YMGI WMMS-09C-V2B(78)1, Installer'S Instruction & User'S Manual

Page: 48 / 60

YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
48
LED Display
Key:
★ : LIGHT
○ : FLASHING LIGHT
X : OFF Flash cycle is 1 second
Error Code
Sleep Timer Running
Issue
Cause may be one of the following:
1 2 3
0 Normal Operation
1
○
★ ★
Outdoor coil temperature
sensor failure

Outdoor temperature sensor loose

Outdoor temperature sensor failure

Indoor control board failure
2
Compressor exhaust
temperature sensor issue

Compressor exhaust temperature sensor is
loose

Compressor exhaust temperature sensor
failure

Outdoor control board failure
5
★
○
X IPM module protection

IPM board failure

Outdoor fan is broken

Outdoor fan motor failure

Outdoor fan is blocked

Dirty condenser

Outdoor unit has been installed incorrectly
6 X
○
X
AC voltage high or low
protection

Supplied voltage is higher or lower than
normal

Internal supplied voltage of the unit is higher
or lower than normal
7
★ ★
X
Communication failure
between Indoor unit and
Outdoor unit

Communication cable is loose

Communication cable failure

Connection between filter board and outdoor
control board is incorrect or loose

Connection between the filter board and
terminal is incorrect or loose

PFC board failure

Power board failure

Outdoor control board failure
8
Current overload
protection

Fan motor is running abnormally

Dirty condenser and evaporator

Air inlet and/or outlet is abnormal
9
Maximum current
protection

Outdoor control board has a short circuit

Drive board has short circuit

Another component has a short circuit
10
★
X X
Communication issue
between Outdoor unit and
driver

Connection wires connection loose

Outdoor board or drive board failure
11
○
X X Outdoor EEPROM issue

EEPROM chip is loose

EEPROM chip is installed backwards

EEPROM chip failure