Bryant Furnace Code 34.1
WarningShown as: 3 short flashes, 4 long flashes
Ignition fault during four consecutive ignition trials - the furnace tried to light four times without proving flame.
Manual wording: “34.1 IGNITION FAULT - during four consecutive ignition trials.”
Documented for: 926TC, 912SE
Likely causes, most common first
- Gas valve turned off or manual shut-off valve closed
- Green/yellow ground wire not connected to the furnace sheet metal
- Flame sensor grounded or dirty
- Defective hot surface igniter
- Low inlet gas pressure
What you can safely check yourself
- Check that other gas appliances still work, confirming gas service is on
- Make sure the furnace door is fully closed and latched
When to call a technician
Checking the igniter, flame sense current, and gas valve requires opening a live gas appliance. Call a technician instead of attempting it.
A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installation, Start-up, Operating and Service and Maintenance Instructions - 926TC (Bryant Heating & Cooling Systems, 926TC Preferred Series two-stage, variable-speed ECM multipoise condensing gas furnace) · checked 2026-08-25
- Installation, Start-up, Operating and Service and Maintenance Instructions - 912SE (Bryant Heating & Cooling Systems, 912SE Legacy Line 92% single-stage condensing gas furnace) · checked 2026-08-25