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YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
46
TROUBLESHOOTING
When there's malfunction or protection, the display screen of indoor unit or LED will display corresponding code and LED
on main board of outdoor unit will also display warnings. Please refer to the function parts as before for details. When
protection or malfunction has been eliminated, the display will resume normal status.
Analysis or disposal for some display malfunction
Indicator
Dual 8
nixie tube
Wire
controller
Causes and
troubleshooting
No
Malfunction name
Red light
(running
LED)
Yellow light
(heating
LED)
Green light
(cooling
LED)
Dual 8 for
floor
ceiling unit
Wire controller
display method
for duct type
unit
1
Malfunction of
jumper cap
Blink 15
times
C5
E3
The jumper cap is missed
or bad on main board of
indoor unit. Please check
or replace the correct
jumper or the main board
of indoor unit.
2
Water overflow
protection
Blink 8
times
H8
H8
There's a connection
malfunction at WATER-D
on main board, or the
water overflow switch is
bad. Please check or
replace it.
3
Indoor ambient
temperature sensor
is open circuit or
short circuit
Blink once
F1
F0
The temperature sensor at
ROOM on indoor main
board has malfunction,
please check or replace it.
4
Indoor evaporator
temperature sensor
is open circuit or
short circuit
Blink twice
F2
F1
The temperature sensor at
TUBE or TUBE-I or TUBE-
O on indoor main board
has malfunction. Please
check or replace it.
5
Malfunction of
ambient temperature
sensor on wired
controller
Display the malfunction of indoor ambient temperature
sensor when using this temperature sensor.
(Green light: blink once)
F5
Replace the wire
controller.
Notes:
For ceiling cassette indoor units, floor standing type indoor unit, the wired wall mount controller is optional. If the
unit hasn't been installed with the wired controller, the error codes listed above will not be displayed.
Ceiling Cassette indoor unit only has 3 indicators, no dual 8 display on the unit.
Only the ceiling cassette indoor unit has the water overflow error protection. Floor ceiling type and duct type indoor
fans are not built with this error protection.
