Bryant Furnace Code 25.5
WarningShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.5 on the display
Installer settings corrupted. The control keeps running on default installer settings until the settings are reselected or the control is reprogrammed.
Manual wording: “25.5 INSTALLER SETTINGS CORRUPTED. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings.”
Documented for: 926TC, 912SE
Likely causes, most common first
- Stored installer settings became corrupted
What you can safely check yourself
- The furnace still runs on defaults - note the code for your technician
When to call a technician
The installer's airflow and delay settings need to be reselected by a dealer so the furnace matches your ductwork again.
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