Cooper&Hunter | CH09ACE230V | Troubleshooting Sheet | Cooper&Hunter CH09ACE230V TroubleShooting Sheet

INSTALLATION
AND
MAINTENANCE
TROUBLESHOOTING
Content:
1.1 Error Code List
1.2 Troubleshooting for Main Malfunction
1.3 Troubleshooting for Normal Malfunction
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1
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Display Method of Indoor Unit
NO.
1
2
3
Name
E1
Antifreezing
protection
E2
In defect of
refrigerant
4
5
Overcurrent
protection
6
Communication
Malfunction
7
High
temperature
resistant
protection
8
EEPROM
malfunction
9
Limit/
decrease
frequency
due to high
temperature
of module
Malfunction
protection of
jumper cap
Unit
Indicator has 3 kinds of
display status and during
Indicator Display (during
Dual-8 blinking, ON 0.5s and OFF
blinking, ON 0.5s and OFF
Code 0.5s)
0.5s
Display
Power
Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
High
pressure
protection of
system
High
discharge
temperature
protection of
compressor
10
2
Malfunction
Display Method of Outdoor
A/C status
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation.
During heating operation, the
complete unit stops.
OFF 3s
and blink
once
OFF 3S
and blink
twice
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates.
OFF 1S
and blink
3 times
OFF 1S
and
blink
9 times
F0
Possible Causes
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including
and bad radiating environment );
Ambient temperature is too high.
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
1.In defect of refrigerant;
The Dual-8 Code Display will 2.Indoor evaporator temperature
show F0 and the complete unit sensor works abnormally;
stops.
3.The unit has been plugged up
somewhere.
E4
OFF 3S
and blink
4 times
OFF 1S
and blink
7 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
Please refer to the malfunction
analysis (discharge protection,
overload).
E5
OFF 3S
and blink
5
times
OFF 1S
and blink
5 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and
load is too high;
3. Evaporator is dirty.
E6
OFF 3S
and blink
6
times
Always
ON
During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation, the
complete unit stops.
Refer to the corresponding
malfunction analysis.
E8
OFF 3S
and blink
8
times
OFF 1S
and blink
6 times
During cooling operation:
compressor will stop while
indoor fan will operate.
During heating operation, the
complete unit stops.
Refer to the malfunction analysis
(overload, high temperature
resistant).
OFF 3S OFF 1S
and blink and blink
15 times 11 times
EE
OFF 3S OFF 3S
and blink and blink
6 times 6 times
EU
C5
OFF 3S
and blink
15 times
During cooling and drying
operation, compressor will stop
Replace outdoor control panel AP1
while indoor fan will operate;
During heating operation, the
complete unit will stop
All loads operate normally,
while
operation frequency for
compressor is decreased
Wireless remote receiver and
button are effective, but can
not dispose the related
command
Discharging after the complete unit
is de-energized for 20mins, check
whether the thermal grease on
IPM Module of outdoor control
the radiator is inserted tightly.
If its no use, please replace control
panel AP1.
1. No jumper cap insert on
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
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Display Method of Indoor Unit
NO.
11
12
Malfunction
Name
Gathering
refrigerant
Indoor
ambient
temperature
sensor is
open/short
circuited
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Indicator Display (during
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Power
Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Fo
F1
OFF 3S OFF 3S
and blink and blink
1 times 1 times
13
1. Loosening or bad contact of
indoor ambient temp. sensor and
During cooling and drying
mainboard terminal.
operation, indoor unit operates
2. Components in mainboard fell
while other loads will stop;
down leads short circuit.
during heating operation,
3. Indoor ambient temp. sensor
the complete unit will stop
damaged.(check with sensor
operation.
