Error Display; Indoor Unit Display - Fujitsu ASU18RMLQ Service Instruction

2. TROUBLESHOOTING

2-1 ERROR DISPLAY

2-1-1 INDOOR UNIT DISPLAY

For ASU9 - 18RMLQ
The OPERATION, TIMER, AIR CLEAN and COIL DRY lamps operate
as follows according to the error contents.
Error contents
Communication error
(Serial reverse transfer error)
Outdoor communication signal error
(Forward transfer signal error)
Communication error
(indoor unit remote control)
Room temperature thermistor error
Indoor heat exchanger temperature
thermistor (middle) error
Outdoor discharge pipe temperature
thermistor error
Outdoor heat exchanger temperature
thermistor error
Outdoor temperature thermistor error
Heat sink temperature thermistor error
Compressor temperature thermistor error
2-way valve temperature thermistor
3-way valve temperature thermistor
Manual auto switch error
Power supply frequency detection error
VDD permanence stop protection
(Electric air clean)
Reverse-VDD permanence stop protection
(Electric air clean power supply circuit abnormal)
IPM error
CT error
Compressor rotor location cannot detect
(permanent stop)
Outdoor unit fan motor error
Connected indoor unit error
Main CPU-Sub CPU communication error
Indoor fan motor abnormal
Discharge temperature error
Exessive high pressure protection on cooling
Pressure switch error
Active filter module (AFM) error
Indoor EEPROM abnormal (Model No.)
:
0.5s ON / 0.5s OFF (Flash)
OPERATION
(RED) (GREEN)
2 times
3 times
4 times
5 times
8 times
2 times
2 times
3 times
2 times
2 times
3 times
3 times
3 times
3 times 4 times
3 times 7 times
3 times 8 times
error
3 times
error
3 times
2 times
4 times
4 times 4 times
7 times
4 times
8 times
4 times
2 times
5 times
5 times 3 times
5 times
5 times
6 times
5 times
7 times
5 times
5 times 8 times
2 times
6 times
3 times
2 times
7 times
3 times
7 times
7 times 5 times
2 times
8 times
3 times
Continuous Continuous
blink
:
OFF
02-01
Error display
AIR CLEAN
COIL DRY
TIMER
or QUIET
(GREEN) (ORANGE)
2 times
3 times
Continuous Continuous
blink blink blink
Trouble
shooting
2
11
1
3
4
8
5
7
19
12
21
22
25
26
29
30
14
15
17
18
23
24
10
31
32
13
16
9