System Diagnosis
Ambient (outdoor) temperature sensor fault (open or short circuit).
Trane | AC and Heat Pump
Error Code Red 5 Flashes
Troubleshooting guide for the Trane AC and Heat Pump system fault Red 5 Flashes.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
Potential Causes & Solutions
- Locate the ambient sensor on the outdoor unit and check its wiring.
- If wiring is intact but the code persists, the sensor likely needs replacement.
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