Fujitsu S24LDC Service Instruction page 48

Indoor unit 0.5 0.5 sec
sec.
Controller 2 times
4 times
Error
0.5 sec No Display
3 times
0.5 sec
No Display
4 times
0.5 sec
7 times
0.5 sec
8 times
Forced Auto Switch Forced Auto Switch becomes ON for 10 consecutive seconds.
Error
> It indicates the error but the operation continues.
20
[Diagnosis Point]
- Check if forced Auto Switch is kept pressed.
- Forced Auto Switch defective.
- Controller PCB defective.
Main Relay Error
After 2 minutes 20 seconds of stopping operation, the signal from outdoor unit is received even though the main
relay is OFF.
> Main Relay OFF continues (Outdoor Unit OFF Command)
[Diagnosis Point]
- Main Relay defective
- Controller PCB defective.
The power supply frequency can not be recognized after 4 seconds of power ON.
Power Supply Frequency
> Permanent stop.
Detection Error
[Diagnosis Point]
VDD permanence stop When the air cleanness monitor trial protection operates 4 times.
protection
> Only clean air permanent stop.
(Electric air clean)
22
[Diagnosis Point]
- The front panel is closed.
- The foreign body such as dust doesn't adhere.
Reverde-VDD The air clean operation signal was detected for 1 minute at time of air clean mode OFF.
permanence stop > All stop. Not operate remote controller.
protection
21
(Electric air clean power [Diagnosis Point]
supply circuit abnormal) - Electric air clean defective.
- Controller PCB defective.
- Controller PCB defective.