Bryant 315AAV Error Code 23: Pressure Switch Did Not Open
What Does Code 23 Mean?
Status code 23 on the Bryant 315AAV indicates a pressure switch that failed to open when the control's start-up sequence expected it to. Before the inducer starts, the control checks that the pressure switch contacts are in their normal open state; if a switch is already closed when it should be open, the control cannot verify that the switch is doing its job of proving proper draft, so it flags code 23.
Bryant's data points to a stuck-closed pressure switch as the cause. The pressure switches on this induced-combustion furnace exist to confirm the inducer is establishing adequate venting before gas is allowed to flow; a switch welded or stuck in the closed position defeats that safety proof. This is the mirror image of codes 32 and 43, where a pressure switch is open when it should be closed — here the switch is closed when it should be open.
Because diagnosing and replacing a pressure switch, and confirming the venting and inducer that drive it, requires meters and knowledge of the draft system, this is a technician repair rather than a homeowner task.
What You'll Notice
- The furnace will not proceed into ignition and produces no heat
- The status LED flashes two short then three long flashes
- The failure occurs at the start of the sequence, before the burners would normally light
- The problem is consistent rather than weather-related, since it stems from a stuck switch
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Stuck closed pressure switch | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms the pressure switch is failing to open on the control's pre-purge check, then tests the switch electrically to see whether its contacts are stuck closed. They also verify the switch is the correct part and that its wiring is not shorting the contacts closed. Because a stuck-closed switch defeats a safety proof, the switch is replaced rather than bypassed.
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 furnace repeatedly fails to start and flags code 23
- A pressure switch is suspected of being stuck closed
- The code persists after power is cycled
- Any work involving the pressure switch or draft-proving circuit, which is not a homeowner repair
Frequently Asked Questions
What does 'pressure switch did not open' mean on my Bryant 315AAV?
Before the inducer runs, the control expects the pressure switch contacts to be open. Code 23 means a switch was still closed when it should have been open, usually because it is stuck closed.
How is code 23 different from code 32?
Code 23 is a pressure switch stuck closed when it should be open. Code 32 is the opposite — the low-heat pressure switch is open when the control expects it closed, usually from a venting or inducer problem.
Can I fix a stuck pressure switch myself?
No. Testing and replacing the pressure switch, and confirming the inducer and venting that operate it, requires a technician. A safety switch should never be bypassed.
Sources
✓ Verified against manufacturer service manual — March 2026