9. Troubleshooting

9. Troubleshooting
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The breaker trips at once when it
is set to “ON”.
Air conditioner can not
start up
Trip of breaker or
blow of fuse
The air conditioner does not
react after it is
powered ( after
the plug is
inserted, the
buzzer does not
sound and the
remote startup
has no
response)
to ground to see if there is any
leakage.
The breaker trips in few minutes
when it is set to “ON”.
The circuit or the part of the air
conditioner has malfunction.
They heat and break the insulation and lead to short circuit or
creepage. Measure the insulation resistance or eliminate the
malfunction one by one. If the
breaker itself has malfunction,
then replace the breaker.
No power
Check power supply circuit.
Power plug is not well plugged in
and poor connection.
Check if the plug is properly
plugged in and make the loose
contact firm.
Fuse of controller burnt out
Change controller fuse
The transformer connection is
loose or has bad contact or the
transformer has malfunction.
Fasten the wiring; measure the
output voltage of the transformer , if it is incorrect, change
the transformer.
Controller is broken
Check remote controller
Remote controller is short of power
The remote
controller does
not receive
signals (after it
is powered, the
buzzer will
sound, unless it
has
malfunction)
Measure insulation resistance
Remote controller malfunction
Receiver loose or poor connection
Receiver is broken
Power voltage is too low
Change batteries
First, press the manual switch
button AUTO,if there is no
response,check based on the
above methods. If it runs normally after pressing the button,
check again whether the installation position and the connection wire of the reception head
is correct. If it is correct,then replace the receiver or the remote
controller.
Check the voltage. If it is lower than 10% of
the rated voltage, check the cause, improve
the power supply condition and add the stabilized voltage power supply.
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Improper set of temperature
Adjust set temperature
If cooling (heating) load is
Check the forecasted load of cooling (heating)
proper
The refrigerant has leakage or is
insufficient
Check and fill the leakage, then
vacuumize it and supplement the refrigerant as required
Leakage between the high presMalfunction of
refrigerant
flow
sure and the low pressure in-
Replace the compressor
side the compressor
Malfunction of four-way valve
Local block of capillary
Replace the four-way valve
Replace the capillary
Poor COOL(HEAT) operation
Judge whether the system is blocked by
Blockage of cooling system
pressure manometer and take measures
to deal with the system.
Heat insulation for the connection
pipes of the indoor unit and the outdoor unit is bad.
Make sure that heat insulation for the thick and thin pipes
is good. Heat insulation must also be provided for the
joint andthe exposed part of the copper pipe .
Block of outdoor heat exchanger
Clean the dust accumulated on the surface
of the heat exchanger.
Air filter were blocked
Clean the filter
Fan speed was set too slow
Air circulation
is insufficient
Fan rotation speed becomes
low
The outdoor temperature is too high.
The air tightness is not enough. People
come in and out too frequently. There
are heating devices indoors.
To set the fan speed to high or
middle speed
Capacitor
damage
Motor damage
The installation position of the
outdoor unit is not appropriate.
observing the condensation of evaporator and the pressure value of the high
Replace the capacitor
Replace the motor
Good ventilation must be provided for the
installation position of the outdoor unit.
Properly install the rainproof plate or the sunproof plate. If the
maximum cool air still can not meet the requirement, it is suggested to replace the air conditioner.
Keep certain air tightness indoors, try not to use
electricalappliance with large quantity of heat
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The indoor fan motor is burned or
breaks or has the heat protector
malfunction.
Replace the fan motor or the defective part.
The fan does not
The built-in heat protector of the
motor breaks frequently because the
Replace the fan motor
run when it is set
to supply air.
motor is abnormal.
Wrong connection
The fan capacitor has open circuit or
is damaged.
Make the correction connection based on
the circuit drawing.
Replace the fan capacitor of the same type
and same specification.
In the cooling and
The outdoor fan motor is damaged.
Replace the fan motor
heating mode,
the compressor
Wrong connection
Make the correct connection based on the
circuit drawing
The outdoor fan capacitor is damaged.
