Sooner or later, any air conditioner, even the one of the best quality, can break down. Malfunctions can be both serious, requiring expensive repairs, and minor ones, which can be prevented in the majority of cases with timely maintenance. Let’s consider the main types of breakdowns and possible ways of their repair.
Fujitsu Air Conditioner wall mounted Type Inverter Faults Codes
| Error | Indoor unit LED Operation LED | Indoor unit LED Timer LED | Wired remote control | Error |
|---|---|---|---|---|
| Serial signal error | Off | 2flash | 01 | Serial signal (reverse) error, at operation start up |
| 3 flash | 01 | Serial signal (reverse) error, during oeration | ||
| 4 flash | 13 | Serial signal (forward) error, at operation start up | ||
| 5 flash | 13 | Serial signal (forward) error, during operation | ||
| 8 flash | 00 | Wired remote control error | ||
| Indoor unit thermistor error | 2 flash | 2 flash | 02 | Indoor air thermistor error |
| 3 flash | 04 | Heat exchanger middle thermistor error | ||
| Outdoor unit thermistor error | 3 flash | 2 flash | 0C | Discharge pipe thermistor error |
| 3 flash | 06 | Heat exchanger thermistor error | ||
| 4 flash | 0A | Outdoor air thermistor error | ||
| Indoor unit control error | 4 flash | 2 flash | 20 | Manual auto button welded |
| 3 flash | - | Main relay welded | ||
| 4 flash | 2A | Not distinguishing 50 Hz or 60 Hz | ||
| Outdoor unit control error | 5 flash | 2 flash | 17 | Current trip error |
| 3 flash | 18 | CT abnormal | ||
| 5 flash | 1A | Compressor location detection error | ||
| 6 flash | 1B | Outdoor unit fan drive system abnormal | ||
| Indoor fan motor error | 6 flash | 2 flash | 12 | Abnormal lock (upper fan motor) |
| 3 flash | 12 | Abnormal rotation (upper fan motor) | ||
| Refrigerant cycle error | 7 flash | 2 flash | 0F | Discharge temperature abnormal |
| 3 flash | 24 | Cooling high pressure abnormal rise | ||
| 4 flash | 2C ? | DC 4-way valve and expansion valve abnormal | ||
| Optional function error | 8 flash | 2 flash | 19 | Active filter error (first) |
| 3 flash | 19 | Active filter error (second) | ||
| 4 flash | 25 | PFC circuit error | ||
| Model information error | 0.1 sec on/off | 0.1 sec on/off | 11 | Model information error |
Fujitsu Air Conditioner Inverter Split Type Faults Codes
| Fault Code | Error contents |
|---|---|
| 01 13 26 27 | Indoor signal error |
| 00 | Wired remote controller abnormal |
| 02 | Indoor room temperature sensor error |
| 04 | Indoor heat exchanger temperature sensor (middle) error |
| 28 | Indoor heat exchanger temperature sensor (inlet) error |
| 09 | Float switch operated |
| 0C | Outdoor discharge pipe temperature sensor error |
| 06 | Outdoor heat exchanger temperature sensor (outlet) error |
| 0A | Outdoor temperature sensor error |
| 15 | Compressor temperature sensor error |
| 1d | 2-way valve temperature sensor error |
| 1E | 3-way valve temperature sensor error |
| 29 | Outdoor heat exchanger temperature sensor (middle) error |
| 20 | Indoor manual auto switch abnormal |
| 2A | Power supply frequency detection error |
| 17 | IPM protection |
| 18 | CT error |
| 1A | Compressor location error |
| 1b | Outdoor fan error |
| 1F | Connected indoor unit abnormal |
| 1c | Outdoor unit computer communication error |
| 12 | Indoor fan abnormal |
| 0F | Discharge temperature error |
| 24 | Exessive high pressure protection on cooling |
| 2c | 4-way valve abnormal |
| 16 | Pressure switch abnormal |
| 2b | Compressor temperature error |
| 19 | Active filter abnormal |
| 25 | PFC circuit error |
| CO | Remote control error |
Outdoor unit
| LED | ERROR CONTENTS |
|---|---|
| FLASH (0.1sec ON/0.1sec OFF) | Temperature sensor error |
| FLASH (0.5sec ON/0.5sec OFF) | IPM protection |
| FLASH (2sec ON/2sec OFF) | Current trans. error |
| FLASH (5sec ON/5sec OFF) | Outdoor fan error |
| FLASH (0.1sec ON/2sec OFF) | Compressor rotor position cannot be detected |
| FLASH (5sec ON/0.1sec OFF) | ACTPM error |
| Lighting | Overheat discharge temperature protection |
Fujitsu Air Conditioner Hardwired Remote Controller System Error Codes
When EE:EE is displayed on remote control , press “Energy Save” & “Zone Control” buttons simultaneously for longer than 3 secs. The error code will then be displayed on the LCD.
| E0:00 | Coms error – indoor to remote |
|---|---|
| E1:00 | Coms error – indoor to outdoor |
| E2:00 | Return air thermistor open circuit |
| E3:00 | Return air thermistor short circuit |
| 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 themistor open |
| Ed:00 | Discharge pipe thermistor shorted |
| EE:00 | High Pressure problem |
| EF:00 | Discharge pipe temp. Problem – too high = short of gas |
Press “Energy Save” & “Zone Control” buttons simultaneously for longer than 3 secs to return to normal operating mode
(1) Stop the air conditioner operation.
