Fujitsu AO G18KBTB Series Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
Cassette type
Models Indoor unit Outdoor unit
AUXG18KRLB
AUXG22KRLB
RCG18KRLB
RCG22KRLB
AO*G18KBTB
AO*G22KBTB
ROG18KBTB
ROG22KBTB
INVERTER
SERVICE
INSTRUCTION

2 . TROUBLE SHOOTING
CASSETTE type
INVERTER

Indoor Room Thermistor Error
Wired Remote Controller
Communication Error
Error Contents Trouble
shooting
02-01
2 ERROR DISPLAY
2-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY
Serial Communication Error
External communication Error
Combination Error
Indoor unit address setting Error
Connection unit number Error
(Indoor unit Wired remote controller Error)
Indoor Unit Fan Motor Error
Indoor Heat Ex. Thermistor Error
Drain pump Error
1,2
3
5
6
7
8
10
18
12
13
14
15
16
17
19
21
20
22
24
25
Trip terminal L Error
Error
Code Error Contents Trouble
shooting
Error
Code
11
12
39
41
Manual auto switch Error 11
35
42
51
53
63
18
23
29
26
33
3A
62
64
65
71
73
74
Indoor unit power supply Error
for fan motor
Indoor unit Communication circuit
(wired remote controller) Error
Indoor unit motor electricity
consumption detection Error
932
Indoor unit PCB model
information Error
Inverter Error
Outdoor unit main PCB model
information error
27
29
30
31
32
33
84
94
95
97
99
A1
Trip detection
Discharge Thermistor Error
Outdoor Thermistor Error
Current sensor Error
Heat Ex. Outlet / Middle
Thermistor Error
Compressor rotor position
detection Error
Outdoor Unit Fan Motor Error
4-way Valve Error
Discharge Temp. Error
PFC circuit Error
1. If an error occurs, an error icon appears on the “Monitor mode screen”.
Touch the [Status] on the “Monitor mode screen”.The “Status” screen is displayed.
2. Touch the [Error Information] on the “Status”screen. The “Error Information”screen is displayed.
(If there are no errors, the [Error Information] will not be displayed.)
3. 2-digit numbers correspond to the error code in the table below. Touch the [Next page]
(or [Previous page]) to switch to other connected indoor units.
For the details of the indoor unit or outdoor unit error , refer to the error codes in each installation manual
Mode Set Temp.
Fri 10:00AM
Menu Monitor Back
Page 1/ 4 Page 1/ 5
Air Flow Direction
Economy
VT
Individual Error Code
Address
[ 1 ] [ 02 01 ]
[ 14 . 15, 41 . 44 ]
[ ]
[ Off ]
Next
Page
Next
Page
Error
Information
Status
Status
Error Information
Fan
!
1. 2. 3.
Check the Error code on the wired remote controller (Remote controller *Option)
Check the Error LED display on the Indoor unit (IR Receiver *Option )
1. Check ECONOMY (Green) LED Blinking, it means the Error on the system. (Not brinking: No Error)
2. Count OPERATION (Green) LED blinks: The number of blinking means the first digit of Error code.
3. Count TIMER (Orange) LED blinks: The number of blinking means the second digit of Error code.
Ex.) ECONOMY: Blinking continuous / OPERATION: 4 times / TIMER: 1 time Indoor Room Thermistor Error

02-02
Trouble shooting 1
OUTDOOR UNIT Error Method:
Detective Actuators: Detective details:
Forecast of Cause:
OK
Indicate or Display:
YESYES
NO
OK
1. Connection failure 2. External cause 3. Main PCB failure 4. Outdoor unit fan motor failure
Check Point 1-1 : Reset the power and operate
Does Error indication show again?
Check Point 1-2: Check external cause such as noise
Check the complete insulation of the grounding.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).
Check Point 2 : Check Connection
Check any loose or removed connection line of
Indoor unit and Outdoor unit.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check Point 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC198V (AC220V -10%) - 264V (AC240V +10%) appears
at Outdoor Unit Terminal L - N.
Check Point 4 : Check Serial Signal (Reverse Transfer Signal)
Check Serial Signal (Reverse Transfer Signal)
>> Check if Indicated value swings between AC90V and AC270V at Outdoor Unit Terminal 1 - 3.
>> If it is abnormal, Check Outdoor unit fan motor (PARTS INFORMATION 5)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Outdoor fan motor is normal, replace Main PCB.
When the indoor unit cannot receive the serial signal from Outdoor unit
more than 2minutes after power ON, or the indoor unit cannot receive
the serial signal more than 15seconds during normal operation.
2-2 TROUBLE SHOOTING WITH ERROR CODE
Serial communication error
(Serial Reverse Transfer Error)
Outdoor unit Main PCB
Outdoor unit fan motor
Error code : 11 Outdoor unit : No indication
AC
AC
+
-
AC
1
2
3
L
N
RED
WHITE
BLACK
BLACK
WHITE

