Heat pumps accumulate ice/frost in the heating cycle on the outdoor unit. During the defrost cycle, the ice/frost will melt and water will drain out the bottom. In cold weather applications, you may need a pan heater so the water does not re-freeze into ice. Ice accumulation at the bottom of the outdoor pan can cause issues with fan obstruction and potentially cause coil damage if the ice is allowed to build up underneath coil. In this video, we install an OEM drain pan heater on a Daikin outdoor heat pump unit.
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