64
Service Manual
Installation and Maintenance
25
Malfunction
of module
temperature
sensor circuit
P7
□
□
■
☆
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Replace outdoor control panel AP1
26
Module high
temperature
protection
P8
■
□
☆
■
During cooling operation,
compressor will stop while indoor
fan will operate; During heating
operation, the complete unit will stop
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.
27
Malfunction
of voltage
dropping for
DC bus-bar
U3
□
■
■
■
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Supply voltage is unstable
28
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)
29
Limit/
decrease
frequency
due to high
temperature
of module
EU
■
■
■
☆
All loads operate normally, while
operation frequency for
compressor is decreased
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.
30
The four-way
valve is
abnormal
U7
■
□
☆
□
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.
31
Fan module
protection
L3
■
□
□
□
Cooling:outdoor fan
motor,compressor stop
running;indoor fan works.
Heating:outdoor fan
motor,compressor,indoor fan motor
stop running.
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.
32
Malfunction
of detecting
plate(WIFI )
JF
Refer to the malfunction analysis
