System Diagnosis
Liquid line temperature sensor fault (open or shorted).
American Standard | AC and Heat Pump
Error Code Red 11 Flashes
Troubleshooting guide for the American Standard AC and Heat Pump system fault Red 11 Flashes.
A
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.
Potential Causes & Solutions
- Inspect the liquid-line sensor and its connector.
- Reconnect if loose or replace the sensor if damaged.
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