Fujitsu ASU9RLQ Service Instructions Manual page 49

Self - diagnosis function and Checking points
Error Indication
Wired remote
Operation Timer controller
(RED) (GREEN)
0.5 sec 0.5 sec
4 times 7 times
No Display
0.5 sec
8 times
21
0.5 sec 0.5 sec
5 times 2 times
17
0.5 sec
3 times
18
0.5 sec
5 times
1A
0.5 sec
6 times
1B
Error
(Protection)
VDD permanence stop
When the air cleanness monitor trial protection operates 4 times.
protection > Only clean air permanent stop.
(Electric air clean)
[Diagnosis Point]
The front panel is closed.
The foreign body such as dust doesn't adhere.
Reverde-VDD permanence
The air clean operation signal was detected for 1 minute at the time of air clean mode OFF.
stop protection > All stop. Not operate remote controller.
(Electric air clean power
[Diagnosis Point]
supply circuit abnormal)
Electric air clean defective.
Controller PCB defective.
IPM protection
Abnormal current value of IPM is detected.
> Permanent stop.
[Diagnosis Point]
Heat radiation is blocked (inlet/outlet).
Check if outdoor fan is defetcive (does not rotate).
Controller PCB defective (Refer to after mentioned "IPM diagnosis").
Refrigeration cycle defective (Refer to after mentioned "refrigeration cycle diagnosis").
CT error
The current value during the operation after 1 minute from starting up the compressor is 0A.
> permanent stop.
[Diagnosis Point]
Check if CT wire is open.
Controller PCB defective.
Compressor location error The compressor speed does not synchronze with the control signal. (Including start up failure of the compressor).
> permanent stop.
[Diagnosis Point]
Check if 2-way valve or 3-way valve is left open.
Check the compressor (Winding resistance value, loose lead wire).
Refrigeration cycle defective (Refer to after mentioned "refrigerant cycle diagnosis")
Outdoor fan error Either the outdoor fan motor abnormal current or location error was detected.
> Permanent stop.
(DC motor)
[Diagnosis Point]
Fan motor connector loose/ defective contact.
Fan motor defective.
Controller PCB defective.
Diagnosis Method