VRF Trouble Shooting – Fujitsu

VRF Trouble Shooting – Fujitsu

Pipework
• Always check that the pipework follows the limitations in the corresponding user guides
• Use of dry nitrogen while brazing or when pipework open to atmosphere is vitale
• Always use a good electronic Torr gauge such as 617981 while evacuating
• If multiple indoor units are low on capacity, system is probably undercharged
• If one indoor unit is low on capacity, strainer is probably blocked
Outdoor Unit
• Gas pressures are frequently a bad guide to system gas charge
• Check the condensor coil is not blocked and airflow not impeded
• Make sure system is not over indexed if all indoor units are in the same area (inverter models)
Indoor Units & Heat Recovery (HR & RB) Boxes
• These items have pipework strainers which can, and do, block. Check these first.
• Temperature difference between return and supply air of 10C cooling/15C heating indicates system ok
• Always check condition of return air filters and clean if necessary
Controllers and Wiring
• All VRF systems have self diagnostics at the controller - see below
• Ensure control wiring is run in screened cable without exception (1mm 2 core CY suggested)
• Ensure screened cable is Earthed at one end only

Fault Diagnostic Codes
Fujitsu J Series and Airstage follow the fault codes below -
Indoor Fault Codes - access from handset • LED Codes refer to flash type

Handset = E:00
Red LED =
Green LED =
Yellow LED = No Fault Currently
Meaning =
Remedy = Run system again

Handset = E:02
Red LED = Rapid
Green LED = Rapid
Yellow LED = Model Abnormal
Meaning =
Remedy = Check DIP switches

Handset = E:03
Red LED = 5 times
Green LED = Rapid
Yellow LED = 2 times
Meaning = Processor Failure
Remedy = PCB failure

Handset = E:04
Red LED = Rapid
Green LED = Rapid
Yellow LED = Rapid
Meaning = Power Abnormal
Remedy = Swap 2 phases

Handset = E:06
Red LED = Rapid
Green LED = 4 times
Yellow LED = 1 TIme
Meaning = EEPROM Error
Remedy = PCB Failure

Handset = E:07
Red LED = Rapid
Green LED = 4 time
Yellow LED = 2 Times
Meaning = EEPROM Error
Remedy = PCB Failure

Handset = E:09
Red LED = 2 times
Green LED =
Yellow LED =
Meaning = Room Sensor Failure
Remedy = Check/Replace

Handset = E:0A
Red LED = 3 times
Green LED = Rapid
Yellow LED = 1 Time
Meaning = Middle Pipe Sensor Fail
Remedy = Check/Replace

Handset = E:0b
Red LED = 3 times
Green LED = Rapid
Yellow LED = 2 Times
Meaning = Inlet Pipe Sensor Fail
Remedy = Check/Replace

Handset = E:0C
Red LED = 3 times
Green LED = Rapid
Yellow LED = 3 Times
Meaning = Outlet Pipe Sensor Fail
Remedy = Check/Replace

Handset = E:0d
Red LED = 7 times
Green LED = Rapid
Yellow LED =
Meaning = Fan Temp Sensor Fail
Remedy = Check/Replace

Handset = E:11
Red LED = 4 times
Green LED = Rapid
Yellow LED =
Meaning = Drainage Failure
Remedy = Drains/Float Sw/Pump

Handset = E:12
Red LED = Rapid
Green LED = 7 times
Yellow LED =
Meaning = Room Temp too high/low
Remedy = Is unit over/Undersized

Handset = E:13
Red LED = 6 times
Green LED = Rapid
Yellow LED =
Meaning = Fan Failure
Remedy = Check filters/motor

Handset = E:18
Red LED = 5 times
Green LED = Rapid
Yellow LED = 1 or 4 Times
Meaning = Control Comms Failure
Remedy = Check Controller Wiring

Handset = E:1F
Red LED = Rapid
Green LED = 5 times
Yellow LED = 1 TIme
Meaning = Transmission Failure
Remedy = Check Control Wiring

Handset = E:20
Red LED = Rapid
Green LED = 5 times
Yellow LED = 2 Times
Meaning = Node Error
Remedy = Check Control Wiring

Handset = E:21
Red LED = Rapid
Green LED = 6 times
Yellow LED =
Meaning = Parralel Comms Error
Remedy = Check Control Wiring

Handset = E:32
Red LED = Rapid
Green LED = 7 times
Yellow LED =
Meaning = Outdoor Unit Error
Remedy = Check Outdoor Unit

Outdoor Codes - On Outdoor PCB • When LED1 flashes rapidly the other LEDS below -

LED = 1 flash
1 = Rapid
2 = Comp1 Fail
3 = Dis Sens1
4 = Dis Press
5 = Phase Fail
6 = ID Unit Fail

LED = 2 flashes
1 = Rapid
2 = Comp2 Fail
3 = Dis Sens2
4 = Liq Press
5 = Power Freq
6 = ID1 Fail

LED = 3 flashes
1 = Rapid
2 = Comp3 Fail
3 = Dis Sens3
4 =
5 = PCB Fail
6 = ID1 Fail

LED = 4 flashes
1 = Rapid
2 = Dis Temp1
3 = In Pipe1
4 = Comp Seize
5 = PCB Fail
6 = ID1 Fail

LED = 5 flashes
1 = Rapid
2 = Dis Temp2
3 = In Pipe2
4 = Hi Current
5 =
6 = ID1 Fail

LED = 6 flashes
1 = Rapid
2 = Dis Temp3
3 = In Pipe3
4 = CT Error
5 = PCB Fail
6 = ID1 Fail

LED = 7 flashes
1 = Rapid
2 = HP Trip
3 = Out Pipe1
4 = Oil Low
5 = PCB Fail
6 = ID1 Fail

LED = 8 flashes
1 = Rapid
2 = LP Trip
3 = Out Pipe2
4 =
5 = Comms Fail
6 = ID1 Fail

LED = 9 flashes
1 = Rapid
2 = Pump
3 = Out Pipe3
4 = L startup
5 = Comms Fail
6 =

LED = 10 flashes
1 = Rapid
2 = Down
3 = Suct Pipe
4 =
5 =
6 = ID1 Fail

LED = 11 flashes
1 = Rapid
2 = Error
3 = Air Sensor
4 =
5 =
6 =

If all PCB’s flash rapidly check DIP switch settings

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