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Troubleshooting code

Back to all A952V040BU3SB error codes

Trane A952V040BU3SB E2.1 troubleshooting

Retry exceeded; flame never sensed. 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

E2.1: Retry exceeded; flame never sensed

The RunTru by Trane A952V error-code table identifies E2.1 as retries exceeded because flame was never sensed.

System area
Ignition and 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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E2.1 questions

What does E2.1 mean on a Trane A952V040BU3SB?

The RunTru by Trane A952V error-code table identifies E2.1 as retries exceeded because flame was never sensed.

What Trane message is associated with E2.1?

The Trane source used for this page associates E2.1 with "Retry exceeded; flame never sensed". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does E2.1 point to?

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

Which Trane documentation supports this E2.1 page?

Source-backed RunTru by Trane FNR-SVX005A-EN integrated furnace control error-code table for A952V variable-speed furnaces.

Is E2.1 a sensor-related alert?

Yes. The documented row connects E2.1 to ignition and flame sensing. Sensor-related alerts should be interpreted by the exact code and operating mode rather than grouped with unrelated sensor faults.

Is E2.1 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 E2.1 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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