Bryant Furnace Code 13.1
Soft lockoutShown as: 1 short flash, 3 long flashes
Limit circuit lockout. The limit, draft safeguard, flame rollout, or blocked-vent switch has been open longer than 3 minutes. The control locks out and auto-resets after 3 hours.
Manual wording: “13.1 LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit, draft safeguard, flame rollout, or blocked vent switch*(if used) is open longer than 3 minutes. Control will auto-reset after 3 hours. See code 33.”
Documented for: 926TC, 912SE
Likely causes, most common first
- Sustained overheating from restricted airflow - see code 33 for the full cause list
- Flame rollout switch tripped (requires manual reset by a technician)
- Defective limit switch or connections
What you can safely check yourself
- Check and replace a dirty air filter
- Make sure supply registers and return grilles are open and not blocked
- Make sure the furnace blower door is fully closed and latched
When to call a technician
A 3-minute limit trip means the furnace was genuinely overheating or not venting. Have a technician confirm why before running it again - a tripped flame rollout switch in particular must never be reset without finding the cause.
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