The heater resistor gets HOT in normal operation, so it's located in the heater fan's airstream.
If the heater fan can't start 'cause of a bad motor, or dirt and debris or ICE in the fan, the resistor would get REALLY hot and start a fire and burn up the poor little Dorf, so they have a couple of "one-time" THERMAL FUSES built into the resistor assembly that blow when it gets excessively hot. cutting the power to the fan motor.
You must have had it on one of the lower speeds when it couldn't start, thereby heating up the resistor and blowing the thermal fuse for the lower speed(s).
If ICE was the problem, replacing the resistor assembly should take care of the problem. If the motor is going bad, or there's debris in the fan area, the new assembly will blow, sooner or later.
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Today's Featured Article - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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