P12000
Carrier Transicold
Warning
C3 Chk Supply Air Sensor
Pre-Trip failure in the supply air sensor of compartment 3.
Possible causes
- Inconsistent reading during self-test
- Sensor out of calibration
- High resistance in the wiring
Recommended actions
- Perform manual sensor diagnostics
- Verify sensor is not obstructed by cargo
- Measure wiring harness continuity
- Replace sensor if Pre-Trip fails repeatedly
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