BRYANT DIAGNOSTIC REFERENCE STATUS LED — SHORT + LONG FLASH CODES DOC BRYANT-12

Bryant furnace: Code 12 — Blower-On After Power-Up

Q: What does code 12 mean on a Carrier furnace?

Code 12 — Blower-On After Power-Up. The furnace was powered up in the middle of a call for heat (R-W closed), so the blower runs 90 seconds first. Informational, not a fault.

YOUR LIGHT: 1 SHORT + 2 LONG FLASHES — MATCH IT ABOVE

Info — not a fault

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 12 mean on a Carrier furnace? The furnace was powered up in the middle of a call for heat (R-W closed), so the blower runs 90 seconds first. Informational, not a fault.

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

Try these first — in this order

Wait 90 seconds.

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

A licensed technician can diagnose this in one visit.

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