When the resistor fails it creates an open (higher resistance) path thus drawing less current (low or no fan operation). You normally would not suspect a blown resistor when looking for an over current condition. It is more likely damaged insulation (caused by heat from the failed resistor) or a bad fan motor or switch. He did state that it â??only worked on high since he got itâ? This would indicate a failed resistor but would not cause the new blown fuse condition.
jeff
