What It Means
Liquid line temperature sensor open or shorted circuit fault.
Trane AC & Heat Pump
Trane AC & Heat Pump Error Code Red 11 Flashes
Troubleshooting guide for the Trane AC & Heat Pump system fault Red 11 Flashes.
ACLogics Fix Trane code Red 11 Flashes See how ACLogics handles it → Fix Red 11 Flashes step-by-step
Possible Causes
- Loose liquid-line sensor connector.
- Damaged sensor wiring.
- Defective liquid line temperature sensor.
Not sure which one it is — or if it's none of these? Try ACLogics today.
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.
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Full Diagnosis
Liquid line temperature sensor fault (open or shorted).
All Recorded Causes
Inspect the liquid-line sensor and its connector. Reconnect if loose or replace the sensor if damaged.
Verify Before Replacing Parts
- Confirm the exact Trane model family and ac and heat pump context before acting on a generic code description.
- Verify the sensor or thermistor reading against the expected range for the current operating condition, keeping in mind that inspect the liquid-line sensor and its connector.
- Check the sensor harness and board connection before condemning the sensor itself; on Trane units this is also where you'd confirm reconnect if loose or replace the sensor if damaged.
- After the correction, run the system long enough to confirm the ac and heat pump fault does not return under normal load.
Not sure which system this Trane code is on?
ACLogics has guided diagnostics for 36 Trane fault codes and asks the right questions to narrow it down.