resistance value chart)
4. Mainboard damaged.
OFF 3S
and blink
once
AC stops operation once
reaches the setting
F2
temperature. Cooling, drying:
internal fan motor stops
OFF 3S
and blink
twice
operation while other loads
stop operation; heating: AC
stop operation
open/short
circuited
14
15
Outdoor
ambient
temperature
sensor is
open/short
circuited
Outdoor
condenser
temperature
sensor is
open/short
circuited
16
Outdoor
discharge
temperature
sensor is
open/short
circuited
17
Limit/
decrease
frequency
due to
overload
18
Decrease
frequency
due to
overcurrent
F3
OFF 3S
and blink
3 times
F4
OFF 3S
and blink
4 times
Possible Causes
When the outdoor unit receive
signal of Gathering refrigerant
,the system will be forced to
Nominal cooling mode
run under cooling mode for
gathering refrigerant
OFF 1S
and blink
17 times
Indoor
evaporator
temperature
sensor is
A/C status
OFF 1S
and
blink
6 times
OFF 1S
and
blink
5 times
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
1. Loosening or bad contact of
Indoor
evaporator temp. sensor and
mainboard terminal.
2. Components on the mainboard
fall
down leads short circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value
chart for testing)
4. Mainboard damaged.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
F5
OFF 3S
and blink
5 times
OFF 1S
and
blink
7 times
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.
F6
OFF 3S
and blink
for 6
times
OFF 1S
and
blink
3 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
F8
OFF 3S
and blink
8 times
OFF 1S
and
blink
once
All loads operate normally,
while
operation frequency for
compressor is decreased
The input supply voltage is too low;
System pressure is too high and
overload
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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
3
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Display Method of Indoor Unit
NO.
Malfunction
Name
Indicator Display (during
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Power
Cool
Heating
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Yellow
Red
A/C status
Possible Causes
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Decrease
19
frequency
due to
F9
high air
discharge
Limit/
decrease
20
frequency
due to
antifreezing
FH
Voltage for
21
DC bus-bar
is too high
PH
OFF 1S
and
blink
twice
OFF 3S
and blink
9 times
OFF 1S
and
blink
4 times
OFF 3S OFF 3S
and blink and blink
2 times 2 times
OFF 1S
and
blink
13 times
OFF 3S
and blink
11 times
All loads operate normally,
while
operation frequency for
compressor is decreased
All loads operate normally,
while operation frequency for
compressor is decreased
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
During cooling and drying
operation, compressor will stop on the unit after the supply voltage
is increased to the normal range.
while indoor fan will operate;
2.If the AC input is normal,
During heating operation, the
measure the voltage of electrolytic
complete unit will stop
capacitor C on control panel (AP1),
if its normal, theres malfunction
operation.
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
22
Voltage of
DC bus-bar
is too low
OFF 3S
and blink
21 times
PL
OFF 1S
and
blink
12 times
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
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)
4
23
Compressor
Min
frequence in
test state
24
Compressor
rated
frequence in
test state
25
Compressor
maximum
frequence in
test state
P0
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
P1
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during nominal cooling or
nominal heating test
P2
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during max. cooling or
max. heating test
Showing during min. cooling or
min. heating test
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Display Method of Indoor Unit
NO.
Malfunction
Name
Indicator Display (during
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
26
Compressor
intermediate
frequence in
P3
test state
27
28
Overcurrent
protection of
phase
current for
compressor
Charging
malfunction
of capacitor
P5
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
29
30
Module high
temperature
protection
Possible Causes
Power
Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during middle cooling or
middle heating test
During cooling and drying
Refer to the malfunction
operation, compressor will stop
analysis (IPM protection, loss
while indoor fan will operate;
of synchronism protection and
During heating operation, the
overcurrent protection of phase
complete unit will stop
current for compressor.
operation.
OFF 3S
and blink
15 times
During cooling and drying
PU
OFF 3S
and blink
17 times
Malfunction
of module
temperature
sensor circuit
A/C status
0.5s
P7
P8
OFF 3S
and blink
18 times
OFF 3S
and blink
19 times
operation, compressor will stop
Refer to the part three—charging
while indoor fan will operate;
malfunction analysis of capacitor
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Replace outdoor control panel AP1
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
After the complete unit is deenergized for 20mins, check
whether the thermal grease on IPM
Module of outdoor control panel
radiator is inserted tightly. If its no
use, please replace control panel
AP1.
