Bryant Furnace Code 25.6
Hard lockoutShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.6 on the display
Wrong program for the control being used - there is no heating operation until the control is reprogrammed to match.
Manual wording: “25.6 WRONG PROGRAM for control used - reprogram control so program matches control used. No heating operation.”
Documented for: 926TC, 912SE
Likely causes, most common first
- Control programmed with a program that does not match the board installed
When to call a technician
The dealer needs to reprogram the control so the program matches the board and the furnace's rating plate.
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