Keeprite NG furnace code "fail to ignite"

Ok, good info.

From what I can find, any of these can cause that alarm:
* Gas is shut-off.
* PCB not sending 24 VAC to gas valve.
* Bad gas valve.

The pressure switch is before the HSI in the Sequence of Operation, so if that didn't make, your HSI wouldn't light-up. So you're good there.

I had to download the Kenmore manual to find this info (it's not in the Keeprite Manuals, for some stupid reason), but you can find it here:

https://www.questargas.com/ForEmplo...H9MVX-T9MVX-C9MPV-T9MPV-C9MPT-H9MPT-T9MPT.pdf
See pages 50-52.

So back to Square One. Is the gas "on", and if so, is the gas valve receiving 24 VAC on the MV terminal 17 seconds after the HSI warms-up?

And just an FYI, when the gas valve does energize, you'll hear it, if you're listening for it. You can also feel it, but it's light.