Bryant Furnace Code 45.1
Soft lockoutShown as: 4 short flashes, 5 long flashes; 45.1 on the display
Control failure - flame circuit fault, memory mismatch, or sequence error on the control board.
Manual wording: “45.1 CONTROL FAILURE - flame circuit fault, memory mismatch or sequence error.”
Documented for: 926TC, 912SE
Likely causes, most common first
- Internal control board failure
What you can safely check yourself
- Turn the furnace off at the service switch for a minute and back on once - the label says to cycle power
When to call a technician
Bryant's own instruction is that if code 45 repeats after cycling power, the control must be replaced.
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