Fujitsu Trouble Shooting Guide
Current Models
Wired Remote Control Models
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 Fail Disch Sensor Fail 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
Inverter Multi AOY30
This has 4 LEDs A,B, C & D to denote which circuit has the fault
Up to 8 flashes - faults are identical to above 9-30 Single System
9 Pressure Switch A
10 Pressure Switch B
11 Indoor Unit Indexing Problem
12 IPM Fail
13 Compressor Position Fail
14 Compressor Fail
15 OD Fan Upper Fail
16 OD Fan Lower Fail
17 PCB Fail
Interconnecting Wiring
This has 4 LEDs A,B, C & D to denote which circuit has the fault
Up to 8 flashes - faults are identical to above 9-30 Single System
Live Neutral Comms
CO Multis 2 1 3
HP Multis 1 2 3
AOY90T 3 2 1
ALL OTHERS 1 or L 2 or N 3
We recommend external pumps have their own power supply.
Taking Power for a pump from the unit is a major source of Errors.
To Interrogate
When E:EE is displayed switch unit off and press the temp up and temp down
buttons simultaneously for 3 seconds.
To Return to Normal Operation
Press Temp Up and Temp Down Buttons together for 3 seconds.
To Initiate Test Operation
Switch Unit Off & Press Master & Fan Buttons together for 3 seconds.
Press Start/Stop to Initiate.
Changing the Sensor Position
The unit can sense the air temperature at the unit or controller
Turn Unit Off
To change press THERMOSENSOR button for 5 seconds to unlock
Toggle the THERMOSENSOR button & controller is displayed
Set to desired setting (unit or controller)
Press THERMOSENSOR button for 5 seconds to lock
Two Handsets/1 Unit – set on RC DIP SWs
Single handset DIP SW1 is On & 2 is Off
Dual Handset Master Both On & Slave both Off
Group Control up to 16 Unit from 1 RC Handset
Set DIP SW3 on RC to ON
Set Each ID Unit Rotary SW to Unit Address (0-15) in series
Auto Restart on Power Failure
DIP SW2-3 on ID Unit. Off is autorestart (std)/On is Manual Restart
Auto Changeover
DIP SW5 on RC. On is autochangeover (std)/Off is Manual
Memory Retention on Power Failure
Dip SW6 on RC. On is Memory/Off is no memory
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