Fujitsu Trouble Shooting Guide
Current Models
These pages cover the current Inverter product range.
They also cover the ARY60U, ARY54U Single and AOY19/24F/U Multi Systems.
Trouble Shooting
Models with Wireless Controllers Trouble Shooting from the Indoor Unit
Wall Mounted Single Systems ASY, ASYA & ASYB
Includes AWYZ Nokria Models
All Other Wireless Indoor Units AUY, ABY & AWY
Models. Including Multi Systems (Not J Series or VRF)
Red Light
Operation
Green Light
Timer
Current Models
Red Light Green
Yellow
Operation Light Timer Light Swing
Off
Off
Off
Off
Off
2 Flashes
2 Flashes
2 Flashes
2 Flashes
3 Flashes
3 Flashes
3 Flashes
3 Flashes
3 Flashes
4 Flashes
4 Flashes
4 Flashes
4 Flashes
4 Flashes
5 Flashes
5 Flashes
5 Flashes
5 Flashes
6 Flashes
6 Flashes
7 Flashes
7 Flashes
7 Flashes
7 Flashes
7 Flashes
8 Flashes
8 Flashes
8 Flashes
Blinking
2 Flashes
3 Flashes
4 Flashes
5 Flashes
8 Flashes
2 Flashes
3 Flashes
4 Flashes
6 Flashes
2 Flashes
3 Flashes
4 Flashes
7 Flashes
8 Flashes
2 Flashes
3 Flashes
4 Flashes
7 Flashes
8 Flashes
2 Flashes
3 Flashes
5 Flashes
6 Flashes
2 Flashes
3 Flashes
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
2 Flashes
3 Flashes
4 Flashes
Blinking
Reverse Comms Fail at Startup
Reverse Comms Fail In Use
Forward Comms Fail at Startup
Forward Comms Fail In Use
Wired Remote Control Failure
Indoor Air Sensor Fail
Indoor Pipe Sensor Fail
Indoor heat exchanger sensor error
Float switch operated
OD Disch Sensor Fail
OD Pipe Sensor Fail
OD Air Sensor Fail
Heatsink Sensor Error
Compressor Temp Sensor Fail
Forced Auto Switch Welded
Main Relay Welded
Power Failure
VDD Permament Stop Protection
Reverse VDD Permament Stop
IPM Protection
CT Abnormal
Compressor Failure
Outdoor Fan Failure
ID Fan Motor Locked
ID Fan Motor Rotation Error
High Discharge Temperature
High Pressure
4-Way valve abnormal
Pressure Switch Fail
Compressor Temperature error
Active Filter AFM Fail 1st Time
Active Filter AFM Fail 2nd Time
PFC Circuit Error
PCB Failure
On
On
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
2 Pulses
2 Pulses
3 Pulses
3 Pulses
4 Pulses
5 Pulses
5 Pulses
6 Pulses
Slow Blink
Blinks
Blinks
2 Pulses
3 Pulses
4 Pulses
4 Pulses
5 Pulses
5 Pulses
6 Pulses
7 Pulses
9 Pulses
10 Pulses
11 Pulses
12 Pulses
13 Pulses
14 Pulses
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Slow Blink
Off
Blinks
Off
Off
Off
Blinks
Off
Blinks
Off
Off
Off
Off
Off
Off
Off
Off
Off
Blinks
Off
Blinks
Off
Off
Blinks
Off
Normal
Test
ID PCB Fail
OD PCB Fail
OD Power Connection Failure
OD Unit Pipe Sensor Fail
OD Unit Air Sensor Fail
OD Unit Air Sensor Short
OD Unit Disch Sensor Fail
OD Unit Disch Sensor Short
High Pressure
High Discharge or Compressor Temp
OD Unit Compressor Temp Sensor
IPM Error
CT Error
AFM Filter Error
Compressor Error
OD Fan Motor Fail
Air Sensor Open
Air Sensor Closed
Pipe Sensor Open
Pipe Sensor Closed
Drain Problem
Communication Error
OD PCB or Wiring Error
Indoor Fan Failure
Wall Mounted Multi Models
Initial Display
Red
2 Flashes
2 Flashes
4 Flashes
4 Flashes
5 Flashes
5 Flashes
6 Flashes
6 Flashes
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Further Interrogation by Pressing Test Button on Infra Red RC
Green
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
2 Flashes
2 Flashes
2 Flashes
2 Flashes
2 Flashes
2 Flashes
3 Flashes
4 Flashes
5 Flashes
5 Flashes
Meaning
ID Sensor Failure
ID Sensor Failure
ID Control Error
ID Control Error
Comms Failure