(2) Press the master control button and the fan control button simultaneously for 2 seconds or more to start the test run
(3) Press the start/stop button to stop the test run
[SELF-DIAGNOSIS]
When the error indication E:EE is displayed, follow the following items
to perform the self-diagnosis. E:EE indicates an error has occurred.
1. REMOTE CONTROLLER DISPLAY
1) Stop the air conditioner operation.
2) Press the set temperature buttons simultaneously for 5 seconds or more to start the self-diagnosis.
Refer to the following tables for the description of each error code
(3) Press the set temperature buttons simultaneously for 5 seconds or more to stop the self-diagnosis
| Error code | Error contents |
|---|---|
| 00 | Communication error (indoor unit to remote controller) |
| 01 | Communication error (indoor unit to outdoor unit) |
| 02 | Room temperature sensor open |
| 03 | Room temperature sensor short-circuited |
| 04 | Indoor heat exchanger temperature sensor open |
| 05 | Indoor heat exchanger temperature sensor shortcircuited |
| 06 | Outdoor heat exchanger temperature sensor open |
| 07 | Outdoor heat exchanger temperature sensor shortcircuit |
| 08 | Power source connection error |
| 09 | Float switch operated |
| 0A | Outdoor temperature sensor open |
| 0b | Outdoor temperature sensor short-circuited |
| 0c | Discharge pipe temperature sensor open |
| 0d | Discharge pipe temperature sensor short-circuited |
| 0E | Outdoor high pressure abnormal |
| 0F | Discharge pipe temperature abnormal |
| 11 | Model abnormal |
| 12 | Indoor fan abnormal |
| 13 | Outdoor signal abnormal |
| 14 | Outdoor EEPROM abnormal |
Fujitsu air conditioning fault codes Wall Mounted Single Systems ASY, ASYA & ASYB
Includes AWYZ Nokria Models
| Red Light Operation | Green Light Timer | |
|---|---|---|
| Off | 2 Flashes | Reverse Comms Fail at Startup |
| 3 Flashes | Reverse Comms Fail In Use | |
| 4 Flashes | Forward Comms Fail at Startup | |
| 5 Flashes | Forward Comms Fail In Use | |
| 8 Flashes | Wired Remote Control Failure | |
| 2 Flashes | 2 Flashes | Indoor Air Sensor Fail |
| Indoor Pipe Sensor Fail | ||
| 3 Flashes | 2 Flashes OD | Disch Sensor Fail |
| 3 Flashes OD | Pipe Sensor Fail | |
| 4 Flashes OD | Air Sensor Fail | |
| 8 Flashes | Compressor Temp Sensor Fail | |
| 4 Flashes | 2 Flashes | Forced Auto Switch Welded |
| 3 Flashes | Main Relay Welded | |
| 4 Flashes | Power Failure | |
| 7 Flashes | VDD Permament Stop Protection | |
| 8 Flashes | Reverse VDD Permament Stop | |
| 5 Flashes | 2 Flashes | Current Trip |
| 3 Flashes | CT Abnormal | |
| 5 Flashes | Compressor Failure | |
| 6 Flashes | Outdoor Fan Failure | |
| 6 Flashes | 2 Flashes | ID Fan Motor Locked |
| 3 Flashes | ID Fan Motor Rotation Error | |
| 7 Flashes | 2 Flashes | High Discharge Temperature |
| 3 Flashes | High Pressure | |
| 5 Flashes | Pressure Switch Fail | |
| 8 Flashes | 2 Flashes | Active Filter AFM Fail 1st Time |
| 3 Flashes | Active Filter AFM Fail 2nd Time | |
| 4 Flashes | PFC Circuit Error | |
| Blinking | Blinking | PCB Failure |
All Other Wireless Indoor Units AUY, ABY & AWY Models Fujitsu air conditioning fault codes
Including Multi Systems (Not J Series or VRF)
| Red Light operation | Green Light Timer | Yellow Light Swing | Fail |
|---|---|---|---|
| On | Normal | ||
| Slow Blink | Slow Blink | Test | |
| Blinks | Blinks | Off | ID PCB Fail |
| Blinks | Blinks | OD PCB Fail | |
| 2 Pulses | Off | OD Power Connection Failure | |
| 3 Pulses | Off | OD Unit Pipe Sensor Fail | |
| 4 Pulses | Off OD | Unit Air sensor Fail | |
| 4 Pulses | Blinks | OD Unit Air sensor Short | |
| 5 Pulses | Off | OD Unit Disch Sensor Fail | |
| Blinks | OD Unit Disch Sensor Short | ||
