🔥Furnace

BLINK-9

Carrier · Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace

Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace BLINK-9 Error Fix: LED 9 Blinks — Check Grounding / Reversed Polarity

The furnace control board LED flashes 9 times, pauses, then repeats. This is an alternate grounding/polarity fault code that appears on some Carrier furnace models. Similar to the 6-blink code, it indicates improper electrical grounding or reversed polarity at the furnace's power supply. On some Carrier models, 9 blinks specifically indicates that the ground and neutral are not properly bonded, even if polarity appears correct. Verify: (1) The furnace has a proper equipment ground wire connected. (2) The electrical panel has a proper neutral-to-ground bond (main panel only). (3) Using a multimeter, check for voltage between neutral and ground at the furnace — it should be near zero volts. Any significant voltage indicates a wiring problem. (4) If the furnace is plugged into an outlet, try a different outlet. If hard-wired, have the circuit checked by an electrician. Portable generators without proper grounding can also trigger this code.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error BLINK-9 on the Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace means: LED 9 Blinks — Check Grounding / Reversed Polarity. The top-ranked community fix is “Verify Furnace Grounding and Neutral-to-Ground Bond at Electrical Panel” (hard difficulty, ~60 min, DIY cost: $0-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · furnace

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many furnace repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$300.

Other Carrier Models with Error BLINK-9

58STA090-1-16 90,000 BTU 80% AFUE Single-Stage Gas Furnace

furnace · 2 fixes

Carrier 58SB0 Comfort 80 Single-Stage 80% AFUE Gas Furnace

furnace · 2 fixes

Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower

furnace · 2 fixes

Other Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace Error Codes

BLINK-1

LED 1 Blink — System Lockout (Retries Exceeded)

2 fixes

BLINK-2

LED 2 Blinks — Pressure Switch Stuck Closed

2 fixes

BLINK-3

LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)

2 fixes

BLINK-4

LED 4 Blinks — Open High-Limit Switch (Overheating)

2 fixes

BLINK-5

LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

2 fixes

BLINK-6

LED 6 Blinks — 115V Power Reversed or Neutral Not Grounded

2 fixes

BLINK-7

LED 7 Blinks — Gas Valve Circuit Failure

2 fixes

BLINK-8

LED 8 Blinks — Ignitor Circuit Fault / Low Flame Signal

2 fixes

People Also Ask About Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace Error BLINK-9

What does error code BLINK-9 mean on a Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace?

Error code BLINK-9 on the Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace means: LED 9 Blinks — Check Grounding / Reversed Polarity. The furnace control board LED flashes 9 times, pauses, then repeats. This is an alternate grounding/polarity fault code that appears on some Carrier furnace models. Similar to the 6-blink code, it indicates improper electrical grounding or reversed polarity at the furnace's power supply. On some Carrier models, 9 blinks specifically indicates that the ground and neutral are not properly bonded, even if polarity appears correct. Verify: (1) The furnace has a proper equipment ground wire connected. (2) The electrical panel has a proper neutral-to-ground bond (main panel only). (3) Using a multimeter, check for voltage between neutral and ground at the furnace — it should be near zero volts. Any significant voltage indicates a wiring problem. (4) If the furnace is plugged into an outlet, try a different outlet. If hard-wired, have the circuit checked by an electrician. Portable generators without proper grounding can also trigger this code.

How do I fix error code BLINK-9 on my Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace?

The most successful fix is "Verify Furnace Grounding and Neutral-to-Ground Bond at Electrical Panel" (hard difficulty, ~60 minutes). Estimated DIY cost: $0-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code BLINK-9 on a Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace error BLINK-9 myself?

Yes — the top-ranked community fix ("Verify Furnace Grounding and Neutral-to-Ground Bond at Electrical Panel") is rated hard difficulty and takes about 60 minutes. Tools needed: Multimeter, Screwdrivers, Voltage tester.

How much does it cost to repair Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace error BLINK-9?

DIY cost: $0-$20. Professional repair typically costs $150-$300. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace have?

The Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes, including: BLINK-1 (LED 1 Blink — System Lockout (Retries Exceeded)), BLINK-2 (LED 2 Blinks — Pressure Switch Stuck Closed), BLINK-3 (LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)), BLINK-4 (LED 4 Blinks — Open High-Limit Switch (Overheating)), BLINK-5 (LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)), and 3 more.

Which other Carrier models have the BLINK-9 error?

Error code BLINK-9 also appears on 3 other Carrier models: 58STA090-1-16 90,000 BTU 80% AFUE Single-Stage Gas Furnace, Carrier 58SB0 Comfort 80 Single-Stage 80% AFUE Gas Furnace, Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace have?

The Carrier Carrier 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes:

Which other Carrier models have the BLINK-9 error?

Error code BLINK-9 also appears on 3 other Carrier models:

58STA090-1-16 90,000 BTU 80% AFUE Single-Stage Gas Furnace (furnace) · 2 fixes
Carrier 58SB0 Comfort 80 Single-Stage 80% AFUE Gas Furnace (furnace) · 2 fixes
Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower (furnace) · 2 fixes

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx