Removal and replacement of the outdoor coil thermistor that is not accurately sensing temperature. The failed thermistor prevents proper defrost operation, allowing the outdoor condenser coil to freeze. Replacing the thermistor restores correct temperature sensing and proper system operation. 1-8-2025 Removed the unit housing and replaced the compressor thermistor and thermistor assembly. After reassembling, the unit was powered on and operating temperatures were verified to be within specifications. The unit was allowed to run to observe a defrost cycle, which initiated and completed successfully. At this time, the unit is operating properly with no further issues observed.