02-03
Trouble shooting 2
INDOOR UNIT Error Method:
Detective Actuators: Detective details:
Forecast of Cause:
OK
Indicate or Display:
YESYES
NO
+
-
OK
1. Connection failure 2. External cause 3. Controller PCB failure
Check Point 1-1 : Reset the power and operate
Does Error indication show again?
Check Point 1-2: Check external cause such as noise
Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).
Check Point 2 : Check Connection
Check any loose or removed connection line of
Indoor unit and Outdoor unit.
Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check Point 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC198V (AC220V -10%) - 264V (AC240V +10%) appears
at Outdoor Unit Terminal L - N.
Check Point 4 : Check Serial Signal (Forward Transfer Signal)
Check Serial Signal (Forward Transfer Signal)
>> Check if indicated value swings berween AC30v and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.
When the outdoor unit cannot properly receive the serial signal from
indoor unit for 10 seconds or more.
Serial communication error
(Serial Forward Transfer Error)
Indoor unit Controller PCB
Error code : 11 Outdoor unit : No indication
AC
AC
AC
1
2
3
L
N
RED
WHITE
BLACK
BLACK
WHITE

02-04
Trouble shooting 3
INDOOR UNIT Error Method:
Detective Actuators: Detective details:
Forecast of Cause:
OK
Indicate or Display:
1. Connection failure 2. Wired Remote Controller failure 3. Controller PCB failure
Check Point 1 : Check the connection of terminal
After turning off the power.
Upon receiving the signal more than 1 time from Wired Remote or other Indoor
unit, but the same signal has not been received more than 1 minute
(3 Wire type), 2.5 minute (2 Wire type)
Wired Remote Controller
Communication Error
Indoor unit Controller PCB
Wired Remote Controller
Error code : 12 Outdoor unit : No indication
Check the connection of terminal berween Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
Check & correct the followings.
Check Point 1-2 : Check Wired Remote Controller and Controller PCB
Check Voltage at CN14 of Controller PCB. (Terminal 1-3, Terminal 1-2)
(Power supply for the Remote Control)
>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB
Check Point 2 : Wire installation Wrong RCgroup setting
Wrong wire connection in RCgroup (Please refer to the installation manual)
The number of connecting indoor unit and Remote controller in one RCgroup were less than 16 units.
Check if controller PCB damage.
Change controller PCB and check the Error after setting remote controller address.
DC
Check Point 2-1 : Check Indoor unit controller PCB

Trouble shooting 5
INDOOR UNIT Error Method:
External communication error
Detective Actuators: Detective details:
Forecast of Cause :
OKOK
External communication error
Check any loose or removed connection of between the controller PCB to the external I/OPCB
>>If there is an abnormal condition, correct it by refer to installation manual or
the technical manual.
Check the condition condtion on the external I/O PCB and the controller PCB
(If there is loose connector, open cable or mis-wiring)
After receiving a signal from the external I/O PCB,
the same a signal has not been received for 15sec
1. Connection failure 2.External I/O PCB failure 3.Controller PCB failure
Check Point 1 : Check the connection
Check Point 2: Replace external I/O PCB
If Check Point 1 do not improve the symptom, change External I/O PCB.
OKOK
Check Point 3: Replace Controller PCB
If Check Point 2 do not improve the symptom, change Controller PCB.
Indicate or Display:
Error code : 18
02-06
Outdoor unit : No indication

Trouble shooting 6
INDOOR UNIT Error Method:
Detective Actuators: Detective details:
1. The outdoor unit receives the serial signal of applied refrigerant
information from Indoor unit. When the refrigerant is R410a.
2. When the outdoor unit type is multi.
Forecast of Cause:
OK
Combination error
Indoor unit
1. The selection of indoor units is incorrect
Check Point 1 : Check the type of indoor unit
Check the type of the connected indoor unit.
>> If abnormal condition is found, correct it.
Check Point 2 : Replace Main PCB
If Check Point 1 do not improve the symptom, replace Main PCB of Outdoor unit.
Indicate or Display:
Error code : 23
02-07
Outdoor unit : No indication

Detective Actuators:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Detective details:
When the address number set by auto setting and manual setting are
mixed in one RC group.
When the duplicated address number exists in one RC group.
Check Point 3 : Check Indoor unit controller PCB
Forecast of Cause :
1. Wrong wiring of RCgroup 2. Wrong remote address setting 3. Indoor unit controller PCB failure
4. Remote controller failure
Check Point 1 : Wire installation
Wrong wire connection in RCgroup (Please refer to the installation manual)
Change controller PCB and check the Error after setting remote controller address
Check if controller PCB damage
Check Point 2 : Wrong RCgroup setting
The given address number by auto setting (00) and the manual set number (Except 00)
were not existing in one RCG.
The remote controller address setting by U.I. were not existing same address.
The duplicated address number is not existing in one RCgroup
Trouble shooting 7
INDOOR UNIT Error Method:
Indoor unit address setting error
Indicate or Display:
Error code : 26
02-08
Outdoor unit : No indication
OK
OK

02-09
Trouble shooting 8
INDOOR UNIT Error Method:
Connection unit number error (Indoor
unit in Wired remote controller system)
Detective Actuators:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Detective details:
When the number of connecting indoor units are out of specified rule.
Forecast of Cause :
1. Wrong wiring / Number of I.U, RC in RCgroup 2. Indoor unit controller PCB defective
Check Point 1 : Wire installation
Wrong number of connecting indoor unit
Check Point 2 : Check Indoor unit controller PCB
Check if controller PCB damage
Check if controller PCB and check the Error after setting remote controller address
Indicate or Display:
Error code : 29 Outdoor unit : No indication
OK