Midea MPA-08CE User manual

Service Manual
Mobile type
GD Midea Refrigeration Equipment Co.,Ltd.
Model applied:
MPA-08CE
MPA-08CR
MPA-08EE
MPA-08ER

CONTENTS
1. PREFACE
1.1 SAFETY PRECAUTIONS..................................................................................1
1.2 INSULATION RESISTANCE TEST......................................................................1
1.3 SPECIFICATIONS............................................................................................2
1.4 FEATURES......................................................................................................4
1.5 DISPLAY PANEL AND REMOTE CONTROL........................................................4
2. INSTALLATION
2.1 NAMES OF PARTS...........................................................................................5
2.2 WINDOW INSTALLATION.................................................................................6
3. TROUBLESHOOTING GUIDE
3.1 PIPING SYSTEM..............................................................................................7
3.2 ELECTRIC FUNCTION......................................................................................7
3.3 TROUBLESHOOTING GUIDE............................................................................8
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM.........................................................................................13
5. EXPLODED VIEW AND REPLACEMENT
PARTS LIST.................................................. ....................................................14
1.PREFACE
This SERVICE MANUAL provides various service information, including the mechanical and electrical
parts etc. This room air conditioner was manufactured and assembledunder a strictquality control system.
The refrigerant ischarged at the factory. Be sure toread the safetyprecautions prior to servicing the unit.
1.1 SAFETY PRECAUTIONS
1. When servicing the unit, set the POWER SWITCH to OFF and unplug the power cord.
2. Observe theoriginal lead dress.
If a shortcircuit is found, replace all partswhich have beenoverheated or damaged by the shortcircuit.
3. Afterservicing the unit, make an insulationresistance test toprotect the customer from being exposedto
shock hazards.
1.2 INSULATION RESISTANCE TEST
1. Unplug thepower cord and connect a jumperbetween 2 pins(black and white).
2. The grounding conductor (yellow/green) is to be open.
3. Measure theresistance value with an ohm metrebetween the jumpedlead and each exposed metallic part
on the equipmentat all the positions.
4. The value should be over 1M .
1

MPA-08CE MPA-08CR
Ph-V-Hz 115V,60Hz 115V,60Hz
Capacity Btu/h 8000 8000
Input W850 850
Rated current A7.4 7.4
EER Btu/w.h 9.4 9.4
Capacity Btu/h ----------------- -----------------
Input W----------------- -----------------
Rated current A----------------- -----------------
COP Btu/w.h ----------------- -----------------
L/h 1.1 1.1
L5.5 5.5
A39.7 39.7
Model EH120X1C-1BRU2 EH120X1C-1BRU2
Capacity Btu/h 8735 8735
Input W840 840
Rated current(RLA) A7.4 7.4
Thermal protector UP3QE0591-T36 UP3QE0591-T36
Capacitor uF 45uF/ 250V 45uF/ 250V
g550 550
MPa 2.1/0.9 2.1/0.9
Model YSK40-6A-1 YSK40-6A-1
Input W97/81/76/67 97/81/76/67
Capacitor uF 8uF/ 250V 8uF/ 250V
Speed(hi/mi/lo) r/min 1120/1060/1000/700 1120/1060/1000/700
m3/h 320 320
dB(A) 52 52
a.Number of rows 2 2
b.Tube pitch(a)x row pitch(b) mm 22X19.05 22X19.05
c.Fin spacing mm 1.4 1.4
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm ?7.94x0.35, innergroove tube ?7.94x0.35, innergroove tube