Replace the fan capacitor
runs, but the outdoor fan does not
run.
Malfunction of compressor
Replace the compressor
Breakage of running capacitor of
In the cooling
and heating
mode, the
outdoor fan
runs, but the
compressor
does not run.
compressor
The voltage is too low or too
high.
Wrong wire connection
The protector itself has malfunction.
The refrigerant is not enough or is too
much.
The compressor is too hot
and leads to the
action of the
protector.
Replace the capacitor
Manostat is recommended.
Connect the circuit diagram correctly
Use the multimeter to check whether the
contact of the compressor is on when it is
not overheated. If it is not on, then replace
the protector
Adjust the volume of the refrigerant
The capillary is blocked and the temperature rises.
Replace the capillary
The compressor does not run
Replace the compressor
smoothly or is stuck. The air discharge
valve is damaged
The protector itself has malfunction.
Replace the protector
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The torque of the swing motor is not
enough
The swing fan
does not run.
Wrong connection
First, check whether the connection is
wrong. If no, replace the parts
The controller is damaged(IC2003 is
damaged, the swing relay can not
close, etc)
Controller malfunction (IC2003
broken, creepage of parallel capaci-
Change controller
In cool, heat
mode, the
tor of relay loop, relay is broken etc.)
outdoor unit
and compres-
Wire loose or wrong connection
Correctly wire according to the drawing
Improper setting of temperature
Adjust setting temp.
Drainage pipe blocked or broken
Change drainage pipe
Wrap of refrigerant pipe joint is not
Re-wrap and make it tight.
sor will not run.
Water leakage
close enough.
Fan of indoor unit contacts other parts
Foreign object in indoor unit
Compressor shakes too much
Adjust fan location
Take out the foreign object
Adjust support washer of compressor, and
tighten loosen screws
Abnormal sound
and shake
Touch of pipeline of outdoor unit
Separate the touching pipeline.
Touch of inner plates
1. Tighten connect screw.
2. Stick absorbing clay between plates.
Louver of outdoor unit touched outer
case.
Adjust location of louver.
Abnormal sound inside compressor
Change compressor
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Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor
Voltage higher than 200V?
Y
Fault with the voltage
testing circuit on
control panel AP1
Replace the control
panel AP1
N
Measure the AC voltage between
terminalL and N on wiring board
XT(power supply)
Voltage within
210VAC~250VAC?
N
Shut down the power
and repair the power
supply to restore the
range
210VAC~250VAC
power on and
restart the unit
If the fault is
eliminated?
Y
Y
Shut down the power and wait 20 minutes;
or use DC voltmeter to measure the voltage
on the two ends of capacitor , until the
voltage is lower than 20V
N
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
reactor Lis normal?
N
Connect the reactor
Laccording to Electrical Wiring Diagram correctly
Re-energize and
turn on the unit
Y
Replace the control
panel AP1
End
N
If the fault is
eliminated?
Y
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Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
Y
Use AC voltmeter
to measure the
voltage between
terminal L and N
on the wiring
board XT)
If the voltage
between terminal L
and N on wiring
board XT is within
210VAC~250VAC?
N
Check the supply
voltage and
restore it to
210VAC~250VAC
Y
Restart the unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
between the two
ends of electrolytic
capacitor on control
panel AP1
Voltage between
the two ends of celectrolytic
capacitor is
higher than
250V
Y
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
dirty? If they are
obstructed by other
objects which affect
the heat exchange
of indoor and
outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
The connection
of capacitor C2
is loose.
Reconnect the
capacitor C2 according
to Electrical Wiring
Diagram. Then,
Restart the
unit.
Y
N
Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage
between the two ends of
capacitor C2, until the
voltage is lower than 20V
Remove the wires
on the two ends of
capacitor C2. Then,
use capacitance
meter to measure
the capacitor C2.
Verify as per the
Parameters Sheet.
If capacitor
C2 is failed?
Replace the capacitor
C2. Then, energize
and start the unit.
