Lennox · Air Conditioning
The temperature sensor (TP) for the compressor discharge line is either not connected (open circuit) or has a short circuit. This prevents accurate temperature readings.
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Inspect the wiring of the compressor discharge temperature sensor for breaks or shorts.
Verify the sensor's connections at both the sensor and the main control board.
Test the sensor's resistance and continuity as per the manual's guidelines.
Replace the sensor or repair wiring if a fault is found.