Decrease
31
frequency
due to high
temperature
resistant
during
OFF 3S
H0
and blink
10 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction analysis
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)
(overload, high temperature
resistant)
heating
operation
32
33
Static
dedusting
protection
Overload
protection for
compressor
H2
H3
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OFF 3S
and blink
twice
OFF 3S OFF 1S
and blink and blink
3 times 8 times
5
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Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Power
Cool
Heating
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Yellow
Red
A/C status
Possible Causes
Green
Indicator Indicator Indicator Indicator Indicator Indicator
During cooling and drying
34
System is
abnormal
operation, compressor will stop
OFF 3S OFF 1S
and blink and blink
4 times 6 times
H4
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
During cooling and drying
operation, compressor will stop
35
IPM
protection
OFF 3S OFF 1S
and blink and blink
5 times 4 times
H5
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
36
Module
temperature
Refer to the malfunction analysis
(overload, high temperature
resistant)
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
OFF 3S OFF 1S
and blink and blink
5 times 10 times
H5
is too high
1. Bad contact of DC motor
Internal motor
37
(fan motor) do
not operate
H6
OFF 3S
and blink
11 times
Desynchro38
39
nizing of
compressor
PFC
protection
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
operation.
OFF 3S
H7
and blink
7 times
OFF 3S OFF 1S
and blink and blink
6 times 14 times
HC
Outdoor DC
OFF 1S
and
blink
14 times
feedback terminal.
2. Bad contact of DC motor
control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
Refer to the malfunction analysis
DC fan motor malfunction or
Outdoor DC fan motor
malfunction lead to compressor system blocked or the connector
stop operation,
loosed
L3
OFF 3S
and blink
23 times
41
power
protection
L9
OFF 3S
and blink
20 times
OFF 1S
and blink
9 times
compressor stop operation and
To protect the electronical
Outdoor fan motor will stop
components when detect high
30s latter , 3 minutes latter
fan motor and compressor will power
restart
42
Indoor unit
and outdoor
unit doesn't
match
LP
OFF 3S
and blink
19 times
OFF 1S
and blink
16 times
compressor and Outdoor fan
motor can’t work
40
43
6
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present
location.
fan motor
malfunction
Failure startup
LC
OFF 3S
and blink
11 times
Indoor unit and outdoor unit doesn't
match
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Refer to the malfunction analysis
During heating operation, the
complete unit will stop
operation.
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Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
44
Malfunction of
phase current
detection
circuit for
compressor
45
Malfunction of
voltage
dropping for
DC bus-bar
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
Dual-8 blinking, ON 0.5s and OFF
blinking, ON 0.5s and OFF
Code 0.5s)
0.5s
Display
Power
Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
U1
U3
A/C status
Possible Causes
OFF 3S
and blink
13 times
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Replace outdoor control panel AP1
During heating operation, the
complete unit will stop
OFF 3S
and blink
20 times
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Supply voltage is unstable
During heating operation, the
complete unit will stop
During cooling and drying
46
Malfunction
of complete
units current
detection
operation, the compressor will
stop while indoor fan will
OFF 3S
and blink
13 times
U5
operate;
During heating operating,
the complete unit will stop
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.
operation.
If this malfunction occurs
The four-way
47
valve is
abnormal
OFF 3S
and blink
20 times
U7
1.Supply voltage is lower than
AC175V;
during
2.Wiring terminal 4V is loosened or
heating operation, the complete broken;
3.4V is damaged, please replace
unit will stop operation.
4V.
