EQK EAC4H36R2C Programming manual

Thank you very much for purchasing our air conditioner. Please read this owen's manual carefully before
using your air conditioner.
Model No.: EAC2H18R2C
EAC4H36R2C
EAC3H24R2C
EAC5H42R2C
Multi Zone Mini Split Air Conditioner
Troubleshooting Manual

Troubleshooting
2
THANK YOU
Congratulations on your purchase and welcome to the Family.
Your new Air Conditioner combines high-efficiency operation with portable convenience.
By following the operating and care instructions in this manual, your air conditioner will
provide you with many years of reliable service.
Please visit our website www.eqkhvac.com
For any questions or Technical Support,
please contact us by mail [email protected] or by phone [phone].

2
Trouble guide
TROUBLESHOOTING
TTroubleshooting for normal malfunction
Troubleshooting Possible Reason of Abnormality How to Deal With
Air conditioner can not start up
1. Power supply failure;
2. Trip of breaker or blow of fuse；
3. Power voltage is too low;
4. Improper setting of remote
controller ;
5. Remote controller is short of
power.
1. Check power supply circuit;
2. Measure insulation resistance to
ground to see if there is any
leakage;
3. Check if there is a defective
contact or leak current in the
power supply circuit;
4. Check and set remote
controller again;
5. Change batteries.
The compressor starts or
stops frequently
The air inlet and outlet has been
blocked. Remove block obstacles.
Poor cooling/heating
1. The outdoor heat exchanger is
dirty, such as condenser;
2.
3.
There are heating devices indoors；
The air tightness is not enough.
People come in and out too
frequently.
4. Block of outdoor heat exchanger;
5. Improper setting of temperature.
1. Clean the heat exchanger of the
outdoor unit, such as condenser ;
2. Remove heating devices;
3. Keep certain air tightness indoors;
4. Remove block obstacles;
5. Check and try to set temperature
again.
Sound from deforming parts
During system starting or stopping, a
sound might be heard. However, this
is due to thermal deformation of
plastic parts.
It is not abnormal, and the sound will
disappear soon.
Water leakage
1. Drainage pipe blocked or broken;
2. Wrap of refrigerant pipe joint is not
closed completely.
1. Change drainage pipe.
2. Re-wrap and make it tight.

3
TROUBLESHOOTING
When the air conditioner failure occurs, the fault code will displays on control board.
TO CHECK CODES
1) EAC2H18R2C
2) EAC2H18R2C EAC4H36R2C EAC3H24R2C EAC5H42R2C
Drive failure indicator
Main control failure indicator
Main Control Board
Main control failure
Fault code will display on 7 segment display on outdoor control board.
Outdoor
Control Board
7 segment
display

4
TROUBLESHOOTING
Drive fault code display
s
�
�

5
TROUBLESHOOTING
Fault codes
The following is the fault code table of outdoor units.
Table 1 Outdoor fault code
Fault
code Fault description Possible reasons for abnormality How to deal with Remarks
1
Outdoor ambient
temperature sensor
fault
1.The outdoor ambient temperature
sensor is connected loosely;
2.The outdoor ambient temperature
sensor fails to work;
3.The sampling circuit fails.
1.Reconnect the outdoor
ambient temperature sensor;
2.Replace the outdoor ambient
temperature sensor
components;
3.Replace the outdoor control
board components.
2
Outdoor coil
temperature sensor
fault
1.The outdoor coil temperature
sensor is connected loosely;
2.The outdoor coil temperature
sensor fails to work;
3.The sampling circuit fails.
1.Reconnect the outdoor coil
temperature sensor;
2.Replace the outdoor coil
temperature sensor
components;
3.Replace the outdoor control
board components.
3 The unit over-current
turn off fault
1. Control board current sampling
circuit fails;
2. The current is over high because
the supply voltage is too low;
3. The compressor is blocked;
4. Overload in cooling mode;
5. Overload in heating mode.
1. Replace the electrical control
board components;
2. Normally protection
3. Replace the compressor
4. Please see the Note 3
5. Please see the Note 4
4 EEprom Data error
1.EE components fails;
2.EE components control circuit
fails;
3.EE components are inserted
incorrectly.
1.Replace the EE components;
2.Replace the outdoor control
board components;
3.Reassembly the EE
components.
5
Cooling freezing
protection (the indoor
coil temperature is too
low) or heating
overload (indoor coil
temperature is too
high)
1.The indoor unit can not blow air
normally;
2.The room temperature is too low in
cooling mode or the room
temperature is too high in heating;
3.The filter is dirty;
4.The duct resistance is too high to
result in low air flow;
5.The setting fan speed is too low;
6.The indoor unit is not installed in
accordance with the installation
standards, and the air inlet is too
close to the air outlet .
1.Check whether the indoor fan,
indoor fan motor and
evaporator work normally;
2.Normal protection;
3.Clean the filter;
4.Check the volume control
valve, duct length etc.;
5.Set the speed with high speed;
6.Reinstall the indoor unit
referring to the user manual to
change the distance between
the indoor unit and the wall or
ceiling.
7
The communication
fault between the
indoor unit and
outdoor unit
1.
2.
The connection cable is connected
improperly between the indoor unit
and outdoor unit;
The communication cable is
connected loosely;
3.The communication cable fails;
4.The indoor control board fails;
5.The outdoor control board fails;
6.Communication circuit fuse open;
7.The specification of
communication cable is incorrect.
1.
2.
3.
Reconnect the connection
cable referring to the wiring
diagram;
Reconnect the communication
cable;
Replace the communication
cable;
4.Replace the indoor control
board;
5.Replace the outdoor control
board;
6.Check the communication
circuit, adjust the DIP switch
and the short-circuit fuse.
7.Choose suitable
communication cable
referring to the user manual

