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Thanks for the feedback.
As mentioned, the flame sensor is brand new. The previous one that I replaced was spotless after 15-18 years, but I cleaned it anyway with 600 grit and it didn't fix the problem so I just replaced it. Bad flame sensor was my initial thought too.
The pressure switch is tripping when the exhaust fan kicks on, you can visually see it retract. Exhaust fan starts before ignition sequence. Board has no LEDs. Only LED is on the Honeywell gas valve and flashes a system lockout code (5 or 6 flashes, I forget) when the furnace won't stay lit after a few tries.
Will add more info later...it does act like its running out of fuel. I put the unit in new in 2003 or 2005 and it is natural gas.
What sort of voltage am I looking for across the main gas valve and what is this telling me? I'll check that and probably get a manometer on next to check gas pressure.
Thanks~!
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'84 Carrera Coupe
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