BRYANT DIAGNOSTIC REFERENCE STATUS LED — SHORT + LONG FLASH CODES DOC BRYANT-23

Bryant furnace: Code 23 — Pressure Switch Did Not Open

Q: What does code 23 mean on a Carrier furnace?

Code 23 — Pressure Switch Did Not Open. Official: obstructed pressure tubing or a pressure switch stuck closed.

YOUR LIGHT: 2 SHORT + 3 LONG FLASHES — MATCH IT ABOVE

Professional repair

Bryant furnaces share the Carrier control platform — this code table applies to the equivalent Bryant models. Confirm against your unit's panel label.

What does code 23 mean on a Carrier furnace? Official: obstructed pressure tubing or a pressure switch stuck closed.

GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.

Try these first — in this order

Inspect/clear the tubing.

1Check: Obstructed pressure tubing

Still showing the code? See every cause ↓ Get repair quotes near you

Switch replacement. DIY part cost: $30–60 — a pro visit for this class of fault typically runs $150–350.

What causes it (in order of likelihood)

Obstructed pressure tubing DIY-CHECKABLE
Switch stuck closed TECH

Parts referenced by this code

Pressure Switch

$30–60 · Model-specific

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Always match parts against your model's parts list — part numbers vary within a series.

Applies to

58STA · 58STX · Bryant 310/311/312 系 · Payne PG8M 系

Different Bryant generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.

Verified against Carrier 58STA/58STX Installation & Service Instructions (1106202L), p.37/48

Last verified 2026-07-06 · how we verify