YMGI WMMS-12EC-V2B, Installer'S Instruction & User'S Manual, Page: 17 / 23

UNIT MAINTENANCE & SER
VICE GUIDE
UNIT MAINTENANCE & SER
VICE GUIDE
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TROUBLE SHOOTING
When the unit is controlled by wire controller, error or protection codes are as follows:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Compressor high pressure protection unit stop
Indoor unit anti-freezing protection
Low-pressure protection unit stop
Air exhaust protection unit stop
Over current protection unit stop
Communication malfunction unit stop
Unit modes conflict
Jumper malfunction
Defrosting /Heating oil return
Compressor overload protection unit stop
System Unit malfunction
IPM modular protection unit stop
PFC protection unit stop
Compressor malfunction
Water spill protection
Indoor ambient temp. sensor malfunction
Indoor pipe temp. sensor malfunction
Outdoor ambient temp. sensor malfunction
Outdoor pipe temp. sensor malfunction
Outdoor air exhaust temp. sensor malfunction
E2 PROM Error
Wire control ambient temp. sensor malfunction
E1
E2
E3
E4
E5
E6
E3
E3
Defrost
E5
F2
E5
E5
E9
E9
F0
F1
F3
F2
F4
E3
F5
Code indication
on display
Meaning
NO.
TROUBLE SHOOTING
ERROR OR PROTECTION CODE INDICATION
NO.
Error or protection codes
LED (red) LED (yellow) LED (green)
1
Compressor high pressure protection unit stop
Blink once
2
Indoor unit anti-freezing protection
Twice times
3
Low-pressure protection unit stop
Three times
4
Air exhaust protection unit stop Four times
5 Over current protection unit stop Five times
6 Communication malfunction unit stop Six times
7 Unit modes conflict Seven times
8 Jumper malfunction Fifteen times
9 Defrosting/Heating oil return Blink once
10 Compressor overload protection unit stop Three times
11 System Unit malfunction
12 IPM modular protection unit stop
13 PFC protection unit stop
14 Compressor malfunction
15 Water spill protection
16 Indoor ambient temp. sensor malfunction
17 Indoor pipe temp. sensor malfunction
18 Outdoor ambient temp. sensor malfunction
19 Outdoor pipe temp. sensor malfunction
20 Outdoor air exhaust temp. sensor malfunction
21 E2 PROM Error Eleven times
22 Wire control ambient temp. sensor malfunction Blink once
Four times
Five times
Six times
Seven times
Eight times
Blink once
Twice times
Three times
Four times
Five times
LED Indication