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Common Carrier fault codes with what each means, the likely cause, and what CANRO Heating & Cooling does to fix them. Servicing Carrier systems across Metro Vancouver since 1999.
Carrier Infinity 98, Performance 96, Comfort Series furnaces and Greenspeed/Infinity heat pumps display fault codes as numeric codes on the Infinity thermostat or as LED blink patterns on the control board. Most common Metro Vancouver Carrier codes:
Important: One reset attempt is generally safe for transient faults. If the same code returns within minutes, stop resetting — the lockout exists to protect the heat exchanger, ignition system, and gas-valve safety circuit. Note the exact code and call CANRO at (604) 359-1081. We carry common Carrier parts in every truck — most code-triggered faults are resolved in a single visit.
What it means: High-limit, rollout, or pressure-switch lockout after multiple retries.
Common causes: Low airflow, dirty filter, blocked vent.
What to do: Replace filter; clear blockage; call if persistent.
Reset guidance: one reset OK
What it means: Burner failed to light multiple times.
Common causes: Flame sensor fouling, ignitor, gas valve.
What to do: Flame sensor clean typical.
Reset guidance: one reset OK
What it means: Gas heating system fault.
Common causes: Various combustion issues.
What to do: Call CANRO.
Reset guidance: no
What it means: Low-voltage fuse blown.
Common causes: Short in thermostat wiring, failed transformer.
What to do: Service.
Reset guidance: no
What it means: Pressure switch closed when fan was off.
Common causes: Failed pressure switch.
What to do: Switch replacement.
Reset guidance: no
What it means: Limit switch open at start.
Common causes: Low flow at startup, failed switch.
What to do: Service.
Reset guidance: no
What it means: ECM blower motor signal abnormal.
Common causes: ECM blower failure (typically 10-12 year mark).
What to do: Blower service.
Reset guidance: no
What it means: Variable-speed inverter board fault.
Common causes: Inverter board failure.
What to do: Board service.
Reset guidance: no
What it means: Hot-surface ignitor not detected.
Common causes: Failed ignitor.
What to do: Ignitor replacement; $200-$350.
Reset guidance: one reset OK
What it means: Power supply voltage dropped during operation.
Common causes: Mains voltage issue.
What to do: Verify dedicated circuit.
Reset guidance: one reset OK
What it means: Repeated high-limit trips.
Common causes: Persistent low airflow or scaling.
What to do: Call CANRO.
Reset guidance: no
What it means: Inducer fan speed signal abnormal.
Common causes: Failed inducer motor (10-12 year mark).
What to do: Inducer replacement; $400-$650.
Reset guidance: no
What it means: Polarity reversed on power supply.
Common causes: Wiring fault.
What to do: Electrician check.
Reset guidance: no
What it means: Flame sense signal weak.
Common causes: Dirty flame sensor.
What to do: Sensor clean.
Reset guidance: one reset OK
What it means: Pilot light failed (older units).
Common causes: Pilot system issues.
What to do: Service.
Reset guidance: one reset OK
What it means: No flame.
Common causes: Flame sense, ignitor, gas.
What to do: Standard service.
Reset guidance: one reset OK
What it means: Infinity comm fault.
Common causes: Wiring or board.
What to do: Service.
Reset guidance: no
What it means: Communicating board, compressor, refrigerant.
Common causes: Specialized service.
What to do: no
Reset guidance: no — call
Note the exact code on your display, then call CANRO. Most Carrier faults are diagnosed and repaired on the first visit because we stock common Carrier service parts in every truck.
📞 Call (604) 359-1081 nowCANRO services Carrier furnaces, AC and heat pumps — A/C inventor since 1902 in every Metro Vancouver city — including same-day emergency response for no-heat, no-hot-water, and gas-leak situations. See our city-specific Carrier pages:
→ See the full Carrier lineup hub page with every model, specs, and install costs
This Carrier error code guide is maintained by the CANRO Heating & Cooling team based on 25+ years of Carrier install, service, and repair experience across Metro Vancouver. Codes and behaviour described match current model manuals. Last reviewed May 2026.
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