Bryant Furnace Code 34.2
Safety faultShown as: Major code 34 on the LED (3 short, 4 long); 34.2 on the display
After successful ignition (flame proven), flame was lost before the heating blower on-delay finished.
Manual wording: “34.2 AFTER SUCESSFUL IGNITION flame loss before heating blower on delay”
Documented for: 926TC, 912SE
Likely causes, most common first
- Oxide buildup on the flame sensor
- Low inlet gas pressure
- Poor control ground continuity
- Inadequate flame carryover or rough ignition
What you can safely check yourself
- Confirm other gas appliances in the house are working normally
When to call a technician
Flame loss right after ignition is a combustion and flame-sensing problem for a technician; do not attempt to clean or reposition the flame sensor yourself.
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