63
Service Manual
Installation and Maintenance
11
Outdoor
condenser
temperature
sensor is
open/short
circuited
F4
□
□
☆
□
During cooling and drying
operation, compressor stops while
indoor fan will operate; During
heating operation, the complete unit
will stop operation.
Outdoor temperature sensor hasnt been connected
well or is damaged. Please check it by referring to the
resistance table for temperature sensor)
12
Outdoor
discharge
temperature
sensor is
open/short
circuited
F5
□
□
☆
☆
During cooling and drying
operation, compressor will sop
after operating for about 3 mins,
while indoor fan will operate;
During heating operation, the
complete unit will stop after
operating for about 3 mins.
1. Outdoor temperature sensor hasnt been connected
well or is damaged. Please check it by
referring to the resistance table for temperature sensor)
2. The head of temperature sensor hasnt been inserted
into the copper tube
13
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)
14
Malfunction
of complete
units current
detection
U5
□
■
☆
■
During cooling and drying
operation, the compressor will
stop while indoor fan will operate;
During heating operating, the
complete unit will stop operation.
Theres circuit malfunction on outdoor units control panel
AP1, please replace the outdoor units control panel AP1.
15
Overcurrent
protection of
phase
current for
compressor
P5
□
☆
□
□
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss
of synchronism protection and overcurrent protection of
phase current for compressor.
16
Defrosting
Heating
indicator
off for 0.5s
and then
blinks for
10s
Defrosting will occur in heating
mode. Compressor will operate
while indoor fan will stop
operation.
Its the normal state
17
Overload
protection for
compressor
H3
□
☆
☆
□
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
1. Wiring terminal OVC-COMP is loosened. In normal
state, the resistance for this terminal should
be less than 1ohm.
2. Refer to the malfunction analysis ( discharge
protection, overload)
18
IPM
protection
H5
□
☆
□
■
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss
of synchronism protection and overcurrent protection of
phase current for compressor.
19
PFC
protection
HC
□
■
☆
☆
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
Refer to the malfunction analysis
20
Desynchron-
izing of
compressor
H7
□
☆
■
☆
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss
of synchronism protection and overcurrent protection of
phase current for compressor.
21
Failure start-
up
LC
□
☆
□
☆
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation.
Refer to the malfunction analysis
22
Malfunction
of phase
current
detection
circuit for
compressor
U1
□
☆
■
□
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
23
EEPROM
malfunction
EE
□
□
□
■
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
24
Charging
malfunction
of capacitor
PU
□
■
□
■
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Refer to the part three—charging malfunction analysis of
capacitor
