What the code means
E6.3: Igniter relay or open igniter fault
The RunTru by Trane A951X service-facts error-code table identifies E6.3 as an igniter relay failure or open igniter condition.
Troubleshooting code
Back to all A951X060BU4SA error codes
Trane A951X060BU4SA E6.3 troubleshooting
Igniter relay or open igniter fault. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
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.
E6.3 questions
What does E6.3 mean on a Trane A951X060BU4SA?
The RunTru by Trane A951X service-facts error-code table identifies E6.3 as an igniter relay failure or open igniter condition.
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.
Brands We Service
No matching featured brand found.
Popular cities
Service Areas
No matching service area found
Try another nearby city or contact GreenFlow to confirm service availability.
Our Happy Customers
Anna G.
They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.
Melissa S.
The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.
Jahangir R.
They were very organized to communicate and be on time to come to look at my air condition to fix it.
Neal V.
In an industry that often fraught with contractors taking advantage of homeowners, Andrey was honest with his assessment and willing to install a product acquired elsewhere (most want that margin themselves), patiently answered my questions (I’m an engineer so like to understand what’s happening), and proactively offered practical...