| 6 Pulses | Off | High Pressure | |
| 7 Pulses | High Discharge or Compressor Temp | ||
| 9 Pulses | OD Unit Compressor Temp Sensor | ||
| 10 Pulses | IPM Error | ||
| 11 Pulses | CT Error | ||
| 12 Pulses | AFM Filter Error | ||
| 13 Pulses | Compressor Error | ||
| 14 Pulses | OD Fan Motor Fail | ||
| 2 Pulses | Blinks | Air Sensor Open | |
| Blinks | Air Sensor Closed | ||
| 3 Pulses | Off | Pipe Sensor Open | |
| Blinks | Pipe Sensor Closed | ||
| 4 Pulses | Off | Drain Problem | |
| 5 Pulses | Communication Error | ||
| Blinks | OD PCB or Wiring Error | ||
| 6 Pulses | Off | Indoor Fan Failure |
Fujitsu air conditioning fault codes Wall Mounted Multi Models
| Initial Display | ||
|---|---|---|
| Red | Green | Meaning |
| 2 Flashes | Blinks | ID Sensor Failure |
| 4 Flashes | ID Control Error | |
| 5 Flashes | Comms Failure | |
| 6 Flashes | ID Fan Failure | |
| Blinks | 2 Flashes | OD Thermistor Fail |
| 3 Flashes | Pressure Switch | |
| 4 Flashes | ID Units Incorrect | |
| 5 Flashes | Inverter Failure | |
Fujitsu air conditioning Wired Remote Control Models fault codes
Code Consists of Indoor Unit Address Followed by the Fault Code
Below. No E denotes No Fault
| OO | ID to RC Comms Fail |
|---|---|
| O1 | ID to OD Comms Fail |
| O2 | ID Air Sensor Open |
| O3 | ID Air Sensor Close |
| O4 | ID Pipe Sensor Open |
| O5 | ID Pipe Sensor Close |
| O6 | OD Pipe Sensor Fail |
| O8 | Power Source Connection Failure |
| O9 | Drain Problem Float switch operated |
| OA | OD Air Sensor Fail |
| OC | Discharge sensor Fail |
| OE | Outdoor High Pressure Heatsink error |
| 11 | OD PCB Fail |
| 12 | ID Fan Fail |
| 13 | OD Signal Abnormal ID signal error |
| 14 | OD EEPROM Fail |
| 15 | Compressor Temp Failure |
| 16 | Pressure Switch Error |
| 17 | IPM Error |
| 18 | CT Error |
| 19 | Active Filter Module Error |
| 1A | Compressor Failure |
| 1B | OD Fan Failure |
| 1C | Inverter to PCB Comms Fail |
| 1D | 2 Way Valve sensor Fail |
| 1E | Expansion Valve Error |
| 1F | Connection ID Unit Error |
| 20 | Indoor manual switch abnormal |
| 24 | Excessive high pressure protection on cooling |
| 25 | PFC circuit error |
| 26 | Indoor signal error |
| 27 | Indoor signal error |
| 28 | Indoor heat exchanger temperature error |
| 29 | Outdoor heat exchanger temperature (middle) error |
| 2A | Power supply frequency detection error |
| 2B | Compressor temperature error |
| 2C | Four-way valve abnormal |
Outdoor PCB Fault Codes
| Inverter OD Unit PCBs (1 red LED) | Non Inverter OD PCBs (2 red LEDs) | ||||
|---|---|---|---|---|---|
| OD PCB LED | LED 1 | LED 2 | |||
| Pulses | Models 9-30 | Models 36-54 | Blinks | Blinks | OD PCB Fail |
| 1 | Comms Failure | Comms Failure | 1 Pulse | Lift | Power Source Failure |
| 2 | Disch Sensor Fai | Disch Sensor Fai | 2 Pulses | Lift | OD Disch Temp Sensor |
| 3 | Pipe Sensor Fail | Pipe Sensor Fail | 3 Pulses | Lit | OD Pipe Sensor |
| 4 | Air Sensor Fail | Air Sensor Fail | 4 Pulses | Lit | OD Air Sensor |
| 5 | 2 Way Valve Sensor | 5 Pulses | Lit | Comms Failure | |
| 6 | 3 Way Valve Sensor | 6 Pulses | Lit | Indoor Unit Error | |
| 7 | Compressor Thermistor | Compressor Thermistor | 7 Pulses | Lit | High Discharge Temp |
| 8 | Pressure Switch | Heatsink Sensor Fail | 8 Pulses | Lit | High Pressure |
| 9 | Indoor Comms Error | Pressure Switch | 9 Pulses | Lit | Compressor Temp Abnormal |
| 10 | Current Trip | 10 Pulses | Lit | Compressor Temp Sensor Fail | |
| 11 | CT Fail | ||||
| 12 | Compressor Position Fail | IPM Error | |||
| 13 | Compressor Start Fail | Compressor Position Fail | |||
| 14 | Timer Failure | Compressor Start Fail | |||
| 15 | OD Upper Fan Fail | ||||
| 16 | OD Lower Fan Fail | ||||
| Slow Blink | Protect Operation |