Carrier Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower BLINK-5 Error Fix: LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

Error code BLINK-5 on the Carrier Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower means: LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous). The furnace control board LED flashes 5 times, pauses, then repeats. The flame sensor is detecting flame when the gas valve SHOULD be closed. This is a potentially dangerous condition that could indicate: (1) A stuck-open gas valve that is allowing gas to flow even when the control board has not called for it — this must be addressed immediately as it creates a fire/explosion risk. Shut off the manual gas valve immediately and call a qualified HVAC technician. (2) The flame sensor circuit is picking up stray voltage or leakage current, causing a false flame signal — this is a control board issue. (3) A gas valve circuit wiring problem. Do NOT attempt to reset the furnace when this code appears. Turn off the gas supply first. This code is rare but serious — it indicates a potential gas safety issue that should be evaluated by a licensed professional.

The most successful fix is "Shut Off Gas Supply and Call a Licensed HVAC Technician Immediately" (easy difficulty, ~10 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Shut Off Gas Supply and Call a Licensed HVAC Technician Immediately") is rated easy difficulty and takes about 10 minutes. Tools needed: .

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

The Carrier Carrier 59TP6A080E17 80,000 BTU 96% AFUE Two-Stage Gas Furnace with Variable-Speed Blower has 8 other known error codes, including: BLINK-1 (LED 1 Blink — System Lockout (Retries Exceeded)), BLINK-10 (LED 10 Blinks — Secondary Limit Switch Open (Condensing)), 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)), and 3 more.

Error code BLINK-5 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 58STA/STX 80,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace. The fix may vary by model, so check each model's specific page for tailored repair steps.