Comms Failure
ID Fan Failure
ID Fan Failure
OD Thermistor Fail
OD Thermistor Fail
OD Thermistor Fail
OD Thermistor Fail
OD Thermistor Fail
OD Thermistor Fail
Pressure Switch
ID Units Incorrect
Inverter Failure
Inverter Failure
Red
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
2 Flashes
4 Flashes
6 Flashes
8 Flashes
9 Flashes
10 Flashes
2 Flashes
2 Flashes
2 Flashes
5 Flashes
Green
2 Flashes
3 Flashes
2 Flashes
4 Flashes
2 Flashes
3 Flashes
2 Flashes
3 Flashes
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Blinks
Meaning
ID Air Sensor
ID Pipe Sensor
Manual Auto Button Error
Power Source Failure
Reverse Comms Failure
Forward Comms Failure
Motor locked
Motor RPM Incorrect
OD Discharge Sensor Fail
OD Pipe Sensor Fail
OD Air Sensor Fail
Compressor Temp Sensor Fail
2 Way Valve Sensor Fail
3 Way Valve Sensor Fail
Pressure Switch
Incorrect Indoor Unit Index
IPM Failure
Compressor Failure
www.climatecenter.co.uk
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
O1
O2
O3
O4
O5
O6
O8
O9
OA
OC
OE
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
20
24
ID to RC Comms Fail
ID to OD Comms Fail
ID Air Sensor Open
ID Air Sensor Close
ID Pipe Sensor Open
ID Pipe Sensor Close
OD Pipe Sensor Fail
Power Source Connection Failure
Drain Problem Float switch operated
OD Air Sensor Fail
Discharge sensor Fail
Outdoor High Pressure Heatsink error
OD PCB Fail
ID Fan Fail
OD Signal Abnormal ID signal error
OD EEPROM Fail
Compressor Temp Failure
Pressure Switch Error
IPM Error
CT Error
Active Filter Module Error
Compressor Failure
OD Fan Failure
Inverter to PCB Comms Fail
2 Way Valve sensor Fail
Expansion Valve Error
Connection ID Unit Error
Indoor manual switch abnormal
Excessive high pressure protection on cooling
25
26
27
28
29
2A
2B
2C
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
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
Outdoor PCB Fault Codes
Non Inverter OD PCBs (2 red LEDs)
OD PCB LED
Pulses
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Slow Blink
Models 9-30
Comms Failure
Disch Sensor Fail
Pipe Sensor Fail
Air Sensor Fail
2 Way Valve Sensor
3 Way Valve Sensor
Compressor Thermistor
Pressure Switch
Indoor Comms Error
Current Trip
CT Fail
Compressor Position Fail
Compressor Start Fail
Timer Failure
Models 36-54
Comms Failure
Disch Sensor Fail
Pipe Sensor Fail
Air Sensor Fail
Compressor Thermistor
Heatsink Sensor Fail
Pressure Switch
LED 1
LED 2
Blinks
1 Pulse
2 Pulses
3 Pulses
4 Pulses
5 Pulses
6 Pulses
7 Pulses
8 Pulses
9 Pulses
10 Pulses
Blinks
Lift
Lift
Lit
Lit
Lit
Lit
Lit
Lit
Lit
Lit
OD PCB Fail
Power Source Failure
OD Disch Temp Sensor
OD Pipe Sensor
OD Air Sensor
Comms Failure
Indoor Unit Error
High Discharge Temp
High Pressure
Compressor Temp Abnormal
Compressor Temp Sensor Fail
IPM Error
Compressor Position Fail
Compressor Start Fail
OD Upper Fan Fail
OD Lower Fan Fail
Protect Operation
Inverter Multi AOY30
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
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
10
11
12
13
14
15
16
17
Pressure Switch A
Pressure Switch B
Indoor Unit Indexing Problem
IPM Fail
Compressor Position Fail
Compressor Fail
OD Fan Upper Fail
OD Fan Lower Fail
PCB Fail
www.climatecenter.co.uk
CO Multis
HP Multis
AOY90T
ALL OTHERS
Live
2
1
3
1 or L
Neutral
1
2
2
2 or N
Comms
3
3
1
3
We recommend external pumps have their own power supply.
Taking Power for a pump from the unit is a major source of Errors.
