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

Page: 44 / 60

YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
44
When the compressor is in operation
Key:
★ : LIGHT
○ : FLASHING LIGHT
X : OFF Flash cycle is 1 second
No. LED 1 LED 2 LED 3
Reason current operating frequency of the
compressor is limited
Lights will flash every second for the following faults
1
○ ○ ○
Normal frequency increasing and decreasing. No limitation
2 x x
★
Frequency decreasing or prohibition of frequency increasing caused by
over current
3 x
★ ★
Frequency decreasing or prohibition of frequency increasing caused by
anti-freezing of refrigeration or anti-overload in heating
4
★
x
★
Frequency decreasing or prohibition of frequency increasing caused by
compressor discharge temperature is too high
5 Limit to maximum operating frequency caused by low voltage
6
★ ★ ★
Operation at fixed frequency (in case of capability measuring or
compulsory operation at fixed frequency)
7
○
x x
Protective frequency decreasing against outdoor overload (over power,
over frequency conversion rate, over torque, and detection of DC under-
voltage)
8
★
x x
Frequency decreasing caused by indoor and outdoor communication
fault
9 x
★
○
Frequency decreasing or prohibition of frequency rising protection
against overload of outdoor coiled pipe
10 x
★
x
Frequency decreasing or prohibition of frequency increasing for power-
saving when it is being used simultaneously with other applications
Indication on the Indoor Unit
The 88 display of the indoor display board will show the error code automatically when the unit has the following issue
Error Code Error
Reason current operating frequency of the
compressor is limited
EA
Error code indicates an
issue with communication
between the display board
and control board

Connection between display board and control board is loose

Indoor control board failure

Wiring to the display board is incorrect
If the unit has the following issue, and the compressor stops running, press the sleep button on the remote controller 10
times in 10 seconds, and the Indoor unit 88 display on the display board will show the error code. If two malfunctions
happen at the same time, pressing the sleep button an additional 10 times in 10 seconds will display the second error
code.
Note:
When you perform a troubleshooting inquiry using the Indoor unit 88 display, the error code will be displayed after
entering the command with the remote control. If
the error code can’t be displayed on the indoor unit, you will need to
check the LED display board on the outdoor unit.