Fujitsu ASU18RMLQ Service Instruction page 28

For AUU9 - 18RML
The OPERATION, TIMER and FILTER 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
(Main PCB Display PCB)
Communication error
(Main PCB Display PCB)
Communication error
(indoor unit remote control)
Room temperature thermistor error
Indoor heat exchanger temperature
thermistor (middle) error
Water drain abnormal
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
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
4 way valve error operation
Pressure switch error
Compressor temperature error
Indoor EEPROM abnormal error
:
0.5s ON / 0.5s OFF (Flash)
OPERATION
(GREEN)
2 times
2 times
2 times
3 times
3 times
3 times
3 times
3 times
3 times
error
error
3 times
4 times
5 times
5 times
5 times
5 times
5 times
5 times
6 times
7 times
7 times
7 times
7 times
7 times
continuance
blink
:
OFF
02-02
Error display
TIMER FILTER
(ORANGE) (RED)
2 times
3 times
4 times
5 times
6 times
7 times
8 times
2 times
3 times
6 times
2 times
3 times
4 times
7 times
8 times
2 times
3 times
2 times
2 times
3 times
5 times
6 times
7 times
8 times
2 times
3 times
2 times
3 times
4 times
5 times
6 times
continuance continuance
blink blink
Trouble
shooting
2
11
27
28
1
3
4
6
8
5
7
19
12
21
22
25
14
15
17
18
23
24
10
31
32
35
13
33
9