Klimaire KSIV SERIES Operating instructions

KSIV SERIES
TROUBLESHOOTING
SERVICE MANUAL

Contents
1. Safety Caution .......................................................................................................3
2. General Troubleshooting ......................................................................................4
3. Complain Record Form ..........................................................................................6
4. Information Inquiry ...............................................................................................8
5. Error Diagnosis and Troubleshooting Without Error Code...............................11
5.1 Remote maintenance...................................................................................11
5.2 Field maintenance .......................................................................................12
6. Quick Maintenance by Error Code......................................................................17
7. Troubleshooting by Error Code...........................................................................18
7.1 E0 / F4 (EEPROM parameter error diagnosis and solution) ............................18
7.2 E1 (Indoor and outdoor unit communication error diagnosis and solution)...19
7.3 E2 (Zero-crossing detection error diagnosis and solution) .............................21
7.4 E3 / F5 (Fan speed is operating outside of the normal range diagnosis and
solution)......................................................................................................22
7.5 E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis
and solution) ...............................................................................................25
7.6 E7 (Indoor PCB / Display board communication error diagnosis and solution)26
7.7 EC (Refrigerant Leakage Detection diagnosis and solution) ..........................27
Troubleshooting

Contents
7.8 F0 (Overload current protection diagnosis and solution)...............................28
7.9 P0 (IPM malfunction or IGBT over-strong current protection diagnosis and
solution)......................................................................................................29
7.10 P1 (Over voltage or too low voltage protection diagnosis and solution)........30
7.11 P2 (High temperature protection of IPM module diagnosis and solution)......31
7.12 P4 (Inverter compressor drive error diagnosis and solution) ..........................32
8. Check Procedures.................................................................................................33
Troubleshooting

Troubleshooting 3 
1. Safety Caution
WARNING
Be sure to turn off all power supplies or disconnect all wires to avoid electric shock.
While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist
strap to avoid damage to the board.
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
Test the voltage between P and N on back of the main PCB with multimeter. If the voltage is 36V, the capacitors are fully
discharged.
Note: This picture is for reference only. Actual appearance may vary.

Troubleshooting 4 
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer
lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following
table:
Operation
Lamp
Timer
Lamp Display Error Information Solution
1 time OFF E0 Indoor unit EEPROM parameter error TS18
2 times OFF E1 Indoor / outdoor unit communication error TS19
3 times OFF E2 Zero-crossing signal detection error(for some models) TS21
4 times OFF E3 The indoor fan speed is operating outside of the normal range TS22
5 times OFF E4 Indoor room temperature sensor T1 is in open circuit or has short
circuited TS25
6 times OFF E5 Evaporator coil temperature sensor T2 is in open circuit or has short
circuited TS25
9 times OFF E7 Indoor PCB / Display board communication error TS26
7 times OFF EC Refrigerant leak detected TS27
1 times ON F0 Current overload protection TS28
2 times ON F1 Outdoor room temperature sensor T4 is in open circuit or has short
circuited TS25
3 times ON F2 Condenser coil temperature sensor T3 is in open circuit or has short
circuited TS25
4 times ON F3 Compressor discharge temperature sensor TP is in open circuit or has
short circuited TS25
5 times ON F4 Outdoor unit EEPROM parameter error TS18
6 times ON F5 The outdoor fan speed is operating outside of the normal range(for
some models) TS22
1 times FLASH P0 IPM malfunction or IGBT over-strong current protection TS29
2 times FLASH P1 Over voltage or over low voltage protection TS30
3 times FLASH P2 High temperature protection of IPM module TS31
5 times FLASH P4 Inverter compressor drive error TS32
For other errors:
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a
temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.
If the unit responds, the display board requires replacement.

