77
#
Malfunction
Name
Indoor Unit Display
Method
Outdoor Unit
Display Method
(repeated every 5
seconds)
o = O
n = Illuminated
« = Blink
A/C Status Possible Causes
Indoor
Display
Heating
Indicator
34 Malfunction of
voltage drop-
ping for DC
bus-bar
U3 O 3s and
blink 20 times
o n n n
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Supply voltage is unstable
35 Voltage of DC
bus-bar is too
low
PL O 3s and
blink 21 times
o n n o
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
1. Measure the voltage of
position L and N on wiring
board (XT), if the voltage is
higher than 150VAC, turn
on the unit a er the supply
voltage is increase to the
normal range; 2. If the AC
input is normal, measure
the voltage of electrolytic
capacitor C on control
panel (AP1), if its normal,
theres malfunction for the
circuit, please replace the
control panel (AP1)
36 Limit/decrease
frequency due
to high tempera-
ture of module
EU
n n n «
All loads operate normally,
while operation frequency
for compressor is decreased.
Discharging a er the
complete unit is de-ener-
gized for 20 mins check on
whether the thermal grease
on IPM Module of out-
door control panel AP1 is
su cient and whether the
radiator is inserted tightly.
If its no use, please replace
control panel AP1.
37 e four-way
valve is abnor-
mal
U7
n o « o
If this malfunction occurs
during heating operation,
the complete unit will stop
operation.
1. Supply voltage is lower
than AC175V; 2. Wiring
terminal 4V is loosened or
broken; 3. 4V is damaged,
please replace 4V
38 Zero-crossing
malfunction of
outdoor unit
U9
n n « o
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Replace outdoor control
panel AP1
39 Limit/decrease
frequency due
to freezing
FH
n n n o
All loads operate normally,
while operation frequency
for compressor is decreased.
Poor air-return in indoor
unit or fan speed is too low
Troubleshooting 18,000/24,000 btuh Units, cont.
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