Service manual

210-10 ADL 45/62 599 75 60-77
(4) Communication Malfunction
E6 is displayed on indoor unit
Green LED lamp of outdoor unit doesn’t blink.
# If there is no LED lamp blinking,
1. Measure voltage between N1 (neutral wire ) and 3 (live wire) on patching board of outdoor electric box by AC voltage grade of
universal meter. If it is found that there is voltage, check if there is electricity for patching board of indoor unit. If there is no
electricity, check if wiring of indoor unit is correct. Otherwise replace controller of indoor unit.
2. If power supply of indoor unit is normal, check if wiring of outdoor unit is correct and if there is any wrong or loose wiring.
3. If the above two conditions don’t exist, outdoor controller can be replaced directly.
# Any or a few of indicators are normally on,
Such circumstance usually indicates that IC on outdoor controller doesn’t work. Outdoor controller can be replaced directly.
# There is only red indicator blinking
1. Set universal meter to DC voltage grade to measure voltage of detection point 8. If voltage is between 0~3.3V, the signal has
been sent by indoor unit but not received by outdoor unit yet. In that case, replace outdoor controller directly.
2.If voltage of detection point 8 is always around 3.3V or around 0V, set universal meter to AC voltage to measure voltage
between communication wire （2） and neutral wire (N1) on patching board. If voltage swings between 0V and 20V, the signal
has been sent by indoor unit but not received by outdoor unit yet. In that case, replace outdoor controller directly. If voltage
doesn’t change, indoor unit has not sent signal or the communication wire is damaged. Check communication wire or replace
indoor controller.
(5) Freeze Protection
E2 is displayed on indoor unit
Yellow LED lamp of outdoor unit blinks for 3 times
# It indicates that the temperature of indoor evaporator is too low so it is easily frozen. Check if indoor fan is operating.
Communicati
on
malfunction
Three LED
lamps are all off
Any LED lamp or a few of
LED lamps are always
on.
Only red LED
lamp blinks
Chec k v o l t a g e s of
neutral and live wire
on patching board of
ODU.
Replace ODU
directly.
Check voltage of detection point
8 by DC voltage grade of
universal meter.
Normal
Abnormal
Check if
wiring or ODU
is correct.
Check if
wiring or IDU is
correct.
Wiring is
wrong or loose
and correct the
wiring.
Wiring is
correct and
replace the IDU.
Voltage is
between 0~ 3.3V
Voltage is always
at high level or
always at low
level.
Replace outdoor
controller directly.
Wiring is wrong or loose
and correct the wiring.
Wiring is correct
and replace the
outdoor controller.
Measure voltage
between communication
wire and neutral wire on
patching board with
universal meter.
V o lt a ge c ha n ge s
b e t w e e n 0 V a n d
20V.
Voltage doesn’t
change
Replace outdoor
controller directly.
Check communication
wire or replace indoor
controller.