f.Coil length x height x width mm 274x264x38.1 274x264x38.1
g.Number of circuits 1 1
a.Number of rows 2 2
b.Tube pitch(a)x row pitch(b) mm 25.4x22 25.4x22
c.Fin spacing mm 1.5 1.5
d.Fin type (code) Unhydrophilic aluminium Unhydrophilic aluminium
e.Tube outside dia.and type mm ?9.52x0.27, innergroove tube ?9.52x0.27, innergroove tube
f.Coil length x height x width mm 497x304.8x22 515x304.8x22 497x304.8x22 515x304.8x22
g.Number of circuits 1 1
mm 387×830×456 387×830×456
Kg 37 37
℃17-30 17-30
℃10-35 10-35
m212-18 12-18
Model
Power supply
Cooling
Heating
Moisture Removal
Water tank volume
Starting current
Compressor
Refrigerant type
Design pressure
Fan motor
Indoor air flow (Hi/Mi/Lo)
1.3 SPECIFICATION
2
Net weight
Operation temp
Ambient temp
Application area
Noise level (Hi/Mi/Lo)
Evaporator
Condenser
Dimension (W*H*D)

MPA-08EE MPA-08ER
Ph-V-Hz 115V,60Hz 115V,60Hz
Capacity Btu/h 8000 8000
Input W850 850
Rated current A7.4 7.4
EER Btu/w.h 9.4 9.4
Capacity Btu/h 5000 5000
Input W1500 1500
Rated current A13.0 13.0
COP Btu/w.h ----------------- -----------------
L/h 1.1 1.1
L5.5 5.5
A39.7 39.7
Model EH120X1C-1BRU2 EH120X1C-1BRU2
Capacity Btu/h 8735 8735
Input W840 840
Rated current(RLA) A7.4 7.4
Thermal protector UP3QE0591-T36 UP3QE0591-T36
Capacitor uF 45uF/ 250V 45uF/ 250V
g550 550
MPa 2.1/0.9 2.1/0.9
Model YSK40-6A-1 YSK40-6A-1
Input W97/81/76/67 97/81/76/67
Capacitor uF 8uF/ 250V 8uF/ 250V
Speed(hi/mi/lo) r/min 1120/1060/1000/700 1120/1060/1000/700
m3/h 320 320
dB(A) 52 52
a.Number of rows 2 2
b.Tube pitch(a)x row pitch(b) mm 22X19.05 22X19.05
c.Fin spacing mm 1.4 1.4
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm ?7.94x0.35, innergroove tube ?7.94x0.35, innergroove tube
f.Coil length x height x width mm 274x264x38.1 274x264x38.1
g.Number of circuits 1 1
a.Number of rows 2 2
b.Tube pitch(a)x row pitch(b) mm 25.4x22 25.4x22
c.Fin spacing mm 1.5 1.5
d.Fin type (code) Unhydrophilic aluminium Unhydrophilic aluminium
e.Tube outside dia.and type mm ?9.52x0.27, innergroove tube ?9.52x0.27, innergroove tube
f.Coil length x height x width mm 497x304.8x22 515x304.8x22 497x304.8x22 515x304.8x22
g.Number of circuits 1 1
mm 387×830×456 387×830×456
Kg 37 37
℃17-30 17-30
℃≤35 ≤35
m212-18 12-18
Model
Power supply
Cooling
Heating
Moisture Removal
Water tank volume
Starting current
Compressor
Refrigerant type
Design pressure
Fan motor
Indoor air flow (Hi/Mi/Lo)
3
Net weight
Operation temp
Ambient temp
Application area
Noise level (Hi/Mi/Lo)
Evaporator
Condenser
Dimension (W*H*D)

1.4 FEATURES
All the modelshave two typesof the coverand panel
structure.
No need forspecial installation. Fourcasters on the
bottom for easymovement and simpleand convenient
use.
Only one exhaustpipe, and easierto use.
Remote-controlled or gentle-touchkeys for easyand
comfortable use.
Compressors of famousbrands are adoptedfor reliability
and low noise.
Multiple uses: dehumidifyingand cloth drying.
The heating systemuses PTC electricalheater and willnot
be affected by ambient temperature,which saves energy.
Suitable for localcooling and heating.
Large volume tank,and convenient touse.
1.5 DISPLAY PANEL ANDREMOTE CONTROL
DISPLAYPANEL
15432
1
Signal receiver
2Heat/cool/dry lamp
3
Water full lamp
4Operation display
51/0 button
AUTO COOL DRY HEAT FAN
TEMP
CLOCK
SPEED
AUTO LOW MED HIGH
MODE
1/0
TEMP/TIMER
FAN
SWING
CLOCK
SET
REMOTE CONTROL
6
8
5
6
7
D
E
F
G
H
A
9
I
6
Remote display
7
Mode button
8
9
Fan button
A
B
C
Swing button
D
Up button
E
Clock button
F
Reset button
GLock button
H
I
Timer on button
Timer off button
Display the situationof operation setting.
