Payne PG95ESA Error Code 23: Pressure Switch Did Not Open
What Does Code 23 Mean?
Status code 23 (two short flashes followed by three long flashes) means a pressure switch did not open when the control expected it to. On a condensing furnace like the PG95ESA the pressure switches must open at rest (before the inducer builds draft) and close once proper draft exists; the control checks this sequence for safety. When a switch that should be open is instead found closed, the furnace flags code 23.
The usual cause is a pressure switch stuck in the closed position, or a clogged switch port or tubing holding the contacts closed. A switch welded or stuck closed defeats the safety check — the control can no longer confirm that draft is actually being established by the inducer, only that the switch is reporting closed at the wrong time.
This is the mirror image of codes 31 and 32, which set when a pressure switch fails to close (the inducer housing switch, HPS, in code 31; the collector box low pressure switch, LPS, in code 32). Code 23 is instead about a switch failing to open. Because verifying and replacing a pressure switch and clearing its ports is diagnostic and parts work, code 23 is a professional repair.
What You'll Notice
- The amber LED flashes two short flashes followed by three long flashes (code 23)
- The furnace will not proceed through a normal heating sequence because the pre-start safety check fails
- The inducer behavior looks abnormal — the furnace stalls at the start of the sequence rather than lighting
- No heat is produced while the control holds this fault
- The problem recurs consistently, since a stuck switch does not fix itself between cycles
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Pressure switch stuck in the closed position | Most common | ✗ Call a pro → |
| Clogged pressure switch port or tubing | Common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms the pressure switch is genuinely stuck closed rather than being held closed by a real condition. They check the switch contacts at rest with the inducer off — a healthy switch should read open — and inspect the switch port and tubing for a blockage (such as condensate or debris) that could keep it closed.
If the switch stays closed with no draft present, it is defective and is replaced; if a clogged port or tube is holding it closed, that is cleared and the switch retested. These checks involve the pressure switch, its tubing, and the inducer circuit and are done by a qualified technician. There is no homeowner-safe repair for a stuck pressure switch.
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 LED shows code 23 and the furnace stalls at the start of its sequence
- The fault repeats every cycle, consistent with a switch stuck closed
- Any repair would involve testing or replacing the pressure switch or clearing its ports and tubing
- The furnace produces no heat because the pre-start safety check will not pass
Frequently Asked Questions
What does code 23 mean on a Payne PG95ESA?
It means a pressure switch did not open when the control expected it to — usually a switch stuck closed or a clogged switch port. The control flags it as a safety fault and needs a technician to inspect and replace the switch.
How is code 23 different from codes 31 and 32?
Can I fix a stuck pressure switch myself?
No. Confirming a stuck switch, clearing its ports and tubing, and replacing it are diagnostic and parts tasks tied to the furnace's safety venting circuit. This should be handled by a qualified HVAC technician.
✓ Verified against manufacturer service manual — March 2026