Troubleshooting 5 
2.2 Error Display (For 18K And Above 18K Outdoor Unit)
There are 2 LED lights (RED color and GREEN color) welded in outdoor main board. After power on, LED show different
actions when encounter different problems.
No. Problem LED(GREEN) LED(RED) Solution
1 Standby normally ON OFF -
2 Operate normally OFF ON -
3 Compressor driven chip EEPROM parameter error ON FLASH TS18
4 IPM malfunction or IGBT over-strong current protection Flash OFF TS29
5 Over voltage or too low voltage protection ON ON TS30
6 Inverter compressor drive error OFF FLASH TS32
7 Inverter compressor drive error Flash LIGHT TS32
8Communication error between outdoor main chip and
compressor driven chip flash FLASH TS18

Troubleshooting 6 
3. Complain Record Form
Complain Record Form
Request No.: Date:
Installation Date: Service Date:
Customer Information
Name Telephone No.
Home Address
Email
Product Information
Indoor Unit Model Outdoor Unit Model
Serial No. of indoor unit
Serial No. of outdoor unit
Working Mode □Cooling □Heating □Fan only □Dry
Setting temperature °C / °F Fan speed □Turbo □High □Medium □Low
□Auto
Temperature of air inlet °C / °F Temperature of air
outlet °C / °F
Installation / Condition Information
Indoor temperature °C / °F Indoor humidity %RH
Outdoor temperature °C / °F Outdoor humidity %RH
Length of Connecting pipe Pipe diameter Gas pipe: Liquid pipe:
Length of Wiring wire diameter
System Running Pressure MPa or Bar or PSI
Room size (L*W*H)
Photo of Installation of In-
door unit
(Photo #1)
Photo of Installation
of Outdoor unit
(Photo #2)
Failure Description
Error Code of Indoor unit Code of Outdoor
PCB
Unit does not start
Remote control does not work
Indoor display shows nothing
No cooling or heating at all
Less cooling or heating
Unit starts but stops shortly
High noise
High vibration

Troubleshooting 7 
Parameter Checking information by Remote controller
Displaying code Displaying code meaning Display value Display value meaning
T1 Room temperature
T2 Indoor coil temperature
T3 Outdoor coil temperature
T4 Ambient temperature
Tb Outlet temperature of
indoor coil
TP Discharge temperature
TH Sunction temperature
FT Targeted Frequency
Fr Actual Frequency
IF Indoor fan speed
OF Outdoor fan speed
LA EXV opening steps
CT Compressor continuous
running time
ST Causes of compressor
stop.
A0, A1, 0, 1, 2, 3, 4, 5,
6, L, A, U, T Reserved
Approval from Manufacturer
□Approved
□More Proof needed
□Rejected

Troubleshooting 8 
4. Information Inquiry
• To enter information inquiry status, complete the following procedure within ten seconds:
• Press LED(or DO NOT DISTURB) 3 times.
• Press SWING(or AIR DIRECTION) 3 times.
• Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter
checking mode.
• Use the LED(or DO NOT DISTURB) and SWING(or AIR DIRECTION) buttons to cycle through information displayed.
• Pressing LED(or DO NOT DISTURB) will display the next code in the sequence. Pressing SWING(or AIR DIRECTION) will
show the previous.
• The following table shows information codes. The screen will display this code for two seconds, then the information
for 25 seconds.