Y
Replace the
control panel AP1
N
If there is any
abnormality
described above?
Y
Y
Take corrective actions
according to Technical
Service Manual, and
then energize and start
the unit.
Connect the control panel
AP1 and compressor
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
If the
resistance is
normal?
N
N
If the unit can
work normallv?
If the unit can
work normally?
Y
Y
N
Replace the
control panel AP1
N
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Y
N
Stop the unit and
disconnect the power
supply. Then, check
the connection of
capacitor C2
according to Electrical
Wiring Diagram.
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
If the unit can
work
normally?
N
If the unit can
work
normally?
If the unit can
work normally?
Y
N
Y
Replace the
compressor
COMP
N
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
Resistance higher
than 500MΩ?
Y
Replace the
control panel
AP1
END
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Overheat and high
temperature protection
Is outdoor ambient temperature higher than 53?
Y
Normal protection, please operate
it after the outdoor ambient temperature is normalized.
N
20 minutes after the complete
unit is powered off.
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
Y
Improve the heat
dissipation environment of the unit
N
Does the outdoor fan work normally?
N
1. Check if the fan terminal OFAN
is connected correctly
2. Resistance between any two
terminals is measure by an ohm
gauge and should be less than 1K
Ohm.
Y
Replace the fan
capacitor C1
Replace the
control panel AP1
Replace the
outdoor fan
End
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Power on the unit
Is stop time of the compressor
longer than 3 minutes?
Restart it up after
3 minutes
N
Y
Does startup fail?
Y
Are the wires for the compressor connected
correctly? Is connection sequence right?
N
Connect the wires as
per the connection
diagram
Y
Replace the control panel AP1
N
If the fault is eliminated?
N
Replace the
compressor
Y
End
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Out of step occurs once the
unit is powered on.
Out of step occurs in
operation
Is stop time of the
compressor longer than
3 minutes?
Is the outdoor fan working
normally?
Is the outdoor unit blocked
by foreign objects?
Are the wires for the compressor connected
correctly? Is connection sequence right?
Is the connection made in clockwise
direction?
Replace the
control panel AP1
Connect the
wires correctly
Replace the control
panel AP1
If the fault is eliminated?
If the fault is eliminated?
Replace the
compressor
Replace the
compressor
End
End
Check if the fan terminal
OFAN is connected correctly
Replace the fan
capacitor C1
Replace the
outdoor fan
Remove foreign objects
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20 minutes after the
complete unit is
powered off
Is the terminal FA for the
electronic expansion valve
connected correctly?
Connect the
wires correctly
Resistances between the first four pins
close to the terminal hole and the fifth
pin are almost the same, less than 100
ohm.
Replace the electronic
expansion valve
If the fault is eliminated?
Replace the
control panel
AP1
If the fault is eliminated?
Coolant leakage, refilling
the coolant
End
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Start
Check wiring of the
reactor (L) of the
outdoor unit and the
PFC capacitor
Whether there is any
damage or
short-circuit?
Y
Replace it as per the
wiring diagram and
reconnect the wires
If the fault is eliminated?
N
Remove the PFC capacitor
and measure resistance
between the two terminals.
Is the resistance around zero?
N
Y
The capacitor is
short circuited and
the capacitor
should be replaced
Restart the unit
If the fault is eliminated?
Y
N
Disconnect the terminals for the
reactor and measure the resistance
between the two terminals of the
reactor by an ohm gauge
Whether there is any damage
or short-circuit?
N
Y
Replace the reactor
Restart the unit
If the fault is eliminated?
Y
N
Replace the control
panel AP1
N
Y
End
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Start
Y
Did the equipment operate
normally before the failure
occurs?
N
Check the wiring of the indoor and
outdoor units with reference to the
wiring diagram
Check wiring inside of
the indoor and outdoor
units
Y
Is the connection right?
N
N
The AP1 voltage
detection circuit
is at fault
Y
Correctly connect the
corresponding wires for
the indoor and outdoor
units with reference to
the wiring diagram
Are wires broken?
N
If the fault is eliminated?
