Fujitsu ASU9RLQ Service Instructions Manual page 50

Self - diagnosis function and Checking points
Error Indication
Wired remote
Operation Timer controller
(RED) (GREEN)
0.5 sec 0.5 sec
6 times 2 times
No Display
0.5 sec
3 times
No Display
0.5 sec 0.5 sec
7 times 2 times
0F
0.5 sec
3 times
24
0.5 sec 0.5 sec
8 times 4 times
25
Error
(Protection)
Indoor fan lock error
The indoor fan speed is 0 rpm after 56 seconds from starting operation or from the time the fan mode was changed.
> Operation stop. (It releases by sending the operation stop signal from the remote controller).
[Diagnosis Point]
Fan motor connector loose /defective contact.
Fan motor defective
Controller PCB defective.
Indoor fan speed error
The indoor fan speed is 1/3 of the target frequency after 56 seconds from starting operation or from the time the fan mode was
changed. > Operation stop. (It releases by sending the operation stop signal from the remote controller).
[Diagnosis Point]
Fan motor connector loose /defective contact.
Fan motor defective
Controller PCB defective.
Discharge temperature
The discharge temperature error is activated.
> Permanent stop.
error
[Diagnosis Point]
Check if 2-way valve or 3-way valve is left open.
Heat radiation is blocked (Inlet /outlet).
Check if outdoor fan is defective (does not rotate).
Refrigeration cycle defective (Refer to after mentioned "refrigerant cycle disagnosis").
Excessive high pressure
Excessive high pressure protection on cooling mode has been activated.
protection on cooling > Compressor, outdoor fan : Off (It releases after 3 minute ST).
[Diagnosis Point]
Heat radiation is blocked (Inlet /outlet).
Check if outdoor fan is defective (does not rotate).
Refrigeration cycle defective (Refer to after mentioned "refrigerant cycle disagnosis").
PFC circuit error Excessive voltage of DC voltage on PFC circuit in inverter PCB is detected, or the excessive current in the circuit is detected.
> Permanent stop.
[Diagnosis Point]
Controller PCB defective (Refer to after mentioned "PFC circuit diagnosis")
Diagnosis Method