NO.
Malfunction
Name
Display Method of Indoor Unit
A/C status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
19
Decrease
frequency due
to
high air
discharge
F9
All loads operate normally, while
operation frequency for
compressor is decreased
Overload or temperature is too high;
Refrigerant is insufficient;
Malfunction of electric expansion
valve (EKV)
20
Limit/
decrease
frequency due
to
antifreezing
FH
All loads operate normally, while
operation frequency for compressor
is decreased
Poor air-return in indoor unit or fan
speed is too low
21
Voltage for
DC bus-bar is
too high
PH
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 265VAC, turn
on the unit after the supply voltage
is increased 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)
22
Voltage of DC
bus-bar is too
low
PL
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
1. Measure the voltage of position
L and N on wiring board (XT), if the
voltage is higher than 150VAC,
turn on the unit after the supply
voltage is increased 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)
23
Compressor
Min frequence
in test state
P0
Showing during min. cooling or min.
heating test
24
Compressor
rated
frequence in
test state
P1
Showing during nominal cooling or
nominal heating test
25
Compressor
maximum
frequence in
test state
P2
Showing during max. cooling or
max. heating test
39
