Applicable Systems
Carrier Transicold Refrigeration Unit
Symptoms
The Carrier Transicold unit displays alarm CR012, indicating temperature sensor drift. A discharge or space temperature sensor is reading outside its calibrated range, causing inaccurate temperature control.
Possible Causes
- Sensor element has drifted from calibration due to age and thermal cycling
- Sensor wiring has developed high resistance from a loose connection or corrosion
- Controller input channel has drifted and requires recalibration against a reference source
Troubleshooting Steps
- Step 1: Compare the sensor reading to a calibrated reference thermometer at the same location
Sensor reading matches the reference within 1C, confirming the sensor is accurate - Step 2: Check the sensor wiring resistance and the connection tightness at the sensor and controller terminals
Wiring resistance is negligible and all connections are tight with no corrosion - Step 3: Perform a controller input channel calibration using the calibration procedure in the manual
Controller input reads correctly after calibration, matching the reference signal
How to Reset
To reset: 1) Replace the drifted sensor with a new calibrated unit. 2) Repair wiring and connections. 3) Recalibrate the controller input channel. 4) Press RESET and verify temperature control is accurate.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: Carrier Transicold Refrigeration Unit Manual, Carrier Corporation
Category: Refrigeration
No comments yet. Be the first to share your experience!