Fujitsu AUXB04GALH Service Manual page 97

Trouble shooting 19
INDOOR UNIT Error Method:
Indoor Unit Power Supply Error
of AC24V System
Detective Actuators:
Indoor Unit Power Supply PCB Circuit
Indoor Unit Power Trans
Indoor Unit Controller PCB
Forecast of Cause : . 1
4. Power Supply PCB
Check Point 1 : Check the Power Supply PCB and Controller PCB
Check the connection of connection terminal between Power Supply PCB(CN24) and
Controller PCB(CN114) and check if there is a disconnection or short of the cable.
OK
Check Point 2 : Check the connection of terminal
After turning off the power, check & correct of followings.
>>Check the connection of terminal between Power Trans and Power Supply PCB(CN113),
and Check if there is a disconnection or short of the cable.
OK
Check Point 3 : Check the Power Trans and Power Supply PCB
Check terminal voltage of Power Trans and Power Supply PCB connector CN113 (AC24V IN).
If AC 0V, Power Trans is failure >>Replace Power Trans
If AC24V, To the Check Point 4.
OK
Check Point 4 : Replace the Power Supply PCB
Replace Power Supply PCB.
OK
Check Point 5 : Replace the Controller PCB
Replace Controller PCB and set up the original address.
E39. 3
Indicate or Display:
Outdoor Unit : E.5 U.1
Error Code
Detective details:
When the AC voltage of the Power Trans output , Is lower than 24V.
T r e m n i l a C o n n e t c o i n A b n r o
5. Controller PCB
: 3 9
m l a . 2 P o w r e S u p p y l A b
6. Cable Connection failure
04-27
n r o m l a 3. Power Trans
AC