48
Zerocrossing
malfunction of
U9
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
OFF 3S
and blink
18 times
outdoor unit
Frequency
OFF 1S
and blink
13 times
49
limiting
(power)
50
Compressor
running
51
The
temperature
for turning
on the unit is
reached
OFF 1S
and blink
8 times
52
Frequency
limiting
(module
temperature)
OFF 1S
and blink
11 times
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Replace outdoor control panel AP1
OFF 1S
and blink
once
7
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Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
Dual-8 blinking, ON 0.5s and OFF
0.5s and OFF 0.5s
Code 0.5s)
Cool
Heating Yellow
Red
Green
Display Power
Indicator Indicator Indicator Indicator Indicator Indicator
Possible Causes
OFF 0.5S
and blink
once
Normal
53
A/C status
communication
Defrosting will occur in
heating
54
8
Defrosting
H1
OFF 3S OFF 1S
and blink and blink
once
twice
mode. Compressor will
operate
while indoor fan will stop
operation.
Its the normal state
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Troubleshooting for
F1,F2 malfunction
Is
the wiring terminal between the
temperature sensor and the controller
loosened or poorly contacted?
yes
Insert the temperature
sensor tightly
no
no
Is there short circuit due to trip-over of
the parts?
Is malfunction
eliminated
yes
Make the parts upright
no
no
Is the
temperature sensor normal according
to the Resistance
Table?
Is malfunction
eliminated
yes
no
Replace it with a
temperature sensor
with the same model
yes
no
Is malfunction
removed
yes
Replace the mainboard
with the same model.
yes
End
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9
7URXEOHVKRRWLQJ
0DOIXQFWLRQRI%ORFNHG3URWHFWLRQRI,'8)DQ0RWRU+
Troubleshooting for
H6 malfunction
Stir the blade
with a tool to see whether
the blade rotates
smoothly
yes
no
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
Is malfunction
eliminated
no
Check if the connection of PG
motor feedback terminal is firm.
yes
no
Insert the control
terminal of PG
motor tightly
yes
Is malfunction
eliminated
no
Check if the connection
of PG motor control
terminal is firm.
yes
no
Reinstall the blade and
motor correctly
yes
no
Turn on the
unit again ; measure whether the output
voltage on control terminal for PG motor
is more than 50V within 1 min after the
louvers are opened
Is malfunction
eliminated
yes
yes
yes
Measure the voltage of this foot to neutral
wire on the mainboard
yes
Is the motor
started up
no
no
Replace PG motor
no
Is malfunction
eliminated
yes
Replace the mainboard
with the same model.
End
10
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Troubleshooting for C5
malfunction
Is there jumper cap on the
mainboard?
no
Assemble the jumper
cap with the same
model
yes
Is malfunction
eliminated
no
Is
the jumper cap inserted
correctly and
tightly ?
no
Insert the
jumper cap
tightly
yes
no
Is malfunction
eliminated
yes
Replace the jumper cap
with the same model
yes
Is malfunction
eliminated
yes
no
Replace the mainboard
with the same model.
End
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11
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Troubleshooting
for U8 malfunction
Re-energize1
minute after
de-erergization
U8 is still
displayed
No
The unit returns to normal.
Conclusion:U8 is displayed due
to instant energization afte deenergization while the capacitor
discharges slowly.
Yes
The zero-cross detection
circuit of the mainboard is
defined abnormal.Replace
the mainboard with the same
model
End
12
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Start
Cut off power supply. Check if
connection line of IDU and ODU
and the wire inside electric box
are correctly connected.
Correct connection?
Connect the line
according to
wiring diagram.
no
Malfunction eliminated?
yes
no
Main board matches
with display board? Main board of
IDU matches with that of ODU?
no
Match correctly
according to product
specification
Malfunction eliminated?
yes
Malfunction eliminated?
yes
yes
no
yes
Communication cord is damaged?
no
Replace
communication
cord
no
Replace IDU's
main board
yes
Malfunction eliminated?
no
Replace ODU's
main board.
yes
End
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13
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Main inspection point:
Flow chart of Malfunction diagnosis
Energize the unit
and wait for 3min
Measure voltage between
N 1and 3 of indoor
wiring block
Voltage > 200V?
Measure voltage
between L and N
of outdoor wiring
block
Y
N
Normal wiring?
Voltage > 200V?
