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Troubleshooting code

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Trane 4TWV8X24A1 Alert 191.01 troubleshooting

Outdoor fan rotation fault. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.

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What the code means

Alert 191.01: Outdoor fan rotation fault

The Trane variable-speed alert table identifies FAN ROTATE FLT when the outdoor fan cannot reach target speed.

System area
Outdoor fan motor
Service level
Call GreenFlow

Safe checks before calling

  • Confirm the thermostat is on, set correctly, and calling for heating or cooling.
  • Check the air filter and visible return-air path for obvious airflow restrictions.
  • Look around the outdoor unit for leaves, snow, ice, or other visible obstructions without opening the cabinet.
  • Take photos of the thermostat, outdoor unit, nameplate, and any visible flash pattern before scheduling service.

When to stop and call GreenFlow

Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.

Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.

Alert 191.01 questions

What does Alert 191.01 mean on a Trane 4TWV8X24A1?

The Trane variable-speed alert table identifies FAN ROTATE FLT when the outdoor fan cannot reach target speed.

What Trane message is associated with Alert 191.01?

The Trane source used for this page associates Alert 191.01 with "Outdoor fan rotation fault". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does Alert 191.01 point to?

This code is grouped under outdoor fan motor in the source-backed Trane troubleshooting data.

Which Trane documentation supports this Alert 191.01 page?

Source-backed Trane 4T-V8-SF-1G-EN Service Facts variable-speed alert-code table for 4TWV8/4TTV8 outdoor units.

What information should be captured for Alert 191.01 before clearing alerts?

Capture the exact code, any displayed alert text, the model and serial number, thermostat or control status, operating mode, symptoms, and photos of the display or LED pattern before the alert history is cleared.

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