CARRIER DIAGNOSTIC REFERENCE STATUS LED — SHORT + LONG FLASH CODES DOC CARRIER-RAPID-FLASHING

Carrier furnace: Rapid Flashing — Reversed 115V Polarity

Q: Why is my Carrier furnace light blinking rapidly?

Rapid Flashing — Reversed 115V Polarity. 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.)

YOUR LIGHT: RAPID CONTINUOUS FLASHING — MATCH IT ABOVE

Professional repair

Why is my Carrier 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.)

See what causes this code ↓ Get repair quotes near you

Line-voltage wiring — electrician or HVAC tech.

What causes it (in order of likelihood)

Hot/neutral reversed at the furnace TECH

Applies to

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

Different Carrier 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