[Richard]

I don’t know if you want to tackle my suggestion, but I will put it out there anyhoo. I had similar issues with my AH, an earlier version of your unit, and I retrofitted it with a different control unit. Not suggesting that you do that, but as part of the retrofit I had the occasion to have a good look at the internal wiring of the unit. The wiring that goes to the motor, the flame sensor, and the fuel solenoid. I saw two things which concerned me. One, the wiring was extremely light in gauge. Two, the heat had made it brittle over time. I took the time to a buy high temperature silicone insulated 16g wire, and replace the internal wiring.

I mention this because the culprit you are describing sounds like it could be an intermittent connection. Personally, I would “upgrade” the wiring before did anything else.

Don’t know where you are, but if you are in Florida, I can hook you up into a data logger wired into the system that will tell you EXACTLY what is going on with flame sensor, fuel solenoid, and ignition coil.