How to De-Ice a Window Air Conditioner

Adjust the thermostat higher to a warmer setting and adjust the air conditioner fan speed to high to expedite the defrosting process. These settings allow the unit to thaw quicker than simply turning the unit off and waiting.

Unplug the window unit air conditioner or switch the air conditioner circuit breaker to the “Off” position to shut off the flow of electricity to the air conditioner. Remove the fan-housing panel from the front of the window unit air conditioner to access the fan housing and set it to the side. Pull all debris, such as sticks or plastics bags, from the fan housing area. Debris blocks the fan blades from spinning and causes the unit to freeze. Move the fan blades around to confirm that they are now free of debris. Remount the fan-housing panel, turn the circuit breaker back on, and allow the unit to defrost.

Turn off the air conditioner circuit breaker, if necessary. Swing the fan blades around manually to test for resistance at the axle ball bearings. If the fan blades exhibit resistance, the ball bearings might be dry and in need of lubrication. If the fan is unable to operate uninhibited, the cooling element freezes. Pour electric motor oil into the ball bearing lubrication holes and turn the fan blades to work the oil in between the bearings.