Fujitsu AB F18LAT Series Service Instruction page 34

2-1-3 INDOOR UNIT DISPLAY
1. ERROR DISPLAY
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 sensor error
Indoor heat exchanger temperature sensor error
Water drain abnormal
Outdoor discharge pipe temperature
sensor error
Outdoor heat exchanger temperature
sensor(outlet) error
Outdoor temperature sensor error
Compressor temperature sensor error
Outdoor heat exchanger temperature
sensor(middle) error
Indoor manual auto switch error
IPM error
CT error
Compressor rotor location cannot detect
(permanent stop)
Outdoor unit fan motor error
Outdoor unit computer communication error
Indoor fan motor abnormal
Discharge temperature error
Exessive high pressure protection on cooling
4-way valve error
Compressor temperature error
PFC circuit error
Indoor EEPROM abnormal (Model No.)
:
0.5s ON / 0.5s OFF (Flash)
Error display
OPERATION
(GREEN) (ORANGE)
2 times
3 times
4 times
5 times
6 times
7 times
8 times
2 times
2 times
2 times
3 times
6 times
2 times
2 times
3 times
3 times 3 times
3 times 4 times
3 times
8 times
3 times
4 times
2 times
5 times 2 times
5 times 3 times
5 times 5 times
5 times 6 times
5 times 8 times
2 times
6 times
3 times
7 times 2 times
7 times 3 times
7 times 4 times
7 times 6 times
4 times
8 times
Continuous Continuous
blink blink
:
OFF
+1
02-03
TIMER FILTER
(RED)
4 times
Continuous
blink
Trouble
shooting
2
12
22
23
1
3
4
6
8
5
7
13
24
19
14
15
16, 28
17
18
11
9
20
26, 27
25
21
10