Select the operationmode, AUTO, COOL, DRY, HEAT
and FAN.
Press this buttonto operation the unit, again to stop.
Select the Fanspeed, AUTO, LOW, MED, HIGH.
Press this buttonto activate the auto swing, again to
stop.
Press this buttonto increase the setting temperature
or Timertime.
Press this buttonto activate the time setting.
Press this buttonto reset all settings to original.
Press this buttonto lock all button except this button.
Press this buttonto activating TIMER ON timesetting.
Press this buttonto activating TIMER OFF timesetting.
WATER FULL
HEAT
COOL
DRY
1/0
FAN
SWING
MODE
ON
TIMER
OFF CLOCK
TEMP./CLOCK
AD .
J
LR
Oo
C/ F
789ABCD
Down button
Press this buttonto decrease thesetting temperature
or Timertime.
Set button
Press this buttonto activate theTime ON/OFFsetting.
Oo
C/ F button
Press this buttonto select temperaturesettings in
either Celsius or Farenheight .
````````
4

Note: The Rear View and Side View as well as the performance of above styles are same as that of base style.
2.1 NAMES OF PARTS
The following models all are based on the model MPA-08CE and model MPA-O8EE Only change the external style.
FRONT VIEW
FRONT VIEW
FRONT VIEW
B Style
TOP
COVER
DRAIN TANK
FRONT VIEW REAR VIEW
Base Style
ILLUMINATED
CONTROL PANEL
OSCILLATING
AIR VENTS
HANDLE
RECESS
DRAIN
TANK
CASTERS
AC POWER
CORD
EXHAUST AIR
OUTLET
SIDE VIEW
FILTER
COVER
A Style
TOP
COVER
OPERATION
COVER
DRAIN TANK
CASTERS
C Style
TOP
COVER
DRAIN
TANK
2. INSTALLATION
Installation Accessories
Description Quantity
Flexible exhaust hose with adapters..............3/set
13
stretches from 19 / " (50cm) up to 78 / " (200cm)
24
Window exhaust adapter(flat mouth)...............1Pc
Adjustable window/patio door slider kit.........2/set
53
from26 / " (67.5cm) up to 48 / "(203cm)
88
Drain hose connector.......................................1 Pc
continuous drain option (hose not included)
SPECIAL NOTE: Exterior drain hose extension
(direct drain) is not included with this unit and can
be purchased through any local Hardware Store.
Installation Accessories
Drain Hose Connector
Window Exhaust
Adapter
Adapter
Adapter
Adjustable Window/Patio Door Slider Kit
53
26/"-48/
88
”
Flexible Exhaust Hose
13
19 / - 78 /
24
"
Adjustable Window/Patio Door Slider Kit
53
26 / - 48 /
88
”
"
"
"
5

Window Kit Installation
Your window kit has been designed to fit most standard
"vertical"and "horizontal" window applications. However,
it may be necessary for you to improvise/modify some
aspects of the installation procedures for certain types
of windows. Please refer to Fig. 2 & Fig. 2a for minimum
and maximum window openings.
Before Starting This Unit
1) Select a suitable location, making sure you have easy
access to an electrical outlet.
2) Install the Flexible Exhaust Hose and the Adjustable
Window Slider Kit as depicted.
NOTE: Step 2 is required only while using the AIR
CONDITIONER MODE
3) Plug the unit into a 115V/60Hz grounded electrical
outlet.
DO NOT USE AN EXTENSION CORD.
4) Make sure the Water Tank is correctly positioned inside
the cabinet otherwise the unit will not operate.
5) To turn the unit on, pressthe I/O key (On/ Off Switch).
Water Tank Safety Feature
This unit is equipped with a fail-safe switch mechanism
which prevents the unit from condensing water in the
event the water tank is accidentally displaced, and/or
FULL with water. If this situation occurs, the unit will
signal 8 BEEPS and the WATER FULL indicator light
will flash red continuously until the water tank is correctly
positioned and/or emptied.
