Fujitsu AOYG45LAT8 User Manual page 64

2-4 TROUBLE SHOOTING
Trouble shooting 1
ALL UNIT Error Method:
Serial Communication Error
(Serial Forward / Reverse Transfer Error)
Detective Actuators:
door Unit
Out
Indoor Unit
Branch Box
(Primary / secondary)
Forecast of Cause:
1. Connection failure
4. Controller PCB(Indoor unit / Branch Box) failure
Check Point 1-1 : Reset the power and operate
Does error indication reappear?
YES YES
Check Point 2 : Check connection
Check for loose or removed connection line of error.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Design&
Technical Manual.
Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)
OK
Check Point 3 : Check the error unit of indoor unit
Check the which case?
Case 1. When only one indoor unit error
Case 2. When more than one indoor unit error
Case 3. When all indoor unit error
Case 1. When only one indoor unit error
Check the error display of indoor unit
Replace Controller PCB of indoor unit of error.
NG
Check the error display of each Branch Box(Primary / secondary)
Replace Controller PCB of Branch Box (Primary or Secondary) of error
and execute the check operation again.
Indicate or Display:
Outdoor Unit :
Indoor Unit
Error Code
Detective details:
When the branch box cannot properly receive the serial signal from
Outdoor unit / Indoor unit / Branch Box.
When the Outdoor unit / Indoor unit cannot properly receive the
serial signal from Branch Box.
- When power is turn-on : 2 minutes.
- In operation : 15 seconds.
2. External cause 3. Main PCB(Outdoor unit) failure
: Refer to Connection line and Serial signal error list
(Page 13 )
:
NO
Check Point 1-2 : Check external cause such as noise
Check if the ground connection.
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).
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