Trane | AC and Heat Pump

Error Code Red 13 Flashes

Troubleshooting guide for the Trane AC and Heat Pump system fault Red 13 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.

System Diagnosis

External outdoor temperature sensor fault (open/shorted).

Potential Causes & Solutions

  • If an auxiliary outdoor sensor is installed, check its wiring.
  • Replace the sensor if needed.
  • If no separate sensor exists, a technician should examine the control board.

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