Serial Communication Error; (Serial Reverse Transfer Error) - Fujitsu AS G18KMTA Series Service Instruction

2-2 TROUBLESHOOTING WITH ERROR CODE
Trouble shooting 1
OUTDOOR UNIT Error Method:

Serial communication error

(Serial Reverse Transfer Error)

Detective Actuators:
Outdoor unit Main PCB
Outdoor unit fan motor
Forecast of Cause:
1.Connection failure
Check Point 1-1 : Reset the power and operate
Does Error indication show again?
YES YES
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.
OK
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.
OK
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.
1
BLACK
2
WHITE
RED 3
L
BLACK
N
WHITE
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 11]
Detective details:
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. External cause 3. Main PCB failure
NO
AC
+
-
02-10
: Operation lamp: 1 time Flash, Timer lamp: 1 time Flash
Economy lamp: Continuous flash.
4. Outdoor unit fan motor failure
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).
AC
AC