What It Means
Pressure switch failed to open when inducer turned off.
Carrier Furnace
Carrier Furnace Error Code 23
Troubleshooting guide for the Carrier Furnace system fault 23.
Possible Causes
- Obstructed, kinked, or water-filled pressure tubing.
- Pressure switch contacts stuck closed.
- Faulty inducer motor operation or restricted vent.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Pressure Switch Did Not Open. Check obstructed pressure tubing or pressure switch stuck closed.
All Recorded Causes
Inspect pressure switch tubing for blockage, kinks, or water. Test pressure switch opens at rated pressure. Verify inducer motor operation. Check for proper venting and condensate drainage.
Verify Before Replacing Parts
- Confirm the exact Carrier model family and furnaces context before acting on a generic code description.
- Walk the entire heating sequence in order instead of jumping straight to the reported code, watching for inspect pressure switch tubing for blockage, kinks, or water.
- Verify each safety device and prove where the sequence stops under live operation, including whether test pressure switch opens at rated pressure.
- After the correction, run the system long enough to confirm the furnaces fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Carrier Furnace diagnostics step-by-step — so you confirm the cause before swapping parts.
