Trane and American Standard E7 Error Code: Ignition failure, locked out
Updated October 2026 · Sourced from Trane and American Standard documentation
The furnace failed to light and locked out. The manual says failure to sense flame is often caused by carbon on the flame sensor, a disconnected or shorted sensor lead or a poorly grounded furnace. The control resets itself after one hour.
Is it safe to keep running? Check the steps below first. Call a licensed HVAC technician. Flame sensor cleaning and gas checks are for a professional.
E7 at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| E7 Error code on the control display, with the red diagnostic LED blinking | Ignition failure, locked out | Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models) |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Make sure the manual gas valve to the furnace is on (handle in line with the pipe), following the lighting instructions on the furnace label.
- Turn the furnace power switch or breaker off for 30 seconds, then back on, and see if the code clears.
- Check the thermostat is set to Heat, set above room temperature, and has fresh batteries if it uses them.
- Look outside at the furnace vent and intake pipes for snow, leaves, nests or other blockage, and clear anything you can reach safely.
🛑 Stop and call a licensed pro if
- Call a licensed HVAC technician. Flame sensor cleaning and gas checks are for a professional.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Flame rollout, limit or pressure switch codes that come back after one reset.
- Anything involving the control board, gas valve, flame sensor, igniter or venting.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Trane and American Standard code
- Count the LED flashes through the blower door window before you switch anything off. Cutting power can clear the code.
- Replace or clean the furnace air filter.
- Check the thermostat: correct mode, set above room temperature, and fresh batteries.
- Make sure the furnace power switch and breaker are on. If the furnace has locked out, turning the power off and back on once restarts it.
- Make sure the gas valve is in the ON position, following the lighting instructions on the furnace label only.
- On high-efficiency furnaces, look at the outside vent and intake pipes for snow, ice, leaves or nests (look only, do not take pipes apart).
Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician