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

Page: 45 / 60

YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
45
Key:
★ : LIGHT
○ : FLASHING LIGHT
X : OFF Flash cycle is 1 second
Error Code
Running Timer Sleep Power
Issue
Cause may be one of the following:
1 2 3 4
0 Normal Operation
1 X
○
X X
Outdoor coil temperature
sensor failure

Outdoor temperature sensor
connection is loose

Outdoor temperature sensor failure

Indoor control board failure
2 X
○
★
X
Compressor exhaust
temperature sensor issue

Compressor exhaust temperature
sensor connection is loose

Compressor exhaust temperature
sensor failure

Outdoor control board failure
5
★
○
X X IPM module protection

IPM board failure

Outdoor unit fan is broken

Outdoor unit fan motor failure

Outdoor unit fan motor is blocked

Condenser is dirty

Outdoor unit not installed properly
6
★
○
X
★
AC voltage out of range
protection

Supplied voltage is higher or lower
than normal

Indoor unit supply voltage is higher
or lower than normal
7
★
○
★
X
Communication failure
between Indoor Unit and
Outdoor Unit

Communication cable connection is
loose

Communication cable failure

Connection between the filter board
and the outdoor control board is
incorrect or loose

Connection between the filter board
and the terminal is incorrect or loose

Indoor control board failure

PFC board failure

Power board failure

Outdoor control board failure
8
★
○
★ ★
Current overload
protection

Fan motor is running abnormally

Condenser and evaporator are dirty

Air inlet and/or outlet is abnormal
9 X X
○
X
Maximum current
protection

Outdoor control board has a short
circuit

Drive board has a short circuit

Other 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