Troubleshooting 9 
Displayed code Explanation Displayed
value Meaning Additional Notes
T1
T2
T3
T4
Tb
TP
TH
FT
Fr
Room temperature
-1F,-1E,-1d,-1c,-
1b,-1A
-19—99
A0,A1,…A9
b0,b1,…b9
c0,c1,…c9
d0,d1,…d9
E0,E1,…E9
F0,F1,…F9
-25,-24,-23,-22,
-21,-20
-19—99
100,101,…109
110,111,…119
120,121,…129
130,131,…139
140,141,…149
150,151,…159
1. All displayed temperatures
use actual values.
2. All temperatures are
displayed in °C regardless
of remote used.
3. T1, T2, T3, T4, and T2B
display ranges from -25 to
70 °C. TP display ranges
from -20 to 130 °C.
4. The frequency display
ranges from 0 to 159HZ.
5. If the actual values exceed
or fall short of the defined
range, the values closest
to the maximum and
minimum values will be
displayed.
Indoor coil
temperature
Outdoor coil
temperature
Ambient
temperature
Outlet temperature
of indoor coil
Discharge
temperature
Suction temperature
Targeted frequency
Actual frequency
IF Indoor fan speed
0
1,2,3,4
14-FF
OFF
Low speed, Medium
speed, High speed,
Turbo.
Actual fan speed is
equal to the display
value converted to
decimal value and
multiplied by 10. This
is measured in RPM.
N/A
Used for some large capacity
motors.
Used for some small capacity
motors.
The display value is 14-FF
(hexadecimal). The
corresponding fan speed
ranges from 200 to 2550RPM.
OF Outdoor fan speed
LA EXV opening angle 0-FF
Actual EXV opening
value is equal to
the display value
converted to decimal
value and then
multiplied by 2.
-
CT
Compressor
continuous running
time
0-FF 0-255 minutes
If the actual value exceeds
or falls short of the defined
range, the value closest to the
maximum and minimum will
be displayed.
ST Causes of
compressor stop 0-99
For a detailed
explanation, contact
technical support.
-

Troubleshooting 10 
Displayed code Explanation Displayed
value Meaning Additional Notes
A0
Reserved
0-FF
2-28
5-20
5-25
- -
A1
0
1
2
3
4
5
6
L
A
U
T
A
5
T

Troubleshooting 11 
5. Error Diagnosis and Troubleshooting Without Error Code
WARNING
Be sure to turn off unit before any maintenance to prevent damage or injury.
5.1 Remote maintenance
SUGGESTION: When troubles occur, please check the following points with customers before field maintenance.
No. Problem Solution
1 Unit will not start TS13 - TS14
2 The power switch is on but fans will not start TS13 - TS14
3 The temperature on the display board cannot be set TS13 - TS14
4 Unit is on but the wind is not cold(hot) TS13 - TS14
5 Unit runs, but shortly stops TS13 - TS14
6 The unit starts up and stops frequently TS13 - TS14
7 Unit runs continuously but insufficient cooling(heating) TS13 - TS14
8 Cool can not change to heat TS13 - TS14
9 Unit is noisy TS13 - TS14

Troubleshooting 12 
5.2 Field maintenance
Problem Solution
1 Unit will not start TS15 - TS16
2 Compressor will not start but fans run TS15 - TS16
3 Compressor and condenser (outdoor) fan will not start TS15 - TS16
4Evaporator (indoor) fan will not start TS15 - TS16
5 Condenser (Outdoor) fan will not start TS15 - TS16
6 Unit runs, but shortly stops TS15 - TS16
7 Compressor short-cycles due to overload TS15 - TS16
8 High discharge pressure TS15 - TS16
9 Low discharge pressure TS15 - TS16
10 High suction pressure TS15 - TS16
11 Low suction pressure TS15 - TS16
12 Unit runs continuously but insufficient cooling TS15 - TS16
13 Too cool TS15 - TS16
14 Compressor is noisy TS15 - TS16
15 Horizontal louver can not revolve TS15 - TS16

Troubleshooting 13 
1.Remote Maintenance
Possible causes of trouble
Power failure
The main power tripped
Loose connections
Faulty transformer
The voltage is too high or too low
The remote control is powered off
Broken remote control
Dirty air filter
Dirty condenser fins
The setting temperature is higher/lower than the room's(cooling/heating)
The ambient temperature is too high/low when the mode is cooling/heating
Fan mode
SILENCE function is activated(optional function)
Frosting and defrosting frequently
Unit will not start ☆☆☆☆
The power switch is on but fans will not start ☆☆☆
The temperature on the display board cannot be set ☆ ☆
Unit is on but the wind is not cold(hot) ☆ ☆ ☆
Unit runs, but shortly stops ☆ ☆ ☆
The unit starts up and stops frequently ☆ ☆ ☆
Unit runs continuously but insufficient cooling(heating) ☆ ☆ ☆ ☆ ☆
Cool can not change to heat
Unit is noisy
Test method / remedy
Test voltage
Close the power switch
Inspect connections - tighten
Change the transformer
Test voltage
Replace the battery of the remote control
Replace the remote control
Clean or replace
Clean
Adjust the setting temperature
Turn the AC later
Adjust to cool mode
Turn off SILENCE function.
Turn the AC later
Refrigerant Circuit
Electrical Circuit

