Error Code Guide
Trane Furnace & AC Error Codes
Trane furnaces also use a blinking red LED light to communicate error codes. Count the flashes to determine the code.
Common Trane Issues
- Pressure switch faults
- Blower motor wear
- Dirty flame sensors
Diagnostic Error Codes
System Lockout (No Flame)
Call a ProThe furnace tried to light but couldn't detect a flame. The flame sensor likely needs to be cleaned, or the gas valve is failing to open.
Pressure Switch Error
Call a ProThe pressure switch is open. Check the PVC exhaust pipe outside to make sure it isn't blocked by snow or debris. If it's clear, the inducer motor or the switch itself may have failed.
Limit Switch Open
DIY Fix PossibleThe furnace is overheating. Turn the unit off and check your air filter. A dirty filter restricts airflow and causes the limit switch to trip.
Polarity or Grounding Issue
Call a ProThe furnace control board is detecting an electrical issue. Do not attempt to fix this yourself. Call a certified technician to inspect the wiring and ground.