Fujitsu ASU30RLE Service Instruction page 41

Trouble shooting 2
INDOOR UNIT Error Method:
Serial Communication Error
(Serial Forward Transfer Error)
Detective Actuators:
Indoor unit controller PCB
Forecast of Cause:
1. Connection 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 L - N.
OK
Test 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.
BLACK 1
2
WHITE
3
RED
L
BLACK
N
WHITE
Indicate of Display:
Indoor Unit :
Operation lamp: 1 times Flash,
Timer lamp
ERROR CODE : [E : 11]
Detective details:
When the indoor unit cannot properly receive the serial signal from indoor unit
for 10 seconds or more.
2. External cause 3. Controller PCB failure
+
-
Outdoor unit :
POWER
MODE
: 1 times Flash
NO
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).
02-05
PUMP LOW
DOWN NOISE
ERROR
(L1) (L2) (L3) (L4)
1 1
2
2 1 1
n : n times blinking
: Light OFF : Light ON
PEAK
CUT
(L5) (L6)