NOTE: The fan motor will continue to operate under this
condition. This is normal, but no cooling or
dehumidifying will occur until the tank is emptied and/or
correctly installed (It may take several minutes before the
compressor resumes normal operation).
2.2 Window Installation
Window Slider Kit
5
Minimum: 26 / "(67.5 cm )
8
3
Maximum: 48 / "(123cm)
8
Window Slider Kit
5
Minimum: 26 / "(67.5 cm )
8
3
Maximum: 48 / "(123cm)
8
Horizontal Window
Vertical
Window
6

3. TROUBLE SHOOTING GUIDE
3.1 PIPING SYSTEM
The figure belowis a briefdescription of the important components and their function inwhat is calledthe refrigeration system.
This will helpto understand therefrigeration cycle and the flow of the refrigerant inthe cooling cycle.
ROOM AIR CONDITIONER
CYCLE OF REFRIGERATION
EVAPORATOR
COMPLETE LIQUID BOIL
OFF POINT
COOLED
AIR
ROOM AIR HEAT LOAD
LIQUID
PRESSURE
DROP
(LIQUID REFRIGERANT)
CAPILLARY
OIL
COMPRESSOR
MOTOR
SUCTION LINE
COOL LOW
PRESSURE VAPOR
OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH
LIQUID OUTLET
HIGH PRESSURE VAPOR
LIQUID REFRIGERANT
LOW PRESSURE VAPOR
HOT DISCHARGE
AIR
VAPOR INLET CONDENSER
3.2 ELECTRIC FUNCTION
3.2.1 Operational modes
3.2.1.1 Cooling mode
The air flow speed canbe set athigh, medium and
low; the fancan run continuallyin accordance with
the air flowspeed.
oo
The temperature can be setfrom 16 C ~ -32 C.
The compressor starts operation whenthe ambient
temperature is higherthan setpoint +1 . Whenthe
ambient temperature islower than thesetpoint, the
compressor stops.
3.2.1.2 Heating mode
The air flow speed canbe set athigh or low;the fan
actually operates atlow and superlow speed. When
the ambient temperatureis higher thanthe setpoint,
the fan stops.
oo
The temperature can be setfrom 16 C ~ 32 C.
When the ambienttemperature is lowerthan set-
point -1 ,the PTC heaterbegins to work;when the
ambient temperature ishigher than thesetpoint,
the PTC heaterstops.
3.2.1.3 Dehumidifying mode
oo
The temperature can be setfrom 10 C ~32 C.
The fan works at mediumspeed; the working
conditions of thecompressor are thesame as those
in cooling mode.
3.2.1.4 Fan onlymode
The fan can run athigh, medium orlow speed.
````
``
``
3.2.1
THE SETTING OFTIMER AND CLOCK
3.2.2.1
THE SETTING OFAUTO SWING
When the airconditioner is operating,press the
SWING key atany mode tostart the autoswing
3.2.2
OFF TIMER
Set the OFFTIMER at any mode whenthe air-
condition is operating.
Press TIMER OFF or SET, the LEDwill display
TIMER OFF and flash withthe close-down time.
Press TIMER up or TIMER down continually, you
can adjust theclose-down time.
Press CLOCK key, you can verify the close-down
time.
3.2.2.2 ON TIMER
Set the startingup time beforeclosing down the air
conditioner.And its startingup status will be the
working status oflast time.
Press TIMER ON or SET, the LED will display
TIMER ON and flash withthe operation time.
Press TIMER up or TIMER down continually, you
can adjust theclose-down time.
Press CLOCK key, you can verify the operationtime.
3.2.2.3 CLOCK
The clock displays time inthe 24-hour systemwith
flashing at 1Hz.
Setting:
At anymode, press andhold the CLOCK key for
more than 3seconds, the clockdisplay will flash at
1 Hz. Then press TIMER up or TIMER down,you
can adjust time.
Verifying:
Press CLOCK toverify.
3.2.3 TEMPERATURE SETTING
At cooling,dehumidifying or heatingmode, you can
set the temperature.Press TEMP up key once, the
o
set-point increases for1 C; press TEMP down key
o
once, the set-pointdecreases for 1 C.
