Keeprite NG furnace code "fail to ignite"
The sequence, depending on the type of furncace:
1...Call for heat activates the control board/ ignition module, certain safety switches must be closed, AKA over temp, plugged vent, vent spill, etc.
2...Module fires up draft blower for a certain time, then commands igniter to come on. It is timed for so many seconds, and you should hear a "click" when the gas valve opens.
3...When the gas valve is commanded open, the burner should ignite. There is several seconds delay to allow the burner to stabilize, and to obtain a flame signal
It all depends on the furnace manufacturer and the Specs they gave the PCB supplier, but for the most part, this a good, rough approximation.
Your HSI is working fine, but I don't think the gas valve is getting energized (I don't hear it).
To the OP: Are you comfortable with a VOM, and/or do you know how to measure AC volts?
The Sequence of Operation above is a good start, but it's missing the pressure switches. On some models, the switch (or switches) has to make within a certain period of time, while on others it has to make,
and then break, within a certain period of time. And if any of this doesn't happen correctly, the gas valve will never be energized, so....Would you be comfortable measuring the voltage on the gas valve as it tries to start? (24 VAC, nominal)
My point being, w/o the model and S/N of the unit, all anyone here can do is guess, but I've worked Technical Support long enough to know that the same board can have different programming in it, depending on the manufacturer.
If you can post a picture of the M/N and S/N of the furnace, as well as the numbers off the PCB, I can dig-up the schematics, Sequence of Operation, and the Fault Codes, and we can work through this step-by-step. This is what I've done for a living for 30+ years, and I'm in the office right now.
(Or, what the hell! Give me a call at the office. Shoot me a PM for the number, if you think it will help. But I'll still need the info off the furnace.)
I may not be worth a damn on Mopars, but this "stuff" is right up my alley.
Jim
