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Troubleshooting code

Back to all A801X080CM5SD error codes

Trane A801X080CM5SD E05 troubleshooting

Flame detected when it should not be present. 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

E05: Flame detected when it should not be present

The RunTru by Trane A801X furnace error-code table identifies E05 when flame is detected while it should not be present.

System area
Flame sensing
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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E05 questions

What does E05 mean on a Trane A801X080CM5SD?

The RunTru by Trane A801X furnace error-code table identifies E05 when flame is detected while it should not be present.

What Trane message is associated with E05?

The Trane source used for this page associates E05 with "Flame detected when it should not be present". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does E05 point to?

This code is grouped under flame sensing in the source-backed Trane troubleshooting data.

Which Trane documentation supports this E05 page?

Source-backed RunTru by Trane 88-A801X003-1C-EN furnace error-code table for A801X furnaces.

Is E05 related to combustion or furnace safety controls?

The Trane source row places this code in a combustion, ignition, limit, flame, or pressure-switch safety context. These codes should be interpreted from the exact equipment board and documented flash pattern.

What information should be captured for E05 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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