Bryant Furnace Code 23.4
WarningShown as: Major code 23 flashed on the LED (2 short, 3 long); 23.4 on the display
Low-heat (LPS) pressure switch fault - the switch did not open when expected.
Manual wording: “23.4 LPS pressure switch”
Documented for: 926TC
Likely causes, most common first
- Obstructed pressure tube
- Pressure switch stuck closed
When to call a technician
Have a technician inspect the pressure tubing and switch; never jumper a pressure switch.
A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 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