Bryant furnace: Rapid Flashing — Reversed 115V Polarity
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.
Why is my Bryant furnace light blinking rapidly? Official: line-voltage polarity is reversed — and the control blocks heating until it's fixed. (If the furnace is twinned, see the twinning-kit instructions.)
Line-voltage wiring — electrician or HVAC tech.
What causes it (in order of likelihood)
- Hot/neutral reversed at the furnace TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Applies to
58STA · 58STX · Bryant 310/311/312 series · Payne PG8M series
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+46 — “RAPID FLASHING - Line voltage (115VAC) polarity reversed... will flash rapidly and prevent the furnace from heating”
Last verified 2026-07-06 · how we verify
Related Bryant fault codes
These codes use the same status led — short + long flash codes system.
| Pattern | Meaning |
|---|---|
| Code 11 — No Previous Fault Stored | |
| Status LED Off — No Power | |
| Code 12 — Blower-On After Power-Up | |
| Code 13 — Limit Circuit Lockout |