N
Check the communication
circuit of the outdoor unit
If the fault is eliminated?
The communication
circuit is abnormal
Y
N
Replace the main board
AP1 of the outdoor unit
If the fault is eliminated?
N
Replace the main board
of the indoor unit
Y
Y
End
Y
6TQWDNGUJQQVKPI
Appendix 1: Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Units(15K)
Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅
-19
138.1
20
18.75
59
3.848
98
1.071
-18
128.6
21
17.93
60
3.711
99
1.039
-17
121.6
22
17.14
61
3.579
100
1.009
-16
115
23
16.39
62
3.454
101
0.98
-15
108.7
24
15.68
63
3.333
102
0.952
-14
102.9
25
15
64
3.217
103
0.925
-13
97.4
26
14.36
65
3.105
104
0.898
-12
92.22
27
13.74
66
2.998
105
0.873
-11
87.35
28
13.16
67
2.896
106
0.848
-10
82.75
29
12.6
68
2.797
107
0.825
-9
78.43
30
12.07
69
2.702
108
0.802
-8
74.35
31
11.57
70
2.611
109
0.779
-7
70.5
32
11.09
71
2.523
110
0.758
-6
66.88
33
10.63
72
2.439
111
0.737
-5
63.46
34
10.2
73
2.358
112
0.717
-4
60.23
35
9.779
74
2.28
113
0.697
-3
57.18
36
9.382
75
2.206
114
0.678
-2
54.31
37
9.003
76
2.133
115
0.66
-1
51.59
38
8.642
77
2.064
116
0.642
0
49.02
39
8.297
78
1.997
117
0.625
1
46.6
40
7.967
79
1.933
118
0.608
2
44.31
41
7.653
80
1.871
119
0.592
3
42.14
42
7.352
81
1.811
120
0.577
4
40.09
43
7.065
82
1.754
121
0.561
5
38.15
44
6.791
83
1.699
122
0.547
6
36.32
45
6.529
84
1.645
123
0.532
7
34.58
46
6.278
85
1.594
124
0.519
8
32.94
47
6.038
86
1.544
125
0.505
9
31.38
48
5.809
87
1.497
126
0.492
10
29.9
49
5.589
88
1.451
127
0.48
11
28.51
50
5.379
89
1.408
128
0.467
12
27.18
51
5.197
90
1.363
129
0.456
13
25.92
52
4.986
91
1.322
130
0.444
14
24.73
53
4.802
92
1.282
131
0.433
15
23.6
54
4.625
93
1.244
132
0.422
16
22.53
55
4.456
94
1.207
133
0.412
17
21.51
56
4.294
95
1.171
134
0.401
18
20.54
57
4.139
96
1.136
135
0.391
19
19.63
58
3.99
97
1.103
136
0.382
6TQWDNGUJQQVKPI
Appendix 2: Resistance Table of Outdoor and Indoor Tube Temperature Sensors(20K)
Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅
-19
181.4
20
25.01
59
5.13
98
1.427
-18
171.4
21
23.9
60
4.948
99
1.386
-17
162.1
22
22.85
61
4.773
100
1.346
-16
153.3
23
21.85
62
4.605
101
1.307
-15
145
24
20.9
63
4.443
102
1.269
-14
137.2
25
20
64
4.289
103
1.233
-13
129.9
26
19.14
65
4.14
104
1.198
-12
123
27
18.13
66
3.998
105
1.164
-11
116.5
28
17.55
67
3.861
106
1.131
-10
110.3
29
16.8
68
3.729
107
1.099
-9
104.6
30
16.1
69
3.603
108
1.069
-8
99.13
31
15.43
70
3.481
109
1.039
-7
94
32
14.79
71
3.364
110
1.01
-6
89.17
33
14.18
72
3.252
111
0.983
-5
84.61
34
13.59
73
3.144
112
0.956
-4
80.31
35
13.04
74
3.04
113
