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
| LED | Error |
|---|---|
| 1 flash | Communication error (Indoor unit – Outdoor unit) |
| 2 flash | Discharge pipe temperature sensor |
| 3 flash | Outdoor heat exchanger temperature (outlet) sensor |
| 4 flash | Outdoor temperature sensor |
| 5 flash | Outdoor heat exchanger temperature (mid) sensor |
| 6 flash | Discharge pipe temperature abnormal |
| 7 flash | Compressor temperature sensor |
| 8 flash | Heat sink temperature sensor |
| 9 flash | Pressure switch abnormal |
| 10 flash | Compressor temperature abnormal |
| 12 flash | IPM error |
| 13 flash | Compressor rotor position cannot detect |
| 14 flash | Compressor cannot operate |
| 15 flash | Outdoor fan abnormal (upper fan) |
| 16 flash | Outdoor fan abnormal (lower fan) |
| 5 sec on/ 0.1 sec off repeat | PAM voltage abnormality |
| 5 sec on/ 1 sec off repeat | Protect operation |
| 5 sec on/ 2 sec off repeat | PFC surge protection (permanent stop) |
| 5 sec on/ 5 sec off repeat | Fan malfunction |
| 2 sec on/ 2 sec off repeat | CT abnormality |
| 2 sec on/ 5 sec off repeat | Compressor temperature protection (permanent stop) |
| 1 sec on/ 1 sec off repeat | Pump down operation |
| 0.5 sec on/ 0.5 sec off repeat | Current surge protection |
| 0.1 sec on/ 0.1 sec off repeat | Thermistor malfunction |
| 0.1 sec on/ 2 sec off repeat | Compressor position detection malfunction |
| off | No error |
Troubleshooting at the indoor unit display
Error is displayed on the wired and wireless remote control. Lamps show error contents by flashing as follows.
| OPERATION Lamp | TIMER Lamp | FILTER Lamp | Possible Errors |
| off | 2 times | off | Indoor signal error |
| off | 3 times | off | Indoor signal error |
| off | 4 times | off | Indoor signal error |
| off | 5 times | off | Indoor signal error |
| off | 8 times | off | Wired remote controller abnormal |
| 2 times | 2 times | off | Indoor room temperature sensor error |
| 2 times | 3 times | off | Indoor heat exchanger temperature sensor (middle) error |
| 2 times | 4 times | off | Indoor heat exchanger temperature sensor (inlet) error |
| 2 times | 6 times | off | Float switch operated |
| 3 times | 2 times | off | Outdoor discharge pipe temperature sensor error |
| 3 times | 3 times | off | Outdoor heat exchanger temperature sensor (outlet) error |
| 3 times | 4 times | off | Outdoor temperature sensor error |
| 3 times | 7 times | off | Heat sink thermistor (Inverter) error |
| 3 times | 8 times | off | Compressor temperature sensor error |
| 3 times | off | 2 times | 2-way valve temperature sensor error |
| 3 times | off | 3 times | 3-way valve temperature sensor error |
| 3 times | off | 4 times | Outdoor heat exchanger temperature sensor (middle) error |
| 3 times | off | 5 times | Heat sink thermistor (P.F.C) error |
| 4 times | 2 times | off | Indoor manual auto switch abnormal |
| 4 times | 4 times | off | Power supply frequency detection error |
| 5 times | 2 times | off | IPM protection |
| 5 times | 3 times | off | CT error |
| 5 times | 5 times | off | Compressor location error |
| 5 times | 6 times | off | Outdoor fan error |
| 5 times | 7 times | off | Connected indoor unit abnormal |
| 5 times | 8 times | off | Outdoor unit computer communication error |
| 5 times | off | 2 times | Inverter error |
| 6 times | 2 or 3 times | off | Indoor fan abnormal |
| 7 times | 2 times | off | Discharge temperature error |
| 7 times | 3 times | off | Excessive high pressure protection on cooling |
| 7 times | 4 times | off | 4-way valve abnormal |
| 7 times | 5 times | off | Pressure switch abnormal, Pressure sensor abnormal |
| 7 times | 6 times | off | Compressor temperature error |
| 7 times | 7 times | off | Low pressure error |
| 8 times | 2 or 3 times | off | Active filter abnormal |
| 8 times | 4 times | off | PFC circuit error |
| 8 times | 6 times | off | P.F.C PCB error |
| 9 times | 2 times | off | Refrigerant circuit address set-up error |
| 9 times | 3 times | off | Master unit, Slave unit set-up error |
| 9 times | 4 times | off | Connected 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
- 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
- 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
-
Open the Intake Grille, and remove the air filter.
Lift up the air filter’s handle, disconnect the two lower tabs, and pull out air filter handle.
-
Remove dust with a vacuum cleaner or by washing.
After washing, allow to dry thoroughly in a shaded place.
-
Replace the Air Filter and close the Intake Grille.
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.
- Remove the deodorizing filter.
- Clean with water and dry in the air.
- Reinstall the deodorizing filter.
Hope that this guide help you. If still need help in aircon servicing, please feel free to get in touch.