N
Y
Indoor main board error
N
Y
Outdoor electric
box error
Adjust wiring
Replace main board
of indoor unit
Replace outdoor
electric box
indoor and outdoor
wiring error
Replace indoor
and outdoor wiring
Remove malfunction
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(2) Indoor fan does not rotate and there is no feedback
Main detection point:
Is the control panel reliably connected with the motor? Is it loose? Is the connecting sequence correct?
Is the input voltage within the normal range (measure the voltage between L and N of the wiring block XT with AC voltage
gauge.)?
Malfunction diagnosis process:
14
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7URXEOHVKRRWLQJ
Energize the
unit and start it
Voltage between
L and N of
indoor wiring
block
Check the
connecting
state of the
connecting
terminal
Y
Voltage > 200V?
Reliable
connection
N
N
Adjust
connecting
state
Y
Check power
supply
Replace main
board of indoor
unit
N
Remove the
error?
N
remove the
error?
Y
Replace motor
Y
Finish
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(3) Temperature sensor malfunction
Main detection points:
Is outdoor ambient temperature within the normal range?
Is indoor and outdoor fan running normally?
Is the radiating environment inside and outside the unit good enough?
Malfunction diagnosis process:
Energize the
unit and start
it
Indoor unit
display F1/F2
Check connecting
state of indoor
temperature
sensor
Y
N
reliable
connected?
Indoor unit
display F4/F5
N
Adjust
connecting state
Y
Check connecting state of
outdoor temperature sensor
Reliable
connected?
Y
N
Adjust
connecting state
Replace
temperature
sensor
Remove error?
Remove error?
N
Remove error?
Y
Replace
Tesmepnesroar
ture Sensor?
N
Y
N
Remove error?
Replace main
boarudn iotf indoor
N
Y
Y
Y
Replace parts
of outdoor
electric box
Finish
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15
7URXEOHVKRRWLQJ
Energize the
unit and start it
0DOIXQFWLRQGLDJQRVLVRIVWDUWXSIDLOXUH
(4) Malfunction diagnosis of startup failure
Main detection points:
Is wiring of compressor correct.
Is the stop time
of compressor more
than 3min
Is the stop time of compressor enough?
Is compressor damaged?
N
Start it 3 min later
Y
Malfunction diagnosis process:
N
Startup failure?
Y
N
Is compressor wire connected correctly?
Connect it according
to wiring diagram
Y
Replace parts of outdoor
electric box
Remove the error?
Y
N
Replace
compressor
finish
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(5) Diagnosis of losing synchronism for compressor
Main detection points:
Is pressure of the system too high?
Is voltage too low?
Malfunction diagnosis process:
Losing synchronism
upon startup of
the unit
Is the stop time
of compressor more
than 3min
N
Losing synchronism
during running
N
Is outdoor fan normal?
Is fan well
connected?
Y
Y
Is wire of compressor
well connected?
Y
Remove
stuff
Reliable
connected?
N
Is outdoor fan
blocked by
stuff?
Y
N
Replace parts
of outdoor
electric box
Replace parts
of outdoor
electric box
N
Y
Adjust
connecting wire
Replace parts
of outdoor
electric box
Y
Remove error?
Remove error?
N
Y
Remove error?
N
N
Replace
compressor
Y
Replace
outdoor fan
Replace
compressor
Finish
Finish
16
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(6) Diagnosis of overload and discharge malfunction
Main detection points:
Is electric expansion valve well connected? Is it damaged?
20min after
de-energization
of complete unit
Is refrigerant leaked?
Is overload wire connection normal?
Malfunction diagnosis process:
Is electric
expansion valve
well connected?
N
Y
Is overload wire
reliably connected?
N
Y
Adjust
connecting wire
Replace electric
expansion valve
Remove
malfunction?
Y
N
Replace parts
of outdoor
electric box
Remove malfunction?
Y
N
Refrigerant leakage,
recharge the
refrigerant
Finish
(7) Detection process of communication circuit of outdoor unit
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