40 Fujitsu air conditioner error codes

Table of Contents

This is our latest fujitsu AC troubleshooting guide. We included the full list of fujitsu aircon error codes and some troubleshooting procedure.

Troubleshooting at the remote control LCD

If an error occurs, the following display will be shown. (“EE” will appear in the set room temperature display.)

If “CO” appears in the unit number display, there is a remote control error.

Refer to the installation instruction sheet included with the remote control. If you need still need a helping hand, our previous how to repair ac remote control guide may help.

Troubleshooting at the outdoor unit LED

Make a TEST RUN in accordance with the installation instruction sheet for the indoor unit.

When a malfunction occurs in the outdoor unit, the LED on the circuit board lights to indicate the error.

Refer to the following table for the description of each error according to the LED

LEDError
1 flashCommunication error (Indoor unit – Outdoor unit)
2 flashDischarge pipe temperature sensor
3 flashOutdoor heat exchanger temperature (outlet) sensor
4 flashOutdoor temperature sensor
5 flashOutdoor heat exchanger temperature (mid) sensor
6 flashDischarge pipe temperature abnormal
7 flashCompressor temperature sensor
8 flashHeat sink temperature sensor
9 flashPressure switch abnormal
10 flashCompressor temperature abnormal
12 flashIPM error
13 flashCompressor rotor position cannot detect
14 flashCompressor cannot operate
15 flashOutdoor fan abnormal (upper fan)
16 flashOutdoor fan abnormal (lower fan)
5 sec on/ 0.1 sec off repeatPAM voltage abnormality
5 sec on/ 1 sec off repeatProtect operation
5 sec on/ 2 sec off repeatPFC surge protection (permanent stop)
5 sec on/ 5 sec off repeatFan malfunction
2 sec on/ 2 sec off repeatCT abnormality
2 sec on/ 5 sec off repeatCompressor temperature protection (permanent stop)
1 sec on/ 1 sec off repeatPump down operation
0.5 sec on/ 0.5 sec off repeatCurrent surge protection
0.1 sec on/ 0.1 sec off repeatThermistor malfunction
0.1 sec on/ 2 sec off repeat Compressor position detection malfunction
offNo error

Troubleshooting at the indoor unit display

Troubleshooting fujitsu ac at the indoor unit display

Error is displayed on the wired and wireless remote control. Lamps show error contents by flashing as follows.

OPERATION LampTIMER LampFILTER LampPossible Errors
off2 timesoffIndoor signal error
off3 timesoffIndoor signal error
off4 timesoffIndoor signal error
off5 timesoffIndoor signal error
off8 timesoffWired remote controller abnormal
2 times2 timesoffIndoor room temperature sensor error
2 times3 timesoffIndoor heat exchanger temperature sensor (middle) error
2 times4 timesoffIndoor heat exchanger temperature sensor (inlet) error
2 times6 timesoffFloat switch operated
3 times2 timesoffOutdoor discharge pipe temperature sensor error
3 times3 timesoffOutdoor heat exchanger temperature sensor (outlet) error
3 times4 timesoffOutdoor temperature sensor error
3 times7 timesoffHeat sink thermistor (Inverter) error
3 times8 timesoffCompressor temperature sensor error
3 timesoff2 times2-way valve temperature sensor error
3 timesoff3 times3-way valve temperature sensor error
3 timesoff4 timesOutdoor heat exchanger temperature sensor (middle) error
3 timesoff5 timesHeat sink thermistor (P.F.C) error
4 times2 timesoffIndoor manual auto switch abnormal
4 times4 timesoffPower supply frequency detection error
5 times2 timesoffIPM protection
5 times3 timesoffCT error
5 times5 timesoffCompressor location error
5 times6 timesoffOutdoor fan error
5 times7 timesoffConnected indoor unit abnormal
5 times8 timesoffOutdoor unit computer communication error
5 timesoff2 timesInverter error
6 times2 or 3 timesoffIndoor fan abnormal
7 times2 timesoffDischarge temperature error
7 times3 timesoffExcessive high pressure protection on cooling
7 times4 timesoff4-way valve abnormal
7 times5 timesoffPressure switch abnormal, Pressure sensor abnormal
7 times6 timesoffCompressor temperature error
7 times7 timesoffLow pressure error
8 times2 or 3 timesoffActive filter abnormal
8 times4 timesoffPFC circuit error
8 times6 timesoffP.F.C PCB error
9 times2 timesoffRefrigerant circuit address set-up error
9 times3 timesoffMaster unit, Slave unit set-up error
9 times4 timesoffConnected indoor number set-up error

Flash means “0.5 second on / 0.5 second off”.

Fujitsu air conditioner error code 00

Wired remote controller abnormal.

