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Troubleshooting code

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Trane 5TWV0X36A1 Alert 172.01 troubleshooting

Display assembly key 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 172.01: Display assembly key fault

The Trane variable-speed alert table identifies KEY FAULT when the display assembly has a stuck key.

System area
Display assembly
Service level
Service recommended

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 172.01 questions

What does Alert 172.01 mean on a Trane 5TWV0X36A1?

The Trane variable-speed alert table identifies KEY FAULT when the display assembly has a stuck key.

What Trane message is associated with Alert 172.01?

The Trane source used for this page associates Alert 172.01 with "Display assembly key fault". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does Alert 172.01 point to?

This code is grouped under display assembly in the source-backed Trane troubleshooting data.

Which Trane documentation supports this Alert 172.01 page?

Source-backed Trane 5T-V0X-SF-1B-EN Service Facts variable-speed alert-code table for 5TWV0X/5TTV0X outdoor units.

What information should be captured for Alert 172.01 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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