0.93
-3
76.24
36
12.51
75
2.94
114
0.904
-2
72.41
37
12
76
2.844
115
0.88
-1
68.79
38
11.52
77
2.752
116
0.856
0
65.37
39
11.06
78
2.663
117
0.833
1
62.13
40
10.62
79
2.577
118
0.811
2
59.08
41
10.2
80
2.495
119
0.77
3
56.19
42
9.803
81
2.415
120
0.769
4
53.46
43
9.42
82
2.339
121
0.746
5
50.87
44
9.054
83
2.265
122
0.729
6
48.42
45
8.705
84
2.194
123
0.71
7
46.11
46
8.37
85
2.125
124
0.692
8
43.92
47
8.051
86
2.059
125
0.674
9
41.84
48
7.745
87
1.996
126
0.658
10
39.87
49
7.453
88
1.934
127
0.64
11
38.01
50
7.173
89
1.875
128
0.623
12
36.24
51
6.905
90
1.818
129
0.607
13
34.57
52
6.648
91
1.736
130
0.592
14
32.98
53
6.403
92
1.71
131
0.577
15
31.47
54
6.167
93
1.658
132
0.563
16
30.04
55
5.942
94
1.609
133
0.549
17
28.68
56
5.726
95
1.561
134
0.535
18
27.39
57
5.519
96
1.515
135
0.521
19
26.17
58
5.32
97
1.47
136
0.509
6TQWDNGUJQQVKPI
Appendix 3: Resistance Table of Outdoor Discharge Temperature Sensor(50K)
Temp.˄ć˅
Resistance
-29
˄kΩ˅
853.5
-28
-27
Temp.˄ć˅
Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅ Temp.˄ć˅ Resistance˄kΩ˅
10
98
49
18.34
88
4.754
799.8
11
93.42
50
17.65
89
4.609
750
12
89.07
51
16.99
90
4.469
-26
703.8
13
84.95
52
16.36
91
4.334
-25
660.8
14
81.05
53
15.75
92
4.204
-24
620.8
15
77.35
54
15.17
93
4.079
-23
580.6
16
73.83
55
14.62
94
3.958
-22
548.9
17
70.5
56
14.09
95
3.841
-21
516.6
18
67.34
57
13.58
96
3.728
-20
486.5
19
64.33
58
13.09
97
3.619
-19
458.3
20
61.48
59
12.62
98
3.514
-18
432
21
58.77
60
12.17
99
3.413
-17
407.4
22
56.19
61
11.74
100
3.315
-16
384.5
23
53.74
62
11.32
101
3.22
-15
362.9
24
51.41
63
10.93
102
3.129
-14
342.8
25
49.19
64
10.54
103
3.04
-13
323.9
26
47.08
65
10.18
104
2.955
-12
306.2
27
45.07
66
9.827
105
2.872
-11
289.6
28
43.16
67
9.489
106
2.792
-10
274
29
41.34
68
9.165
107
2.715
-9
259.3
30
39.61
69
8.854
108
2.64
-8
245.6
31
37.96
70
8.555
109
2.568
-7
232.6
32
36.38
71
8.268
110
2.498
-6
220.5
33
34.88
72
7.991
111
2.431
-5
209
34
33.45
73
7.726
112
2.365
-4
198.3
35
32.09
74
7.47
113
2.302
-3
199.1
36
30.79
75
7.224
114
2.241
-2
178.5
37
29.54
76
6.998
115
2.182
-1
169.5
38
28.36
77
6.761
116
2.124
0
161
39
27.23
78
6.542
117
2.069
1
153
40
26.15
79
6.331
118
2.015
2
145.4
41
25.11
80
6.129
119
1.963
3
138.3
42
24.13
81
5.933
120
1.912
4
131.5
43
23.19
82
5.746
121
1.863
5
125.1
44
22.29
83
5.565
122
1.816
6
119.1
45
21.43
84
5.39
123
1.77
7
113.4
46
20.6
85
5.222
124
1.725
8
108
47
19.81
86
5.06
125
1.682
9
102.8
48
19.06
87
4.904
126
1.64
Note: The information above is for reference only.
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