Fujitsu air conditioner error code 01

Indoor signal error.

Fujitsu air conditioner error code 02

Indoor room temperature sensor error

Fujitsu air conditioner error code 04

Indoor heat exchanger temperature sensor (middle) error

Fujitsu air conditioner error code 06

Outdoor heat exchanger thermistor (outlet) error.

Fujitsu air conditioner error code 09

Float switch operated.

Fujitsu air conditioner error code 12

Indoor fan abnormal.

Fujitsu air conditioner error code 13

Serial forward transfer error.

Fujitsu air conditioner error code 15

Compressor temperature sensor error.

Fujitsu air conditioner error code 16

Pressure switch abnormal, Pressure sensor abnormal.

Fujitsu air conditioner error code 17

IPM protection.

Fujitsu air conditioner error code 18

CT error

Fujitsu air conditioner error code 19

Active filter abnormal.

Fujitsu air conditioner error code 20

Indoor manual auto switch abnormal.

Fujitsu air conditioner error code 24

Excessive high pressure protection on cooling.

Fujitsu air conditioner error code 25

P.F.C. circuit error.

Fujitsu air conditioner error code 26

Communication error ( Main PCB to Display PCB )

Fujitsu air conditioner error code 27

Communication error ( Display PCB to Main PCB )

Fujitsu air conditioner error code 28

Indoor heat exchanger thermistor (inlet) error.

Fujitsu air conditioner error code 29

Outdoor heat exchanger thermistor (middle) error.

Fujitsu air conditioner error code 30

Refrigerant circuit address set-up error.

Fujitsu air conditioner error code 31

Master unit, Slave unit set-up error.

Fujitsu air conditioner error code 32

Connected the indoor number set-up error.

Fujitsu air conditioner error code 33

P.F.C. PCB error.

Fujitsu air conditioner error code 0A

Outdoor temperature sensor error.

Fujitsu air conditioner error code 0C

Outdoor discharge pipe temperature sensor error.

Fujitsu air conditioner error code 0E

Heat sink thermistor (Inverter) error.

Fujitsu air conditioner error code 0F

Discharge temperature error.

Fujitsu air conditioner error code 1A

Compressor location error.

Fujitsu air conditioner error code 1B

Outdoor fan error.

Fujitsu air conditioner error code 1C

Outdoor unit computer communication error.

Fujitsu air conditioner error code 1D

2-way valve temperature sensor error.

Fujitsu air conditioner error code 1E

3-way valve temperature sensor error.

Fujitsu air conditioner error code 1F

Connected indoor unit abnormal.

Fujitsu air conditioner error code 2A

Power supply frequency detection error.

Fujitsu air conditioner error code 2B

Compressor temperature error.

Fujitsu air conditioner error code 2C

4-way valve abnormal

Fujitsu air conditioner error code 2D

Heat sink thermistor (P.F.C.) error.

Fujitsu air conditioner error code 2E

Inverter error.

Fujitsu air conditioner error code 2F

Low pressure error.

General Troubleshooting

1. Fujitsu AC doesn’t operate immediately

Possible causes:

  • If the unit is stopped and then immediately started again, the compressor will not operate for about 3 minutes, in order to prevent fuse blowouts.
  • Whenever the Power Supply Plug is disconnected and then reconnected to a power outlet, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.

2. Fujitsu AC have noise

Possible causes:

  • During operation and immediately after stopping the unit, the sound of water flowing in the air conditioner’s piping may be heard. Also, noise may be particularly noticeable for about 2 to 3 minutes after starting operation (sound of coolant flowing).
  • During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the front cover due to temperature changes.
  • During Heating operation, a sizzling sound may be heard occasional. This sound is produced by the Automatic Defrosting operation

3. Fujitsu AC have smell

Possible cause:

  • Some smell may be emitted from the indoor unit. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the air conditioner.

4. Mist or steam are emitted in Fujitsu AC

Possible causes:

  • During Cooling or Dry operation, a thin mist may be seen emitted from the indoor unit. This results from the sudden Cooling of room air by the air emitted from the air conditioner, resulting in condensation and misting.
  • During Heating operation, the outdoor unit’s fan may stop, and steam may be seen rising from the unit. This is due to Automatic Defrosting operation.

5. Fujitsu AC airflow is weak or stops

Possible causes:

  • When Heating operation is started, fan speed is temporarily very low, to allow internal parts to warm up.
  • During Heating operation, if the room temperature rises above the thermostat setting, the outdoor unit will stop, and the indoor unit will operate at very low fan speed. If you wish to warm the room further, set the thermostat for a higher setting.
  • During Heating operation, the unit will temporarily stop operation (between 7 and 15 minutes) as the Automatic Defrosting mode operates. During Automatic Defrosting operation, the OPERATION Indicator Lamp will flash.
  • The fan may operate at very low speed during Dry operation or when the unit is monitoring the room’s temperature.
  • During SUPER QUIET operation, the fan will operate at very low speed.
  • In the monitor AUTO operation, the fan will operate at very low speed.

