OK, I think I found the culprit. When I climbed in the attack, I found the main vent disconnected. See photo. I also attached a drawing of the installed orientation from the manual. I also found screws on the floor. A few years ago, the fan unit had to be replaced. I think when that happened, the repairperson only shoved the vent tube back into position and didn't screw it back in, and then over time the natural expansion and contraction loosened it.
My wife kicked on the heater while I was in there and I observed the red light sequence. I THINK the short blips were 3 (might be 2) and the long one was definitely 1. I did actually hear the ignition "Phoomp" and I smelled gas. However, with the vent off like that, I got nervous when I smelled the gas and had my wife shut it off rather than run it again.
The error codes on the panel are:
31 (I think it's this one) - Pressure, Draft Safeguard, Aux-Limit Switch or Blocked Vent Switch did not close or reopened (downflow).
Check for: Proper vent sizing, low inducer voltage, defective inducer motor, defective power motor or capacitor, restricted vent, defective pressure switch, excessive wind, inadequate combustion air supply, disconnected or obstructed pressure tubing
21 - Gas Heating Lockout.
Control will NOT auto reset. Check for mis-wired gas valve, defective control (valve relay)
Based on all this information, does it seem logical that it's just the disconnected vent or might there be some other issue? I didn't want to connect it myself without knowing if I might be jarring some sensitive equipment or something. I tried for a few minutes but the pipe was being stubborn for a good fit. Thanks!
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