Carrier Furnace Error Code 23 Flash: How to Fix It

Q: What causes Carrier furnace error code 23 flash?

Error code 23 flash is caused by a pressure switch that fails to open, typically due to a shorted switch, blocked tubing, faulty inducer motor, or obstructed venting that prevents proper pressure differential.

Q: Can I reset Carrier furnace error 23 flash?

You can try resetting by turning off power for 5 minutes, but error 23 flash indicates a safety issue that won't clear until the underlying pressure switch problem is fixed. The error will return until repairs are completed.

Q: Is it safe to run furnace with error code 23 flash?

No, never run the furnace with error code 23 flash. This safety error prevents proper combustion air flow and could lead to dangerous conditions including carbon monoxide production or incomplete combustion.

Q: How much does it cost to fix Carrier error 23 flash?

DIY pressure switch replacement typically costs $30-80 for the part. Professional repair ranges from $150-400 including labor. Costs increase if additional components like the inducer motor need replacement.

Q: How long do Carrier furnace pressure switches last?

Pressure switches typically last 8-15 years depending on usage and conditions. Frequent cycling, moisture exposure, and electrical surges can reduce lifespan. Regular maintenance helps extend component life.

Abstract

Carrier furnace error code 23 flash indicates the pressure switch failed to open, typically caused by a shorted switch or blocked tubing. This high-severity error prevents your furnace from operating safely and requires immediate attention.