltage is at 240. I fitted brand new pcb so it can't be this. Is there something that pcb would cut off the voltage off from black wire to avoid gas release and start the ignition ?? Can you please help? Any ideas ?