23 🟡 Repair Required
Carrier Error Code 23: Pressure Switch Fault
⚠️ Your Carrier furnace has detected a pressure switch fault, which prevents it from starting for safety reasons. A professional HVAC technician is needed to diagnose and repair the issue.
How to Fix Carrier Code 23
- Step 1: Check the air filter. A severely clogged filter can sometimes restrict airflow enough to trigger a pressure switch fault.
- Step 2: Visually inspect the vent pipes (both intake and exhaust) outside your home for any obvious obstructions like snow, ice, or debris. Safely clear any blockages you can reach.
- Step 3: If the problem persists after checking the filter and vents, contact a qualified HVAC technician to diagnose and repair the issue.
What Does Carrier Error Code 23 Mean?
The Carrier 23 error code, indicated by a specific blinking pattern on the unit's LED, signifies a problem with the pressure switch circuit. This switch is a crucial safety component that verifies proper venting before allowing the furnace to ignite. When the furnace induces draft, the pressure switch should close, proving that exhaust gases will vent properly. If the control board does not see the switch close, it will display error code 23 and shut down the unit to prevent potential hazards.
Common Causes of Carrier Code 23
- Blocked vent pipe (intake or exhaust)
- Failed pressure switch
- Loose or disconnected pressure switch tubing
- Faulty inducer motor
- Defective control board
Applicable Carrier Models
Need a Pro to Fix Carrier Code 23?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Carrier Furnace Code 23
Pressure Switch
Inducer Motor OEM: 326461-756
Control Board OEM: HK42FZ004