Both gas and electric modes should cycle on and off depending on the thermostat setting and the temperature inside the refrigerator compartment. It sounds like you have a pretty good idea about what is going on and the fact you get the three spark attempts with lockout due to failure to light, gets the ball down the field at least.
So fridge works fine parked, but not under way even with your own wind shield for the flame. Maybe the flame is weak and barely burns under ideal conditions. Have you had to select cooler settings to get the fridge as cold as it used to be when running on propane?
A couple what ifs:
- I wonder if the spark electrode is still in the correct position to ignite the gas? Flame sensor portion must work or using your torch to light the gas, would not remain burning. Although a small flame might not be hot enough for the flame sensor to confirm ignition.....whereas the torch easily does.
- Perhaps low gas pressure? Other gas appliances working OK?
- Debris in the gas oriface restricting flow? Clean the oriface and burner.
- Gas valve failing to open fully?
- Any changes on the roof near the fridge vent (assume its not in a slide). There have been folks with new taller after market fan vent hoods claiming they interfere with wind currents and fridge air flow when under way.
- Fridge roof vent is not obstructed; clear air flow from side wall vents all the way up to roof vent?
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