Gree GWH12AGB-K6DNA1A/O

106
Installation and Maintenance
Service Manual
NO.
Malfunction
Name
Display
Method of
Indoor Unit
A/C status Possible Causes
Dual-8
Code
Display
17
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 insufcient;
Malfunction of electric expansion valve
(EKV)
18
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
19
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)
20
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)
21
Compressor
Min
frequence in
test state
P0
Showing during min. cooling or min. heating
test
22
Compressor
rated
frequence in
test state
P1
Showing during nominal cooling or nominal
heating test
23
Compressor
maximum
frequence in
test state
P2
Showing during max. cooling or max.
heating test