Troubleshooting 14 
1.Remote Maintenance
Possible causes of trouble
Heavy load condition
Loosen hold down bolts and / or screws
Bad airproof
The air inlet or outlet of either unit is blocked
Interference from cell phone towers and remote boosters
Shipping plates remain attached
Unit will not start
The power switch is on but fans will not start ☆
The temperature on the display board cannot be set
Unit is on but the wind is not cold(hot)
Unit runs, but shortly stops
The unit starts up and stops frequently ☆
Unit runs continuously but insufficient cooling(heating) ☆ ☆ ☆
Cool can not change to heat
Unit is noisy ☆ ☆
Test method / remedy
Check heat load
Tighten bolts or screws
Close all the windows and doors
Remove the obstacles
Reconnect the power or press ON/OFF button on remote control to restart operation
Remove them
Others

Troubleshooting 15 
2.Field Maintenance
Possible causes of trouble
Power failure
Blown fuse or varistor
Loose connections
Shorted or broken wires
Safety device opens
Faulty thermostat / room temperature sensor
Wrong setting place of temperature sensor
Faulty transformer
Shorted or open capacitor
Faulty magnetic contactor for compressor
Faulty magnetic contactor for fan
Low voltage
Faulty stepping motor
Shorted or grounded compressor
Shorted or grounded fan motor
Unit will not start ☆☆☆☆☆ ☆
Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆
Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆
Evaporator (indoor) fan will not start ☆ ☆ ☆ ☆
Condenser (Outdoor) fan will not start ☆ ☆ ☆ ☆ ☆
Unit runs, but shortly stops ☆ ☆
Compressor short-cycles due to overload ☆ ☆
High discharge pressure
Low discharge pressure
High suction pressure
Low suction pressure
Unit runs continuously but insufficient cooling
Too cool ☆ ☆
Compressor is noisy
Horizontal louver can not revolve ☆ ☆ ☆
Test method / remedy
Test voltage
Inspect fuse type & size
Inspect connections - tighten
Test circuits with tester
Test continuity of safety device
Test continuity of thermostat / sensor & wiring
Place the temperature sensor at the central of the air inlet grille
Check control circuit with tester
Check capacitor with tester
Test continuity of coil & contacts
Test continuity of coil & contacts
Test voltage
Replace the stepping motor
Check resistance with multimeter
Check resistance with multimeter
Electrical Circuit