3.2.4 FORCED OPERATION
3.2.4.1 When thepower is turnedon for thefirst time and no
other keys arepressed, press bothCLOCK and
TEMP up. The machine instantly enters forced
heating mode.
3.2.4.2 When thepower is turnedon for thefirst time and
no other keysare pressed, pressboth CLOCK and
TEMP down. The machine instantly enters forced
cooling mode.
3.2.4.3 During theforced operation, youcan set airflow,
auto swing, etc.
3.2.4.4 During theforced operation, pressTEMP up or TEMP
down. You can seethe pipe temperature Pxx and
room temperature Rxxat clock position.
3.2.4.5 Press I/Okey or whenthe forced operationhas
lasted for 30minutes, the machineenters into
standby.
7

3.2.5 PROTECTIVE FUNCTIONS
3.2.5.1 ALARMON WATER TANK LEVER
At anymode, when the water tank level is up tothe
limit, the buzzeralarms 8 times before it stops, the
alarm lamp flashesand the machineenters into air
blowing. (At heatingmode, the machine keeps
original status.) The machine restoresto former
operating status afterthe alarms gooff. After 3
minutes, if thealarms can notgo off, the machine
will enter intostandby automatically.
3.2.5.2 LOW TEMPERATURE PROTECTION FOR THE
EVAPORATOR
At coolingand dehumidifying modes, if the pipe
o
temperature is lowerthan -3 C after compressor
runs for 10minutes, the compressor will be shut
down instantly, the fan will start athigh speed and
the green LEDwill flash at 1 Hz. When the pipe
o
temperature goes upto 10 C, the alarmgoes off
and the machineoperates at set conditions.
3.2.5.3 HIGH TEMPERATURE PROTECTION
At heatingmode, when the temperature at air outlet
is too high,the PTC will be turned off (without
turning off the fan); whenthe temperature lowers
to normal, thePTC returns to work.
At heatingmode, when the temperature above the
PTC is toohigh, the thermal fuse will be burnt out
and the powersupply to PTC will be cut off.
At heatingmode, when the temperature above PTC
increases abnormally, the PTC and the fanwill be
turned off; red LED1 lampflashes rapidly. When the
temperature lowers tonormal, the machine returns
to work.
THE DELAYED PROTECTION FOR COMPRESSOR
When the poweris on for the first time, the
compressor starts withoutwaiting for 3 minutes;
re-starting the machineafter the compressor is
stopped needs towait for 3 minutes.
3.2.5.5 CURRENT PROTECTION FOR COMPRESSOR
During operation, ifover-current lasts for 3 seconds,
the compressor willbe shut down instantly and the
green LED1 flashes.After 3 minutes, the compressor
will re-start.
3.2.6 OTHER FUNCTIONS
3.2.6.1 FANSTARTING
When the fanworks at medium, low, or super low
speed, there mustbe 3-second high speed starting.
3.2.6.2 THE INITIAL VALUES WHEN THE POWER IS ON
When the poweris on, the starting status are:
MODE: FAN
FAN: HIGH
CLOCK: 12:00
There are no other displays
3.2.6.3 BUZZER
When the machinestarts up, the buzzer sounds
twice. Press anykey, the buzzer soundsonce. When
there is waterlevel alarm, the buzzer sounds 8 times.
3.2.5.4
3.3 TROUBLE SHOOTING GUIDE
ROOM AIR CONDITIONER VOLTAGE LIMITS
NAME PLATE RATING MINIMUM MAXIMUM
115V 60Hz 98V 132V
8
Abnormal noise
Does this happenin
FAN ONLY mode?
Does this happen
without Auto Swing?
Yes Check vertical
louver
Yes
No
Check swing
motor
Replace main
board
Check whether the
unit is ona flat, level
ground.
Remove the outdoor
discharging pipe.
Does it stillhappen?
Check the pipe,the
tie-in, the dis-
charger.
Yes
Check motor
capacitor
Check fan
wheel
Check fan
motor
Replace main
board
Check air in-letand
out-let both inside
and outside
Check whether some
foam or otherthing
is broken intofan in
the unit.
Check loosen part No
Check loosen part
Check whether
there is collision
happened on pipes.
Check compressor
capacitor.
Check water depth
controller switch.
