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Fujitsu Trouble Shooting Guide
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
Outdoor PCB Fault Codes
Inverter OD Unit PCBs (1 red LED)
OD PCB LED
Pulses
Models 9-30
1
Comms Failure
2
Disch Sensor Fail
3
Pipe Sensor Fail
4
Air Sensor Fail
5
2 Way Valve Sensor
6
3 Way Valve Sensor
7
Compressor Thermistor
8
Pressure Switch
9
Indoor Comms Error
10
Current Trip
11
CT Fail
12
Compressor Position Fail
13
Compressor Start Fail
14
Timer Failure
15
16
Slow Blink
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
25
26
27
28
29
2A
2B
2C
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
Non Inverter OD PCBs (2 red LEDs)
LED 1
Models 36-54
Blinks
Comms Failure
1 Pulse
Disch Sensor Fail
2 Pulses
Pipe Sensor Fail
3 Pulses
Air Sensor Fail
4 Pulses
5 Pulses
6 Pulses
Compressor Thermistor
7 Pulses
Heatsink Sensor Fail
8 Pulses
Pressure Switch
9 Pulses
10 Pulses
IPM Error
Compressor Position Fail
Compressor Start Fail
OD Upper Fan Fail
OD Lower Fan Fail
Protect Operation
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
CO Multis
HP Multis
AOY90T
ALL OTHERS
We recommend external pumps have their own power supply.
Taking Power for a pump from the unit is a major source of Errors.
Current Models
PFC circuit error
Indoor signal error
Indoor signal error
Indoor heat exchanger temperature error
Outdoor heat exchanger temperature (middle) error
Power supply frequency detection error
Compressor temperature error
Four-way valve abnormal
LED 2
Blinks
OD PCB Fail
Lift
Power Source Failure
Lift
OD Disch Temp Sensor
Lit
OD Pipe Sensor
Lit
OD Air Sensor
Lit
Comms Failure
Lit
Indoor Unit Error
Lit
High Discharge Temp
Lit
High Pressure
Lit
Compressor Temp Abnormal
Lit
Compressor Temp Sensor Fail
Live
Neutral
2
1
1
2
3
2
1 or L
2 or N
Comms
3
3
1
3
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