Trouble Shooting
Inverter OD Unit PCBs (1 red LED)
Fujitsu Trouble Shooting Guide
A General Guide
Pipework
Outdoor Unit
• Pipe sizes and lengths should be as the
relevant Technical Guide
• Discharge temperature should be
between 50 & 70°C
• Both lines should be insulated
• Suction temperature should be
between -3 & 4°C
• No line accessories or oil traps should
be fitted
• If fan switches off check for high
discharge temperature
• In cooling mode both pipes should be
between 0 and 10°C - the suction line
should sweat, but not freeze
• Check Suction Line is sweating –
problem if not!
• Hot Recip. Compressor = PROBLEM!
• In heating moded both pipes should be
between 30 and 60°C
• Sweating/Frost on expansion line –
undercharged
• Pipework should be refrigeration quality
• Refrigerant should be R22, unless
stated on the outdoor unit
• Look for restrictions. They could cause
compressor failures.
Indoor Unit
Controller
Wiring
• Is it level? Have we adequate drainage?
• EE:EE on LCD handset –
fault diagnostics – see over
• In general interconnecting wiring is
240 Volt, but see chart for details
• Is the handset too far away?
• With LCD wired handset models,
Terminal 3 is the Live Not Terminal 1
• Smells are always due to site conditions
or drains
• Flashing lights? = Fault Diagnostics –
see over
• When were the batteries
changed last?
• When were the filters last cleaned?
• Heat Pump models 7-14 –
NOT auto changeover
• Is the unit too large/small
(between 5/20 air circs / hr)
NEVER apply mains voltage to
Terminal 1 on these models
• Timer is one shot, unless it has
‘repeat’ mode
• Is it on Timer/ Test Mode
Trouble Shooting
• With wired handset, check
for interference. Cable should
be screened
• Is it on Timer/ Test Mode
• With LCD wired handset models
wiring should be screened
• Check Voltage drops! Check it isn’t
down to Earth!
• Has it got a timeclock/BMS
interface?
• Interconnecting cables MUST be
circular crimped
What the separate wires do in the interconnecting cables
Note – Wires are 240V Live except where marked neutral or Earth or signal.
Cables marked Signal are digital pulses and you should not attempt to measure these with a meter.
E
N
L
1
2
3
4
5
6
ASY7-12A
Wire
Earth
Neutral
Comp+Fan
Unused
Unused
Unused
Unused
Unused
Unused
ASY7-12R
Earth
Neutral
Comp
Unused
Unused
Rev Valve
OD Fan
Unused
Unused
ASY13PS
Earth
Neutral
Line to OD
Unused
Unused
Signal
Unused
Unused
Unused
ASY14A & ABY14-24A
Earth
Unused
Unused
Neutral
Comp+Fan
Unused
Unused
Unused
Unused
ASY17-30A
Earth
Unused
Unused
Live to In
Neutral
Comp+Fan
Unused
Unused
Unused
ASY14-17R & ABY14R
Earth
Unused
Unused
Neutral
Comp
Rev Valve
OD Fan
Unused
Unused
ASY20-30R & ABY18-24R
Earth
Unused
Unused
Neutral
Comp
Fan Hi
Rev Valve
Fan Low
Unused
AUY12-18AG
Earth
Unused
Unused
Neutral
Comp
Fan Hi
Fan Low
Unused
Unused
AUY12-18RG
Earth
Unused
Unused
Neutral
Comp
Fan Hi
Rev Valve
Fan Low
Unused
AUY18-54A, ABY30-54A & ARY24-60A
Earth
Unused
Unused
Comp
Neutral
Live to In
Unused
Unused
Unused
AUY18-54R, ABY30-54R & ARY24-60R
Earth
Unused
Unused
Signal
Neutral
Live to In
Unused
Unused
Unused
Technical Support:
08705 218218
www.climatecenter.co.uk
Fujitsu Trouble Shooting Guide
Current Models
Wired Controllers – Fault diagnostics
A Fault Condition is signalled by EE:EE appearing on the
LCD panel. The unit should be interrogated by switching it
off on the handset then pressing either the down arrows on
the SET TIME and TEMP/DAY buttons together for 3 seconds
for 7 day models or the ENERGY SAVE & ZONE CONTROL
buttons for other models. The Failure code is in 2 parts –
Fault and Address. The Fault Code is an E code. The second
is the unit address for multi linked systems – with single
units this is always 00. 7 day models have the fault code as
shown in the table below above the address. Other models
have the codes below, minus the 0, followed by the address –
e.g. E9:00 denoting Float Switch on Unit 0.
