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Troubleshooting code

Back to all A951X120DU5SA error codes

Trane A951X120DU5SA E6.1 troubleshooting

Reversed voltage polarity. 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

E6.1: Reversed voltage polarity

The RunTru by Trane A951X service-facts error-code table identifies E6.1 as reversed voltage polarity.

System area
Power and grounding
Service level
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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.

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E6.1 questions

What does E6.1 mean on a Trane A951X120DU5SA?

The RunTru by Trane A951X service-facts error-code table identifies E6.1 as reversed voltage polarity.

What Trane message is associated with E6.1?

The Trane source used for this page associates E6.1 with "Reversed voltage polarity". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does E6.1 point to?

This code is grouped under power and grounding in the source-backed Trane troubleshooting data.

Which Trane documentation supports this E6.1 page?

Source-backed RunTru by Trane A951X-SF-1C-EN service facts error-code table for A951X furnaces.

What information should be captured for E6.1 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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