What the code means
Red 6 Flash: Indoor heat issue
Trane AHR-SVX004C-EN red LED fault-code table for 5TEMC variable-speed air handlers identifies 6 flashes as an indoor heat issue including electric heat not detected or not configured.
Troubleshooting code
Back to all 5TEMCD04AV31 error codes
Trane 5TEMCD04AV31 Red 6 Flash troubleshooting
Indoor heat issue. 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.
Red 6 Flash questions
What does Red 6 Flash mean on a Trane 5TEMCD04AV31?
Trane AHR-SVX004C-EN red LED fault-code table for 5TEMC variable-speed air handlers identifies 6 flashes as an indoor heat issue including electric heat not detected or not configured.
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 F.
They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.
Jack B.
Andrey always does a great job.
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...
Sharad W.
Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...