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The fan blade should snap onto a pin at the base of the shaft. Step 6 Step 7 2-2 203 SCR-6/8 2-5. THERMAL SENSOR REPLACEMENT 1. Remove electrical power to unit. To avoid electrical shock or property damage, move the power switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 2. Remove the side panel closest to the controls. Step 2 3. Unplug probe from control PC board. 4. Press down on the probe bracket and pull probe from bracket, or using 3/8" socket, remove nut