Bryant 315AAV Error Code 32: Low-Heat Pressure Switch Open
What Does Code 32 Mean?
Status code 32 on the Bryant 315AAV is a low-heat pressure switch open fault. On this induced-combustion furnace, the inducer motor must pull enough draft through the heat exchanger and flue to close the low-heat pressure switch before gas is allowed to flow. When that switch is open — meaning insufficient draft is proven — the control will not fire the burners.
Bryant's sequence is specific: if the switch stays open longer than 5 minutes, the inducer shuts off and the blower comes on for the selected off-delay period, and the furnace waits about 15 minutes before retrying. The manual lists a range of causes: a restricted or improperly sized vent, low inducer voltage (115V), disconnected or obstructed pressure tubing, a defective inducer motor, inadequate combustion air, and even excessive wind at the termination. This code is the low-heat counterpart to code 31 (high-heat pressure switch), and a disagreement between the two switches produces code 43.
Because the causes involve the venting system, pressure tubing, and inducer motor — all requiring inspection, meters, or draft testing — this is a technician diagnosis rather than a homeowner repair.
What You'll Notice
- The inducer runs but the burners never light, and the furnace produces no heat
- The status LED flashes three short then two long flashes
- The furnace cycles on a long delay — running the blower, pausing, and retrying roughly every 15 minutes
- The problem may worsen in high wind or after venting work, snow, or debris blocks the vent termination
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 → |
How This Is Diagnosed
A technician works the draft-proving chain from the vent inward: inspect the vent and intake terminations for blockage (ice, snow, nests, debris) and correct sizing, then check the pressure tubing to the switch for disconnection or obstruction. They verify the inducer is receiving proper voltage and producing adequate draft, and confirm the low-heat pressure switch itself responds correctly. Excessive wind and inadequate combustion air are also considered as listed causes.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The inducer runs but the burners will not light and the furnace keeps retrying
- The vent or intake termination may be blocked by snow, ice, debris, or a nest
- The problem correlates with high wind or appeared after venting work
- Any inspection of the pressure tubing, inducer motor, or venting, which is not a homeowner repair
Frequently Asked Questions
Why does my Bryant 315AAV inducer run but the burners never light?
Code 32 means the low-heat pressure switch is open, so the control cannot prove adequate draft and will not release gas. Causes include a blocked vent, disconnected pressure tubing, or a weak inducer.
How long before the furnace tries again?
If the switch stays open past about 5 minutes, the inducer stops and the blower runs its off-delay, and the furnace waits roughly 15 minutes before retrying.
Could weather cause code 32?
Yes. Bryant lists excessive wind as a cause, and a vent termination blocked by snow, ice, or debris can also open the pressure switch. A technician should confirm the venting is clear and correctly sized.
Sources
✓ Verified against manufacturer service manual — March 2026