Is the noisecoming
from inner pipe?
Check whether pipes
are collided flat.
Yes
Replace main
board
Replace
compressor
No
It is notfaulty as the
refrigerant is flowing
in the pipe.

9
No cooling
No operation
Is there indicatoron
LCD?
Check power supply
and power cord
No Check
transformer
Replace
display board
Replace main
board
Check wiring
Check room
temperature setting
Is the Water Full
lamp flashing?
Yes
Can the fanmotor
operate?
Check wiring.
Yes
Check water
tank
Check water
depth controller
switch
Replace
display board
Replace main
board
No
No
Check fan motor
capacitor.
Is the voltageof
CN11 on main board
correct?
Replace main
board.
Yes
No
Replace fan
motor.
Yes
Check Whether the
evaporator or
condenser is
blocked.
Check compressor
capacitor.
Check temperature
sensor.
Is the voltageof
RL4 on mainboard
correct?
Replace compressor
Yes
No
Replace main board
No heating
Is there indicatoron
LCD?
No
Can the fanmotor
operate?
Check wiring.
Yes
No
Check over temp
protector on heater.
Is the voltageof
RL2 and RL3on
main board correct?
Replace main
board.
Yes
No
Replace heater
Yes
Check compressor
over-current
protector

10
Inefficient
cooling
Check wiring
Check room heat
load and windows
Check Whether the
evaporator or
condenser is
blocked.
Check compressor
and motor capacitor.
Check temperature
sensor.
Is the voltageof
RL4 and CN11 on
main board correct?
Check fan speed
Yes
No
Replace main board
Check air filter
Is temperature of
suction pipe on
compressor higher
o
than 19 C?
No
Replace compressor
Check leakage,
repair and recharge
refrigerant
Yes
Check room heat
load
Check the pipe,the
tie-in, the dis-
charger.
Water seep from
unit
Check water tank
Check water stopper
Check heat-
insulation foam inner
the unit.
Check water depth
controller switch Replace main board
Check water pipe
in the unit.

PROBLEM POSSIBLE CAUSE REMEDY
No power Check voltage at electrical outlet. Correct if none.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on transformer.
Replace the transformer if either of the input/output is open or the
transformer is damaged.
Battery failure Check the voltage of battery. Replace batteries if the voltage is lower
than 2.3V.
No power Check voltage at electrical outlet. Correct if none.
Power supply cord Check voltage at the power cord termianl on Main board. Replace the
power cord if none.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on transformer.
Replace the transformer if either of the input/output is open or the
transformer is damaged.
Wire disconnected or connection
loose
Connect wire. Refer to wiring diagram for termianl identification. Repair
or replace losse terminal.
Main board failure Select fan speed and Check the voltage of CN11 on main board. Replace
the main board if no voltage.
Capacitor (Discharge capacitor
before testing)
Test capacitor.
Replace if not within +/-10% of manufacture's rating. Replace if shorted,
open or damaged.
Will not rotate Fan blower hitting scroll. Realign assembly. Check
fan motor bearings. Replace the motor if motor shaft don't rotate.
Check voltage. Call an electrician if not within limits.
Test capacitor.
Replace if not within +/-10% of manufacture's rating.
Check bearings. Replace the motor if the fan blade cannot rotate freely.
Pay attention to any change from high speed to low speed. Replace the
motor if the speed does not change.
Fans Replace the fans if cracked, out of balance, or partially missing.
Loose screws Tighten them.
Worn bearings Replace the motor if knocking sounds continue when running or loose,
or the motor hums or noise appears to be internal while running.
Copper tubing Remove the cabinet and carefully rearrange tubing not to contact
cabinet, compressor, etc.
Discharging pipe Check outdoor wind discharging pipe, the tie-in, the air discharger.
Correct if any problem. Replace if damaged.
Parts loosen Tighten them.
Compressor Replace after checked failure.
The ground is not level or not flat
enough Place the unit on a flat, level ground.
Voltage Check voltage. Call an electrician if not within limits.
Wiring
Check the wire connections, if loose, repair or replace the terminal. If
wires are off, refer to wiring diagram for identification, and replace.
Check wire locations. If not per wiring diagram, correct.
