[bstark]

Mike: the thermal fuse referred to is the small dime sized item with a couple of wires that is fastened to the outside of the boiler chimney and is there to detect a higher than normal temperature within the insulation pack around the boiler itself which usually indicates a leak of ammonia from brine and subsequent flaring of flame from burner and yes, this would necessitate a replacement coling unit or fridge itself. It is also intended to detect a propane malfunction resulting in a flame occurring before the ventury tube. That would also be detected by a lack of flame in front of the flame sensor at the ignitor end.

The function of the sensor is to inhibit power to the propane solenoid valve, shutting off the burner if a drastic rise in temp is detected.

They are talking about a baffle and the only one that is in the chimney itself is the one in the very top of the chimney and could only dislodge if it's retaining spring wire were to break or rust through.

The rest of the shielding around the boiler/burner housing is merely there to prevent wind gusts from constantly blowing out the flame. While stationary the fridge will operate without any of this stuff for troubleshooting purposes; NOT IN NORMAL useage however.

I'm having difficulty in determining what "baffle" could have become dislodged so as to raise the stack temps within the boiler chimney itself. Perhaps something covered the top of the chimney like a stray piece of fiberglass insualtion falling down from the very top of the cabinet but that would be rare ineed.

It takes quite a bit of added sheet metal to inhibit the air flow around that boiler enough to raise internal chimney heat enough to trigger that sensor as the Dometic recall of "flame containment" sheeting added to many fridges basicly closed the entire thing off completely other than a small air inlet area at the propane jet housing itself.

Keep us posted with ongoing assessments & repairs by tech's; this stuff is interesting.