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It sounds like you just have a bad switch. Unplug the control from the switch. If it still keeps running, you have some kind of short in the system.
 

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The switch is connected via umbilical to a resistor in the front side of your heater box. Remove the umbilical. If the heater motor quits running then your short is in the switch or umbilical. Report results of unplugging the umbilical from the resistor.
 
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