Main board failure Check voltage RL4 of main board. Replace the main board if open.
Capacitor (Discharge capacitor
before testing)
Check the capacitor.
Replace if not within +/-10% of manufacturers rating. Replace if shorted,
open, or damaged.
Room temp sensor Check the temperature setting if not at the coolest (in cooling mode) or
the heatest (in heating mode). Set it if not.
Pipe temp sensor Check whether the evaporator is blocked. Check the pipe temp sensor
and replace if open circuit.
Water depth controller switch Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Over-current protector Replace after checked failure.
Compressor Check the compressor for open circuit or ground. If open or grounded,
replace the compressor.
PROBLEM SOLVING
Check the voltage of CN7 on main board. Replace the display board after
checked faulty else replace the main board.
Fan motor will not run.
Remote control failure.
Display board or main PCB failure
No display on panel or
any one of the button
failure.
11
Revolves on overload.
Fan motor runs
intermittently
Fan motor noise.
Compressor will not run
while fan motor runs.
Excessive noise.

PROBLEM POSSIBLE CAUSE REMEDY
Air filter Clean or replace if restricted.
Discharging pipe Check outdoor wind discharging pipe, the tie-in, the air discharger.
Correct if any problem. Replace if damaged.
Unit undersized Determine if the unit is properly sized for the area to be cooled or
heated.
Condenser and Evaporator Clean or replace if restricted.
Fan motor Check the fan capacitor and replace if not within +/-10% of
manufactures rating.
Room structure and window kits
installation
Take proper measures or re-installate the windows kits to make the door
and windows sealed well if gap is found.
Air flow Clean or remove if any barrier is found to block the inlet/outlet wind flow
of the unit.
Less refrigerant Check the tubes for reasons of leakage. Recycle the refrigerant, correct
the leakage points and recharge.
Capillary tube Regulate the flow if capillary tube and make the evaporating temerature
appropriate if the evaporator is frosted.
Compressor
The inlet and outlet valve of the compressor is damaged, making the low
pressure connected with the high pressure. The refrigerating system is
difficult to produce high pressure and low pressure. Replace the
compressor after checking for the reason.
Heat sources Reduce if too many.
Electric heater Check the two over temp protectors. Replace if damaged. Replace after
the heater is checked faulty.
Refrigerant
The amount of the refrigerant is too much, making the compressor load
too big. Recycle and recharge the refrigerant after checking for the
reason.
Over-current protector Replace after checked failure.
Compressor The compressor is seized. Replace after checking for the reason.
Room temprature sensor Check and replace if the temprature is open or damaged.
Water depth controller switch Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Main board Check and replace the main board after checked failure.
Power supply The input power supply voltage is too low. Call an electrician if not within
limits.
Main board Check and replace the main board if the RL4 relay on main board is
shorted or damaged.
No power Check the voltage. Call an electrician if no within the limit.
Wiring Check the termianls. Repair and correct if loose.
Temperature setting Check and adjust the temperature setting.
Mode setting Check and adjust the mode setting.
Over-current protector Replace after checked failure.
Capacitor (Discharge capacitor
before testing)
Check the capacitor.
Replace if shorted, open, or damaged.
Compressor The compressor is damaged. Replace after checking for the reason.
Water depth controller switch Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Main board Check the voltage of RL2 and RL3 on main board. Replace the main
board when the unit failure in heating mode.
Electric heater Check the two over temp protectors. Replace if damaged. Replace after
the heater is checked faulty.
LCD is not clear LCD malfunction Replace LCD.
Transformer failure Check output voltage of transformer and replace after check faiulure.
Swing motor Replace after checked failure.
Wiring Correct according to wiring diagram.
Main board Check the voltage of P1 on main board. Replace the main board after
checked failure.
Vertical louver is blocked Clean and repair after checked faulty.
PROBLEM SOLVING
12
No cooling or heating.
Insufficient cooling or
heating.
Stop instantly after
startup.
The compressor not to
stop even the room
temperature has got to
the setting temperature
or the water tank is full.
The unit starts and stops
frequently.
No auto swing

13
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM
For Model MPA-08CE and MPA-08CR
For Model MPA-08EE and MPA-08ER