You can bench test the POF snap disc with a BBQ lighter and ohm meter.
After heating up the snap disc you should heat it click and then settle down to approx zero ohms or short circuit if it reads 03 ohms or higher, it may not trigger the control board properly to put the stove in run mode and the auger will stop turning and the fire will die out.
You can also use dielectric grease on the wire connections and thermal paste on the flange with the screw holds. Clean and remove any gasket material or paint that will hinder the heat transfer from the exhaust housing to the snap disc,

