F6
Trane Compressor Current Sensor / Inverter Protection Fault

Trane air conditioner displays F6 and may not modulate capacity correctly on variable-speed or inverter models.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Faulty current sensor, Loose power connections to inverter, Inverter module failure, Shorted compressor winding

How to Fix / Troubleshooting

Safety first: This fault involves high-voltage inverter electronics. Turn off power at the main breaker and do not touch inverter components unless you are qualified.

  • Visual inspection: Look for burnt marks, swollen capacitors, or melted wiring on the inverter module and power connections.
  • Tighten lugs: With power off, check that all line and load lugs on the inverter and contactor are tight.
  • Power reset: Leave power off for 10 minutes to allow the inverter to discharge, then restore and test.

F6 faults typically require a Trane technician to test the inverter, current sensor, and compressor. Do not attempt component-level repair without proper training.

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Repair Difficulty

Professional Required 5/5

Required Part

Trane Inverter Module
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