6
TROUBLESHOOTING
Fault
code Fault description Possible reasonsfor abnormality How to deal with Remarks
13 Compressor overheat
protector device
1. The wiring of the overload
protector is connected loosely.
2. The overload protector fails .
3. The refrigerant is not enough;
4. The installation pipe is much
longer than the normal one, but
extra refrigerant is not added ;
5. The expansion valve fails;
6. The outdoor control board fails.
1. Reconnect the wiring of the
overload protector;
2. Replace the overload
protector;
3. Check the welding point of the
unit to confirm whether it is
leakage, and then recharge
the refrigerant;
4. Add the refrigerant;
5. Replace expansion valve;
6. Replace the outdoor control
board.
14
The high pressure
switch operation or
the unit is turned off
for high pressure
protection
1.
2.
The wiring of the high pressure
protector is connected loosely;
The high pressure protector
fails;
3.The outdoor control board is
abnormal;
4. Overload in cooling;
5. Overload in heating.
1.
2.
Reconnect the wiring of the
high pressure protector;
Replace the high pressure
protector;
3. Replace the outdoor control
board;
4. Please refer to the Note 3;
5. Please refer to the Note 4.
Applied to
models with
high
pressure
switch or
pressure
sensor
16 Overload protection
in cooling mode System overload Please refer to the Note 3.
17
Discharge
temperature sensor
fault
1.The wiring of the discharge
temperature sensor is connected
loosely;
2.The discharge temperature sensor
fails;
3.The sampling circuit is abnormal.
18 AC voltage is
abnormal
1.The AC voltage>275V or <160V.
2.The AC voltage of sampling circuit
on the driver board is abnormal.
1. Normal protection, please
check the supply power;
2. Replace the driver board.
19 Suction temperature
sensor fault
1.The wiring of the suction tempe-
rature sensor is connected loosely;
2.The suction temperature sensor
fails;
3.The sampling circuit is abnormal.
1.Reconnect the wiring of the
suction temperature sensor;
2.Replace the suction
temperature sensor;
3.Replace the outdoor control
board.
22 The defrosting sensor
fault
1.The wiring of the defrosting sensor
is connected loosely;
2.The defrosting sensor fails;
3.The sampling circuit is abnormal.
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the defrosting sensor;
3. Replace the outdoor control
board.
1. Reconnect the wiring of the
discharge temperature sensor;
2. Replace the discharge
temperature sensor fails;
3. The sampling circuit is
abnormal.
23 Expansion valve A
tube (thin) sensor
fault
1. The wiring of the sensor for the
expansion valve A(thin tube)
connect loose;
2. The sensor for the expansion
A(thin tube) is failure;
3. The sampling circuit is
abnormally
1. Reconnect the wiring of the
sensor for the expansion valve
A (thin tube);
2. Replace the sensor for the
expansion valve A (thin tube);
3. Replace the outdoor control
board.
24 Expansion valve B
(thin)tube sensor fault
1. The wiring of the sensor for the
expansion valve B (thin tube)
connect loose;
2.The sensor for the expansion valve
B(thin tube) is failure;
3.The sampling circuit is abnormally
1. Reconnect the wiring of the
sensor for the expansion valve
B(thin tube);
2.Replace the sensor for the
expansion valve B(thin tube);
3. Replace the outdoor control
board.

7
TROUBLESHOOTING
( )
( )
. You can check the driver
board LED to further aze
the fault code of the drive board
and to learn about what leads to the
fault and how to operate it
information can be n in
dr s for adwemarks

8
TROUBLESHOOTING
dr s for adwemarks
1.
is
ed ly
2.
s
3. s
4. s
Too high d
that the
is longer.
3. fails
4.
.
1.
2.
ring
1. connecting
is
2. per
fails;
3. per fails
4. per
s
5.
per
per
Lacking of
.ring
1. connecting
is
2. s
3. s
4.
fails.

