I recently fixed my friends Ravenheat CSI 85 boiler by replacing the CH thermistor. It was fine for a fortnight then it developed a new fault. I think the issue is with the gas valve - but this is an expensive part and I would like some opinions before I buying it.
Call for central heating
Pump runs
Fan runs
Ignitor sparks
Pilot lights for 1 second then goes out
Addition info:-
Pressure at 1.5 bar
Both thermistors at around 20K ohms cold
I have back probed the ignition boards connection to the main gas valve, when the pilot lights the multimeter flicks up to around 80 volts AC. I assume it doesn't reach the full 230 because it is connected and the valve is soaking up the other 150.
To prove my theory about the gas valve I was going to connect the Gas valve directly to the mains and see if I get gas in the combustion chamber. Good idea??
How does the boiler 'know' the pilot is lit, I can't see any thermocouple I read something about a the ignition flame detector but I haven't a clue - can someone explain?
Cheers
Ian
Call for central heating
Pump runs
Fan runs
Ignitor sparks
Pilot lights for 1 second then goes out
Addition info:-
Pressure at 1.5 bar
Both thermistors at around 20K ohms cold
I have back probed the ignition boards connection to the main gas valve, when the pilot lights the multimeter flicks up to around 80 volts AC. I assume it doesn't reach the full 230 because it is connected and the valve is soaking up the other 150.
To prove my theory about the gas valve I was going to connect the Gas valve directly to the mains and see if I get gas in the combustion chamber. Good idea??
How does the boiler 'know' the pilot is lit, I can't see any thermocouple I read something about a the ignition flame detector but I haven't a clue - can someone explain?
Cheers
Ian