Gree GWH18TC-S3DNA1D Service Manual page 67

Malfunction
of module
25
temperature
sensor circuit
Module high
26 temperature
protection
Malfunction
of voltage
27
dropping for
DC bus-bar
Voltage of
28 DC bus-bar
is too low
Limit/
decrease
frequency
29
due to high
temperature
of module
The four-way
30 valve is
abnormal
Fan module
31
protection
Malfunction
32 of detecting
plate(WIFI )
64
P7 □ □ ■
☆
P8 ■ □ ■
☆
U3 □ ■ ■ ■
PL □ ■ ■ □
EU ■ ■ ■
☆
U7 ■ □ □
☆
L3 ■ □ □ □
JF
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling operation,
compressor will stop while indoor
fan will operate; During heating
operation, the complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
All loads operate normally, while
operation frequency for
compressor is decreased
If this malfunction occurs during
heating operation, the complete
unit will stop operation.
Cooling:outdoor fan
motor,compressor stop
running;indoor fan works.
Heating:outdoor fan
motor,compressor,indoor fan motor
stop running.
Replace outdoor control panel AP1
After the complete unit is de-energized for 20mins,
check whether the thermal grease on IPM Module of
outdoor control panel AP1 is sufficient and whether the
radiator is inserted tightly. If its no use, please replace
control panel AP1.
Supply voltage is unstable
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)
Discharging after the complete unit is de-energized for
20mins, check whether the thermal grease on
IPM Module of outdoor control panel AP1 is sufficient
and whether the radiator is inserted tightly.
If its no use, please replace control panel AP1.
1. Supply voltage is lower than AC175V;
2. Wiring terminal 4V is loosened or broken;
3. 4V is damaged, please replace 4V.
1. The wire terminal of outdoor fan motor is loosed,fix
the terminal.
2. Motor damaged,replace the motor.
3. Fan motor module on mainboard is damaged;replace
the mainboard AP1.
Refer to the malfunction analysis
Installation and Maintenance
Service Manual