Gree KW09HQ3D6D Series Service Manual page 47

Malfunction
NO.
Name
Decrease
frequency
19 due to
high air
discharge
Limit/
decrease
20 frequency
due to
antifreezing
Voltage for
21 DC bus-bar
is too high
Voltage of
22 DC bus-bar
is too low
Defrosting
23
Malfunction
24
of zero-cross
detection
circuit
Zero-
crossing
25
malfunction of
outdoor unit
44
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF
Dual-8
0.5s)
Code
Display
Operation Cool Heating
Indicator Indicator Indicator
F9
FH
PH
PL
OFF 3S
and blink
once
(during
blinking,
ON 10s
and OFF
0.5s)
U8
U9
A/C status
All loads operate normally,
while
operation frequency for
compressor is decreased
All loads operate normally,
while operation frequency for
compressor is decreased
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Defrosting will occur in
heating mode. Compressor will
operate while indoor fan will
stop operation.
The complete unit stops
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
Possible Causes
Overload or temperature is too
high;
Malfunction of electric expansion
valve (EKV)
Poor air-return in indoor unit or fan
speed is too low
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)
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)
Its the normal state
1.Power supply is abnormal;
2.Detection circuit of indoor
control mainboard is abnormal.
Replace outdoor control panel AP1
Installation and Maintenance
Service Manual