Bryant furnace code 12: Blower-On After Power-Up
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 Bryant 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.
Questions about this code
What does code 12 mean on a Bryant 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.
Does Bryant furnace code 12 mean I need a repair?
It's informational, not a fault. Wait for that to finish; if heating doesn't follow, note any new code and contact a technician.
How much does it cost to fix Bryant furnace code 12?
Code 12 doesn't call for a repair, so there's no cost tied to it. Any service cost depends on a separate problem if one appears.
Applies to
Bryant 310/311/312 series
Different Bryant generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Same control platform, same code: Carrier furnace code 12 · Payne furnace code 12
Verified against Carrier 58STA/58STX Installation & Service Instructions (1106202L), p.37/48
Bryant 310/311/312 series furnaces use the Carrier 58STA/58STX control platform. No separate Bryant service document is cited — confirm the code map against your unit's panel label.
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Bryant furnace codes
These codes use the same status led — short + long flash codes system.