Trouble Shooting With Error Code; Serial Communication Error 1 - Fujitsu ASU18RLF Service Instructions Manual

2-2 TROUBLE SHOOTING 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
5. Transistor PCB (IPM) failure
Test 1-1 : Reset the power and operate
Does error indication reappear?
YES
Test 2 : Check connection
Check any loose or removed connection line of
between indoor unit and outdoor unit.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check connection condition in control unit.
(If there is loose connector, open cable or miss-wiring)
OK
Test 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC187V(AC208V-10%) - 253V(AC230V+10%) appears
at outdoor unit terminal L1 - L2.
OK
Test 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 the parts as follows.
- Outdoor unit fan motor
- Active filter module
- Filter PCB
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
(SERVICE PARTS INFORMATION 10)
>> If Active filter module or IPM is abnormal, replace it.
>> If the parts are normal, replace Main PCB. (SERVICE PARTS INFORMATION 10)
BLACK 1
2
WHITE
RED 3
Indicate of Display:
Indoor Unit
Operation lamp : 1 time Flash
Timer lamp
ERROR CODE : [E : 11]
Detective details:
When the indoor unit cannot receive the serial signal from outdoor unit
more than 2 minutes after power ON, or the indoor unit cannnot receive
the serial signal more than 15 seconds during normal operation.
2. External cause 3. Main PCB failure
6. Filter PCB failure
NO
(SERVICE PARTS INFORMATION 6)
(SERVICE PARTS INFORMATION 8)
(Check the wire of CN201)
+
-
02-05
Outdoor Unit
A
1 1
: 1 time Flash
1 1
: Light ON
4. Active filter module failure
7. Outdoor unit Fan motor failure
Test 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).
Monitor
B C D E F
1
1
: Light OFF n : n time blinking