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.)
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
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.
Questions about this code
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.)
How do I fix Bryant furnace rapid flashing?
This is wiring work; don't open panels or test voltage. Call an electrician or HVAC technician. Twinned furnaces have their own instructions.
How much does it cost to fix Bryant furnace rapid flashing?
Cost depends on where the reversed wiring is and how much correction is needed. Ask for a quote once the wiring fault has been located.
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 rapid flashing · Payne furnace rapid flashing
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”
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.