Troubleshooting 16 
2.Field Maintenance
Possible causes of trouble
Compressor stuck
Shortage of refrigerant
Restricted liquid line
Dirty air filter
Dirty evaporator coil
Insufficient air through evaporator coil
Overcharge of refrigerant
Dirty or partially blocked condenser
Air or incompressible gas in refrigerant cycle
Short cycling of condensing air
High temperature condensing medium
Insufficient condensing medium
Broken compressor internal parts
Inefficient compressor
Expansion valve obstructed
Expansion valve or capillary tube closed completely
Leaking power element on expansion valve
Poor installation of feeler bulb
Heavy load condition
Loosen hold down bolts and / or screws
Shipping plates remain attached
Poor choices of capacity
Contact of piping with other piping or external plate
Unit will not start
Compressor will not start but fans run ☆
Compressor and condenser (outdoor) fan will not
start
Evaporator (indoor) fan will not start
Condenser (Outdoor) fan will not start
Unit runs, but shortly stops ☆ ☆ ☆ ☆ ☆ ☆
Compressor short-cycles due to overload ☆ ☆ ☆
High discharge pressure ☆☆☆☆☆☆
Low discharge pressure ☆ ☆
High suction pressure ☆ ☆ ☆ ☆
Low suction pressure ☆☆☆☆☆ ☆☆☆
Unit runs continuously but insufficient cooling ☆☆☆☆☆ ☆☆☆ ☆ ☆ ☆
Too cool
Compressor is noisy ☆ ☆ ☆ ☆ ☆
Horizontal louver can not revolve
Test method / remedy
Replace the compressor
Leak test
Replace restricted part
Clean or replace
Clean coil
Check fan
Change charged refrigerant volume
Clean condenser or remove obstacle
Purge, evacuate and recharge
Remove obstruction to air flow
Remove obstruction in air or water flow
Remove obstruction in air or water flow
Replace compressor
Test compressor efficiency
Replace valve
Replace valve
Replace valve
Fix feeler bulb
Check heat load
Tighten bolts or screws
Remove them
Choose AC of lager capacity or add the number of AC
Rectify piping so as not to contact each other or with external plate
Refrigerant Circuit
Others

Troubleshooting 17 
6. Quick Maintenance by Error Code
If you do not have the time to test which specific parts are faulty, you can directly change the required parts according
the error code.
You can find the parts to replace by error code in the following table.
Part requiring replacement
Error Code
E0 E1 E2 E3 E4 E5 E7 EC F0
Indoor PCB x
Outdoor PCB x xxxxxx
Display board xxxxxx xx
Indoor fan motor xxx xxxxx
Outdoor fan motor xxxxxxxxx
T1 sensor xxxx xxxx
T2 Sensor xxxxx x x
T3 Sensor xxxxxxxxx
T4 Sensor xxxxxxxxx
TP Sensor xxxxxxxxx
Reactor x xxxxxxx
Compressor xxxxxxxx
Additional refrigerant xxxxxxx x
Part requiring replacement F1 F2 F3 F4 F5 P0 P1 P2 P4
Indoor PCB xxxxxxxxx
Outdoor PCB
Indoor fan motor xxxxxxxxx
Outdoor fan motor x x x x x x
T3 Sensor x xxxxxxx
T4 Sensor xxxxxxxx
TP Sensor xx xxxxxx
Reactor xxxxxx xx
Compressor xxxxx xx
IPM module board xxxxx
Additional refrigerant xxxxxxxxx
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.

Troubleshooting 18 
7. Troubleshooting by Error Code
7.1 E0 / F4 (EEPROM parameter error diagnosis and solution)
Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
Troubleshooting and repair:
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
YES
Replace the indoor main
PCB(E0) /outdoor main
PCB(F4).
The unit is operating normally.
NO
Remarks:
EEPROM: A read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
The location of the EEPROM chip on the indoor and outdoor PCB is shown in the following two images:
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole. This pictures are only for reference, actual appearance may vary.
Troubleshooting and repair of compressor driven chip EEPROM parameter error and communication error
between outdoor main chip and compressor driven chip are same as F4.

Troubleshooting 19 
7.2 E1 (Indoor and outdoor unit communication error diagnosis and solution)
Description: Indoor unit can not communicate with outdoor unit
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
• Reactor
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Does a problem remain? The unit is operating normally
NO
Measure Vs. (Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
YES
Is the voltage moving
alternately between Positive and
negative?
Check the outdoor wiring connection.
Is it normal?
Check the reactor.
YES
Is it normal?
Replace the outdoor PCB.
Power on.
YES
Is the error
resolved?
Replace the indoor PCB.
NO
Replace the
reactor NO
Check the indoor wiring
connections
Is it normal?
Replace the indoor PCB.
Power on.
YES
Is the error resolved?
Replace the outdoor PCB.
NO
The voltage moves alternately with
positive value.
NO
The voltage is a
certain value
NO
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.