6. Water is produced from Fujitsu AC outdoor unit

Possible cause:

  • During Heating operation, water may be produced from the outdoor unit due to Automatic Defrosting operation.

7. Fujitsu AC doesn’t operate at all

Possible causes:

  • Is the Power Supply Plug disconnected its outlet?
  • Has there been a power failure?
  • Has a fuse blown out, or a circuit breaker been tripped?
  • Is the timer operating?

7. Fujitsu AC not cool

Possible causes:

  • Is the Air Filter dirty?
  • Air the air conditioner’s intake grille or outlet port blocked?
  • Did you adjust the room temperature settings (thermostat) correctly?
  • Is there a window or door open?
  • In the case of Cooling operation, is a window allowing bright sunlight to enter? (Close the curtains.)
  • In the case of Cooling operation, are there heating apparatus and computers inside the room, or are there too many people in the room?

7. Fujitsu AC operates differently from the Remote Controller’s setting

Possible causes:

  • Are the Remote Controller’s batteries dead?
  • Are the Remote Controller’s batteries loaded properly?

How to clean Fujitsu air conditioner intake grille?

1. Remove the Intake Grille

How to clean Fujitsu air conditioner intake grille step 1
  • Place your fingers at both lower ends of the grille panel, and lift forward; if the grille seems to catch partway through its movement, continue lifting upward to remove.
  • Pull past the intermediate catch and open the Intake Grille wide so that it become horizontal.

2. Clean with water

Remove dust with a vacuum cleaner; wipe the unit with warm water, then dry with a clean, soft cloth.

3. Replace the Intake Grille

How to clean  Fujitsu air conditioner intake grille step 3
  • Pull the knobs all the way.
  • Hold the grille horizontal and set the left and right mounting shafts into the bearings at the top of the panel.
  • Press the place where the arrow on the diagram indicates and close the Intake Grille.

How to clean Fujitsu air conditioner air filter?

Total Time: 30 minutes

  1. Open the Intake Grille, and remove the air filter.

    How to clean Fujitsu air conditioner air filter step 1

    Lift up the air filter’s handle, disconnect the two lower tabs, and pull out air filter handle.

  2. Remove dust with a vacuum cleaner or by washing.

    After washing, allow to dry thoroughly in a shaded place.

  3. Replace the Air Filter and close the Intake Grille.

    How to clean Fujitsu air conditioner air filter step 3

    Align the sides of the air filter with the panel, and push in fully, making sure the two lower tabs are returned properly to their holes in the panel. Close the Intake Grille.

  • Dust can be cleaned from the air filter either with a vacuum cleaner, or by washing the filter in a solution of mild detergent and warm water. If you wash the filter, be sure to allow it to dry thoroughly in a shady place before reinstalling.
  • If dirt is allowed to accumulate on the air filter, air flow will be reduced, lowering operating efficiency and increasing noise.
  • During periods of normal use, the Air Filters should be cleaned every two weeks.

How to replace Fujitsu air conditioner air filter?

Replace filters with the following components (purchased separately).

  • POLYPHENOL CATECHIN AIR CLEANING FILTER : UTR-FA13-1
  • Negative air ions deodorizing filter: UTR-FA13-2

1. Open the Intake Grille and remove the Air filters.

2. Replace them by two new Air cleaning filters.

  • Remove the old air cleaning filters in reverse order of their installation.
  • Install in the same way as for installation of the air cleaning filter set.

3. Install the two Air filters and close the Intake Grille

In regard to the Fujitsu air conditioner air filter:

POLYPHENOL CATECHIN AIR CLEANING FILTER (one sheet)

  • The Air Cleaning Filters are disposable filters. (They can not be washed and reused.)
  • For storage of the Air Cleaning Filters, use the filters as soon as possible after the package has been opened. (The air cleaning effect decreases when the filters are left in the opened package)
  • Generally, the filters should be exchanged about every three months.

Negative air ions deodorizing filter (one sheet) – light blue

  • The filters should be exchanged about every three years so as to maintain the deodorizing effect.
  • Filter frame is not a one-off product.

Maintenance of Deodorizing Filters

In order to maintain the deodorizing effect, please clean the filter in the follow way once three months.

  1. Remove the deodorizing filter.
  2. Clean with water and dry in the air.
  3. Reinstall the deodorizing filter.

You may also like