Bryant 315AAV Error Code 23: Pressure Switch Did Not Open
What Does Code 23 Mean?
Status code 23 on the Bryant 315AAV indicates the pressure switch did not open as expected during the furnace operating sequence. The pressure switch monitors the negative pressure generated by the inducer motor and should open (break contact) at a specific point in the heating cycle to confirm the inducer is operating within safe parameters.
The service documentation identifies a stuck-closed pressure switch as the cause. A stuck-closed switch has a mechanical failure where the diaphragm or contact mechanism does not release even when pressure conditions would normally allow it to open. The switch may be failed internally, or debris or moisture may have entered the switch body and prevented it from operating freely.
Diagnosis requires checking the pressure switch with the power off, inspecting the rubber tubing connecting the switch to the inducer housing for kinks or clogs, and testing the switch contacts with a multimeter. A stuck-closed switch must be replaced with an OEM-specified component to ensure proper pressure calibration for the 315AAV.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Stuck closed pressure switch | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Contact a technician to inspect and test the pressure switch — the furnace will not complete a heating cycle with this fault active
- The pressure switch must be replaced with the correct OEM-specified component if found faulty
✓ Verified against manufacturer service manual — March 2026