9
TROUBLESHOOTING
Fault
code Fault description
Possible reasons f orabnormality How to deal with Remarks
74 Indoor EEPROM
Data 2 fault
EE in MCU is fails, the unit
can run, but the function user
has set is ineffective.
Replace EE data in MCU.
81
Indoor ambient
Temperature
Sensor Fault
1. The cable of the room
temperature sensor is connect
loosely;
2. The room temperature sensor
fails;
3. The sampling circuit is abnormal.
1. Reconnect the cable of the
roomtemperature sensor;
2. Replace the room temperature
sensor;
3. Replace the indoor control
board.
83
Evaporator Middle
Temperature
Sensor Fault
1.The cable of the coil temperature
sensor of the evaporator fails;
2.The coil temperature sensor of
the evaporator fails;
3.The sampling circuit is abnormal.
1. Reconnect the cable of the
coil temperature sensor of the
evaporator;
2. Replace the coil
temperature sensor of the
evaporator;
3. Replace the indoor
control board.
FE
(254)
Communication
between main
control board &
Wired controller
Fault (display on
wired controller)
1. The wired controller and the
indoor control board are
connected loosely.
2. The sequence of the wiring
between the wired controller
to the indoor control board is
wrong;
3. The wiring between the
wired controller to the indoor
control board fails;
4. The wired controller is fails;
5. The indoor control board
is abnormal.
1.
2.
Reconnect the wiring between
the wired controller to the
indoor control board;
Replace the wiring between
the wired controller to the
indoor control board;
3. Replace the wiring between
the wired controller to the
indoor control board;
4. Replace the wired controller;
5. Replace the indoor control
Board.
ER
Communication
between main
control board
& display board
Fault (displays on
display board)
1.The wiring between the display
board to the indoor control
board is connected loosely;
2.The sequence of the wiring
between the display board to the
indoor control board is wrong;
3.The wiring between the display
board to the indoor control
board fails;
4.The display board fails;
5.The indoor control board fails.
1. Reconnect the wiring
between the display board
to the indoor control board;
2. Replace the wiring between
the display board to the
indoor control board;
3. Replace the wiring between
the display board to the
indoor control board;
4. Replace the display board;
5. Replace the indoor control
board.

10
TROUBLESHOOTING
NOTE 1:
If the indoor unit can not start or the indoor unit stops itself after 30s, at the same time the unit do
not display the fault code, please check the fire and the socket of the control board.
NOTE 2:
If the indoor unit displays the 75,76,77,78 fault code after you turn on the unit, please check the
TEST seat of the indoor control board or the TEST detection circuit to see whether short circuit
occurs.
NOTE 3: Overload in cooling mode
Overload in cooling mode
sr. The root cause Corrective measure
1 The refrigerant is excessive. Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
2 The outdoor ambient temperature is too high. Please use within allowable temperature range
3 Short-circuit occurs in the air outlet and air inlet of
the outdoor unit.
Adjust the installation of the outdoor unit
referring to the user manual.
4 The outdoor heat exchanger is dirty, such
as condenser.
Clean the heat exchanger of the outdoor unit,
such as condenser.
5 The speed of the outdoor fan motor is too low. Check the outdoor fan motor and fan capacitor.
6 The outdoor fan is broken or the outdoor fan
is blocked. Check the outdoor fan.
7 The air inlet and outlet has been blocked. Remove the blocked objects.
8 The expansion valve or the capillary fails. Replace the expansion valve or the capillary.
NOTE 4: Over load in heating mode
Overload in heating mode
sr. The root cause Corrective measure
1 The refrigerant is excessive. Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
2 The indoor ambient temperature is too high. Please use within allowable temperature range.
3 Short-circuit occurs in the air outlet and air
inlet of the indoor unit.
Adjust the installation of the indoor unit referring
to the user manual.
4 The indoor filter is dirty. Clean the indoor filter.
5 The speed of the indoor fan motor is too low. Check the indoor fan motor and fan capacitor.
6 The indoor fan is broken or the outdoor fan
is blocked. Check the indoor fan.
7 The air inlet and outlet has been blocked. Remove the blocked objects.
8 The expansion valve or the capillary fails. Replace the expansion valve or the capillary.

