What this code means
Trane AHR-SVX008A-EN LED indicator system-failure table for 5TDM5 air handlers identifies running indicator light out for 6 seconds then flashing once as an indoor ambient temperature sensor error.
Safe checks
- 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.
First step
Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains.
Frequently asked questions
What does Running 6s 1 flash mean on a Trane 5TDM5B03AC21?
Trane AHR-SVX008A-EN LED indicator system-failure table for 5TDM5 air handlers identifies running indicator light out for 6 seconds then flashing once as an indoor ambient temperature sensor error.
What should I safely check before scheduling service?
Use only the visible, non-invasive checks listed on this page. Do not open equipment panels.
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.