Bryant 315AAV Error Code 32: Low-Heat Pressure Switch Open
What Does Code 32 Mean?
Status code 32 on the Bryant 315AAV indicates that the low-heat pressure switch is open. If the switch remains open for longer than 5 minutes, the inducer motor shuts off and the blower runs for the selected off-delay period, followed by a 15-minute wait before retrying. The pressure switch monitors the draft created by the inducer motor to ensure exhaust gases are being safely vented out of your home.
Because the inducer runs at a lower speed during low-heat operation, even minor restrictions in the venting system can prevent the pressure switch from closing. This makes code 32 more sensitive to vent issues than codes that appear during high-heat operation.
Common causes include a restricted or blocked exhaust vent (ice, snow, debris, or bird nests at the outdoor termination), disconnected or obstructed pressure tubing between the inducer and the pressure switch, inadequate combustion air supply, or water pooling in horizontal vent runs. Excessive wind at the vent termination can also temporarily prevent the switch from closing.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blocked or restricted vent pipe | Most common | ✗ Call a pro → |
| Disconnected or obstructed pressure tubing | Common | ✗ Call a pro → |
| Defective inducer motor | Uncommon | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Code 32 persists after clearing vent obstructions and checking pressure tubing
- You find sagging vent pipe that needs to be re-supported or resized
- The inducer motor sounds weak, rattles, or does not start at all
- The pressure switch or its tubing appears damaged or cracked
- The furnace keeps failing on low-heat but works on high-heat
✓ Verified against manufacturer service manual — March 2026