12
TROUBLESHOOTING
Table 3 Drive fault code (18K)
Fault
code Fault description Possible reasonsfor abnormality How to deal with
1 Inverter DC voltage overload fault 1. Power supply input is too high
or too low;
2. Driver board fault.
1. Check power supply
2. Change driver board.
2 Inverter DC low voltage fault
3 Inverter AC current overload fault
4 Out-of-step detection
1. Compressor phase lost；
2. Bad driver board components；
3. The compressor insulation fault
1. Check compressor wire
connection;
2. Change driver board；
3. Change compressor.
5 Loss phase detection fault (speed
pulsation)
6 Loss phase detection fault (current
imbalance)
7 Inverter IPM fault (edge) 1. System overload or current
overload;
2. Driver board fault.
3. Compressor oil shortage,
serious wear of crankshaft ;
4. The compressor insulation fault.
1. Check the system.
2. Change driver board;
3. Change the compressor;
4. Change the compressor.
8 Inverter IPM fault (level)
9 PFC_IPM IPM fault (edge)
10 PFC_IPM IPM fault (level)
11 PFC power detection of failure
1. The power supply is not stable;
2. Instantaneous power off;
3. Driver board failure.
1. Check the power supply.
2. No need to deal with.
3. Change the driver board.
12 PFC overload current detection of
failure.
1. System overload, current is
too high;
2. Driver board fails;
3. PFC fails.
1.Check the system;
2.Change the driver board;
3.Change the PFC.
13 DC voltage detected abnormal . 1. Input voltage is too high or too
low;
2. Driver board fails.
1. Check the power supply.
2. Change the driver board.
14 PFC LOW voltage detected
failure.
15 AD offset abnormal detected
failure.
Driver board fails. Change the driver board.
16 Inverter PWM logic set fault.
17 Inverter PWM initialization failure
18 PFC_PWM logic set fault.
19 PFC_PWM initialization fault.
20 Temperature abnormal.
21 Shunt resistance unbalance
adjustment fault
22 Communication failure.
1. Communication wire connection
is not proper.
2. Driver board fails.
3. Control board fails.
1. Check the wiring.
2. Change the driver board.
3. Change the control board.
23 Motor parameters setting of failure Initialization abnormal. Reset the power supply.
25 EE data abnormal Driver board EEPROM abnormal 1. Change EEPROM；
2. Change driver board.
26 DC voltage mutation error 1. Power input changes suddenly
2. Driver board fails.
1.Check power supply, to provide
stable power supply;
2.Change driver board.
27 D axis current control error
1. System overload, phase current
is too high;
2. Driver board fails.
1. Check system if normally.
2. Check stop valve if is open;
3. Change driver board.
28 Q axis current control error
1. System overload, phase current
is too high；
2. Driver board fails.
1. Check system if normally.
2. Check stop valve if is open;
3. Change driver board.
29 Saturation error of d axis current
control integral
1. System overload suddenly;
2. Compressor parameter is
not suitable;
3. Driver board fails.
1. Check system if normally.
2. Check stop valve if is open;
3. Change driver board.
30 Saturation error of q axis current
control integral
1. System overload suddenly;
2. Compressor parameter is
not suitable;
3. Driver board fails.
1. Check system if normally.
2. Check stop valve if is open;
3. Change driver board.

13
TROUBLESHOOTING
Table 4 DriveFault Code (24K/36K/42K)
Fault
code Fault description Possible reasons for abnormality How to deal with
failure in
drive control
1. C is not ed
properly
2.
3.
4.
5.
6. fails.
1.
2.
3. the
is d
4.
5.
6.
2 failure in drive control
1.
2.
3. .
2.
3.
3
4 failure in drive control
1.
2.
3. ils.
1.
2. ils
3.
4.
2.
3.
2.
3.
1. is
2. ils
1. is
2.
ils
1.
2. ils2.
1. is
2.
3.
2.
3.
1. is
2.
3.
4.
2.
3.
4.
1. is
2.
3.
4.
2.
3.
4.
1. is
2.
3.
2.
3.
3.
4.
2.
3.
4.
off 2.
3.

14
TROUBLESHOOTING
Fault
code Fault description Possible reasons for abnormality How to deal with
16 Low DC voltage 200V 1. Voltage input is too low;
2. Drive board fault.
1. Check the power supply.
2. Change the driver board.
18 Driver board read EE
data error
1. EEPROM has no data or data error;
2. EEPROM circuit fault.
1. Change EEPROM component;
2. Change the driver board.
19 PFC chip receive data
fault Abnormal communication loop. Change the drive board.
20 PFC soft start
abnormal Abnormal PFC drive loop. Change the drive board.
21
The compressor drive
chip could not receive
data from PFC chip.
Communication loop fault. Change the drive board.

Emerson Quiet Kool Co. Ltd.
120 US- 46 Parsippany-Troy
Hills, NJ 07054
Toll Free 1-888-493-0305
Version Update：--2021.5.0