Bryant Furnace Code 24.1
Hard lockoutShown as: 2 short flashes, 4 long flashes
Fuse fault - the 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiring.
Manual wording: “24.1 FUSE FAULT”
Documented for: 926TC, 912SE
Likely causes, most common first
- Short circuit in the secondary voltage (24 V) wiring, including the thermostat leads
When to call a technician
Simply replacing the fuse blows it again. A technician needs to isolate the shorted thermostat or accessory wire first.
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