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Fujitsu Mini-Split Error Codes: Complete 2026 Reference

by Dua Jones May 29, 2026

Fujitsu mini-splits display fault codes on the indoor unit's LED panel or via red and green LED blink sequences on units without a numeric display. Fujitsu's residential ductless lineup — the Halcyon series — uses a consistent error code system across single-zone and multi-zone configurations. This guide covers every common Fujitsu error code with causes and recommended first responses for 2026.

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How Fujitsu Displays Error Codes

On Fujitsu models with a digital display, error codes appear as two-digit alphanumeric codes (e.g., E0:00, E1:02). On LED-only models, the OPERATION and TIMER LED lights blink alternately — count the flashes before the pause on each LED to get the two-digit code. The number of OPERATION LED flashes is the first digit; TIMER LED flashes is the second.

Common Fujitsu Error Codes

Error Code	Meaning	DIY Fix?	Action
E0:00	No error stored	N/A	Normal — no fault present
E1:02	Indoor / outdoor communication error	Partially	Reset at breaker; inspect signal wire connections at both units
E2:02	Indoor suction thermistor (room sensor) fault	No	Reset; call technician if recurring — thermistor replacement
E3:01	High pressure protection	Partially	Clear outdoor unit airflow; rinse condenser coil; reset
E4:01	Low pressure / refrigerant issue	No	Call EPA-certified technician — refrigerant leak check required
E5:01	Outdoor thermistor fault	No	Reset; call technician if recurring
E6:01	Indoor fan motor fault	No	Check for debris; call technician — fan motor inspection
E7:01	Outdoor fan motor fault	No	Check outdoor fan for debris; call technician
E9:01	Compressor overload / overheating	Partially	Clear outdoor unit airflow; reset; call tech if recurring
EE:EE	EEPROM / PCB memory fault	No	Call Fujitsu Elite dealer — PCB replacement likely needed

How to Read LED Blink Codes on Older Fujitsu Models

On Fujitsu units without a numeric display, hold down the ECO button on the indoor unit for 5 seconds — the unit enters diagnostic mode. The OPERATION LED (green) blinks the first digit of the code; the TIMER LED (orange) blinks the second digit. Count each sequence carefully, then look up the two-digit code in the table above. A pause of 2–3 seconds separates each digit.

Resetting a Fujitsu Mini-Split

For most fault codes: turn the unit off at the remote, flip the dedicated breaker OFF for 30 seconds, restore power, then wait 3 full minutes before operating. If the same code returns immediately, the fault is active and requires diagnosis rather than repeated resets.

Frequently Asked Questions

Where can I find the complete Fujitsu error code list for my model?

Fujitsu's model-specific service manuals are available through Fujitsu General's technical literature portal using your model number (found on the indoor unit nameplate). Fujitsu Elite dealers also have access to model-specific diagnostic tools. The codes above cover the most common faults across the Halcyon residential lineup — some commercial models have additional codes.

My Fujitsu has been running fine but suddenly shows E3:01 — should I worry?

E3:01 (high pressure protection) appearing on a previously working system usually means the outdoor unit's heat rejection is compromised — check for obstructions around the outdoor unit and rinse the condenser coil with a garden hose. If the outdoor temperature is extremely high (above 38°C / 100°F), the system may be hitting a protection threshold on a particularly hot day. Clear the coil, reset, and monitor. If E3:01 returns within the hour, call a technician.