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Troubleshooting code

Back to all A951X120DU5SA error codes

Trane A951X120DU5SA 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 A951X service-facts error-code table identifies E05 when flame is detected while it should not be present.

System area
Flame sensing
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.

E05 questions

What does E05 mean on a Trane A951X120DU5SA?

The RunTru by Trane A951X service-facts error-code table identifies E05 when flame is detected while it should not be present.

What should I safely check before scheduling service?

Check thermostat status, filter condition, visible outdoor-unit obstructions, and take photos of the flash pattern and nameplate. Do not open electrical panels or refrigerant-side components.

When should GreenFlow handle this code?

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.

Need help with this code?

GreenFlow can review the code, photos, equipment access, and symptoms before scheduling the right next step.

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always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

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