Fujitsu Air Conditioner Error Codes

The Fujitsu air conditioner error codes help technicians and users identify the possible causes of system malfunctions.

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Error Code Table

Error Code	Description
E0:00	Communication error: indoor unit to remote control.
E1:00	Communication error: indoor unit to outdoor unit.
E2:00	Return air thermistor circuit open.
E3:00	Return air thermistor circuit shorted.
E4:00	Indoor coil thermistor open.
E5:00	Indoor coil thermistor shorted.
E6:00	Outdoor coil thermistor open.
E7:00	Outdoor coil thermistor shorted.
EA:00	Outdoor ambient thermistor open.
Eb:00	Outdoor ambient thermistor shorted.
Ec:00	Discharge pipe thermistor open.
Ed:00	Discharge pipe thermistor shorted.
EE:00	High-pressure issue.
EF:00	Discharge pipe temperature issue: excessively high = insufficient refrigerant.

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Additional Error Codes

Error Code	Description
OO	Communication failure between indoor unit and remote control.
O1	Communication failure between indoor and outdoor units.
O2	Indoor air sensor circuit open.
O3	Indoor air sensor circuit shorted.
O4	Indoor pipe sensor circuit open.
O5	Indoor pipe sensor circuit shorted.
O6	Outdoor pipe sensor failure.
O8	Power source connection failure.
O9	Drainage problem: float switch activated.
OA	Outdoor air sensor failure.
OC	Discharge sensor failure.
OE	Outdoor high-pressure heat sink error.
11	Outdoor PCB failure.
12	Indoor fan failure.
13	Abnormal outdoor signal: indoor unit signal error.
14	Outdoor EEPROM failure.
15	Compressor temperature failure.
16	Pressure switch error.
17	IPM error.
18	CT error.
19	Active filter module error.
1A	Compressor failure.
1B	Outdoor fan failure.
1C	Inverter-to-PCB communication failure.
1D	Two-way valve sensor failure.
1E	Expansion valve error.
1F	Indoor unit connection error.

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Fujitsu Air Conditioner Cassette Error Codes

Red and Green Light	Current Models	Description
Off-2 blinks	Reverse communication failure at startup.
Off-3 blinks	Reverse communication failure during use.
Off-4 blinks	Forward communication failure at startup.
Off-5 blinks	Forward communication failure during use.
Off-8 blinks	Wired remote control failure.
2 blinks-2 blinks	Indoor air sensor failure.
2 blinks-3 blinks	Indoor pipe sensor failure.
2 blinks-4 blinks	Indoor heat exchanger sensor error.
2 blinks-6 blinks	Float switch activated.
3 blinks-2 blinks	Outdoor unit discharge sensor failure.
3 blinks-3 blinks	Outdoor unit pipe sensor failure.
3 blinks-4 blinks	Outdoor air sensor failure.
3 blinks-7 blinks	Heat sink sensor error.
3 blinks-8 blinks	Compressor temperature sensor failure.
4 blinks-2 blinks	Forced automatic switch soldered.
4 blinks-3 blinks	Main relay soldered.
4 blinks-4 blinks	Power supply failure.
4 blinks-7 blinks	Permanent stop VDD protection.
4 blinks-8 blinks	Reverse permanent stop VDD protection.
5 blinks-2 blinks	IPM protection.
5 blinks-3 blinks	Abnormal CT.
5 blinks-5 blinks	Compressor failure.
5 blinks-6 blinks	Outdoor fan failure.
6 blinks-2 blinks	Indoor fan motor locked.
6 blinks-3 blinks	Indoor fan motor rotation error.
7 blinks-2 blinks	High discharge temperature.
7 blinks-3 blinks	High pressure.
7 blinks-4 blinks	Four-way valve abnormality.
7 blinks-5 blinks	Pressure switch failure.
7 blinks-6 blinks	Compressor temperature error.
8 blinks-2 blinks	First active filter module AFM failure.
8 blinks-3 blinks	Second active filter module AFM failure.
8 blinks-4 blinks	PFC circuit error.
Blink-blink	PCB failure.