Code
Fault
Diagnosis
E:0
E:01
E:02
E:03
E:04
E:05
E:06
E:07
E:08
E:09
E:0A
E:0C
E:0D
E:0F
I/U - R/C Comms
I/U - O/U Comms
Room Sensor Open
Room Sensor Short
I/U Pipe Sensor Open
I/U Pipe Sensor Short
O/U Pipe Sensor Open
O/U Pipe Sensor Short
Power Source Error
Float Switch
O/U Air Sensor Open
Disch Sensor Open
Disch Sensor Short
High Disch Temp
Check R/C wiring. Interference?
Check intercon. wiring. Interference
Sensor Missing
Sensor Faulty
Sensor Missing
Sensor Faulty
Sensor Missing
Sensor Faulty
Incorrect Power Supply
Check Drains - High Water Level
Sensor Missing
Sensor Missing
Sensor Faulty
Contamination In Pipework/
Gas Shortage
E:11
E:12
E:13
E:14
Model Abnormal
Indoor Fan Failure
O/D Signal Abnormal
Outdoor PCB Fail
Check PCB compatability
Check Fan and Motor
Communications?
PCB Failure
Fault
Outdoor Unit with
A fault condition is signified by flashing red LED’s on the the
outdoor PCB if it is equipped with one. Except for multisplits
and 2 LED models, the diagnostics are shown in the table on
the right. For 2 LED models flashing signifies sensor failure
and constantly lit indicates high discharge temperature.
LED1
Signal Failure
Indoor Unit Failure
Discharge Sensor Fail
O/D Pipe Sensor Fail
O/D Air Sensor Fail
Power Source Error
PCB
PCB Failure
High Pressure Trip
Discharge Temp Trip
LED2
LED3
LED4
LED5
LED6
Flash
Flash
Flash
Flash
Flash
Flash
Flash
Flash
Flash
Flash
All Flashing Very Rapidly
Flash
Flash
Flash
Flash
Flash
Models with wireless handsets
have three LED’s on the units
which light up to show operational,
or fault conditions. In general the
codes are as right, but there are
other codes available.
Model References are
A=ASY7A /R
B=ASY9/12A/R
C=ASY14/17A /R
D=ASY20/30/A /R
ABY14-24A /R & AUY12/18AG/RG
E=ABY36/45A
F=ABY36/45R
G=AUY18/45A
Unit
Code Means:-
Red
Green
Yellow
All
All
All
All
All
D,E,F
All
G
A,B,G
D,E,F
E,F
C
D,E,F
E,F
D,E,F
F
G
B,E,F
F
C
F OD
F OD
F OD
F OD
F
F
F
F
Power On
Timer Mode
Louvre On
HP Defrost Cont.
Test
Power Fail
PCB Failure
Room Sensor Fault
Sensor Fault
Room Sensor Open/Fail
Room Sensor Short
Room Sensor Fault
Pipe Sensor Open
Pipe Sensor Short
High Water
Comms Failure
High Water
Fan Failure
3ph Reversal
Pipe Sensor Fault
Pipe Sensor Open
Pipe Sensor Short
Temp Sensor Open
Temp Sensor Short
Discharge Sensor Open
Discharge Sensor Short
High/Low Pressure
High Discharge Temp
On
On
On
Long pulses
Cont. Pulse
On
Cont. Short Pulse
1 Short Pulse
2 Short Pulses
2 Short Pulses
2 Short Pulses
3 Short Pulses
3 Short Pulses
3 Short Pulses
4 Short Pulses
5 Short Pulses
6 Short Pulses
6 Short Pulses
Rapid Pulse
Long Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse 7
Off
On
On or Off
Off
Cont. Pulse
Cont Long
Cont. Short Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Long Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
Rapid Pulse
2 Short Pulses
3 Short Pulses
3 Short Pulses
3 Short Pulses
4 Short
4 Short Pulses
5 Short Pulses
5 Short Pulses
6 Short Pulses
Short Pulses
Off
Off
On
Off
Off
Pulses Off
Off
Off
Off
Off
Rapid Pulse
Off
Off
Rapid Pulse
Off
Off
Off
Off
Off
Off
Off
Rapid Pulse
Pulses Off
Rapid Pulse
Off
Rapid Pulse
Off
Off
Sensor Resistances – Use to Check Thermistors across the range
Sensor
Air Temperature Sensors
Indoor Pipe Sensor
Outdoor Pipe Sensor
Discharge Sensor
www.climatecenter.co.uk
At 10°C
At 20°C
At 30°C
20K Ohms
103K Ohms
10K Ohms
646K Ohms
13K Ohms
63K Ohms
6K Ohms
395K Ohms
8K Ohms
40K Ohms
4K Ohms
250K Ohms
Trouble Shooting
Wireless Remote Control Models – Diagnostics