Green Flow Solution logo
Schedule Service

Troubleshooting code

Back to all A951X080BU4SA error codes

Trane A951X080BU4SA 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.

Virtual Consultation +1 (857) 767-6414

What the code means

E2.1: Retry exceeded; flame never sensed

The RunTru by Trane A951X service-facts error-code table identifies E2.1 as retries exceeded because flame was never sensed, resulting in a lockout condition.

System area
Ignition and 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.

Our Services

Showing services from our catalog

AHRI Certificate Matching Support service
ResidentialCommercialSupport

AHRI Certificate Matching Support

Match supported indoor and outdoor equipment combinations to AHRI certification records for planning and documentation.

View service details
Air Conditioner Blowing Warm Air service
ResidentialRepair

Air Conditioner Blowing Warm Air

Find the cause of warm air from a central AC system and restore proper cooling where possible.

View service details
Air Conditioner Not Cooling Repair service
ResidentialRepair

Air Conditioner Not Cooling Repair

Diagnose an air conditioner that runs but does not provide expected cooling.

View service details
Air Conditioner Short Cycling Repair service
ResidentialRepair

Air Conditioner Short Cycling Repair

Diagnose frequent AC starts and stops involving airflow, controls, electrical parts, sizing, or refrigerant conditions.

View service details
Air Conditioner Water Leak Repair service
ResidentialRepair

Air Conditioner Water Leak Repair

Diagnose condensate drainage, pan, coil, and pump conditions that cause water around an AC system.

View service details
Air Conditioner Will Not Turn On service
ResidentialRepair

Air Conditioner Will Not Turn On

Diagnose an AC system that does not start or respond to the thermostat.

View service details

E2.1 questions

What does E2.1 mean on a Trane A951X080BU4SA?

The RunTru by Trane A951X service-facts error-code table identifies E2.1 as retries exceeded because flame was never sensed, resulting in a lockout condition.

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 A951X-SF-1C-EN service facts error-code table for A951X 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.

Does E2.1 indicate a lockout condition?

The source-backed description for this row includes a lockout condition. Record the exact code and avoid repeated reset attempts before the fault history is documented.

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.

Brands We Service

Our Happy Customers

John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

Howard H.

Great experience. Knowledgeable and very fair. Highly recommend

Max P.

Green Flow got our AC back up and running at our condo the same day! Andrey was on time, super efficient, and with the right part on hand. The price was fair enough. Would definitely recommend them!

Jennifer Q.

Andrey is a great technician. He was incredibly respectful of our home, and he worked efficiently to complete the service.Green Flow Solution scheduled us easily. I like that they text a reminder for service on the day scheduled. I especially appreciate that I didn't have to wait days...

Valni D.

I’m delighted. Andrey the technician came on time and found the problem. They charged me fairly price.We thinking about hiring the company to maintain.

Robert B.

I honestly can't believe my experience with Green Flow. I submitted a request for help through Thumbtack and Hannah called me literally a minute later to schedule an appointment. Thirty minutes after that, Andree was at my place doing A/C repair and furnace service. One hour after that,...

Judy B.

Andrey was very efficient, professional and on time. The team had fast response to questions. Price to do heatpump maintenance was reasonable.

Rajib M.

Andrey from Green Flow came out exactly when he said he was going to and fixed a simple problem with the heating system at my rental property. Really appreciate the quick turnaround and fair pricing.

hhuang821

Recently, my tankless water heater stopped working. Green Flow Solution responded quickly after I submitted a request through Yelp. I was impressed by their service team’s responsiveness and prompt follow-up, even over the weekend. Andrey, the technician, arrived the next day and resolved the issue professionally—the system was...

Aniket G.

We used Andrey to replace the HVAC system. He was quick, efficient and knew what he was doing. I would surely recommend him.

Truc S.

I was frustrating about my heat system, they were very responsive and efficient. Andrey show up at my house after 30 mins from my call and on Sunday. He very acknowledge what is he doing. Thank you so much

Terry S.

Excellent service from best tech!