Trane | AC and Heat Pump

Error Code Amber LED (Fast Flash)

Troubleshooting guide for the Trane AC and Heat Pump system fault Amber LED (Fast Flash).

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

Communication loss detected.

Potential Causes & Solutions

  • The outdoor unit has lost contact with another component on the network (e.g.
  • thermostat or indoor unit).
  • If it doesn’t restore in a few minutes, check communication wiring and power to all devices.

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