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25

AY-AP18DR

7

~

42˚C

ON

-2

~

45˚C

ON

~

7˚C , 42˚C

~

OFF

~

-2˚C , 45˚C

~

OFF

0.3V

~

4.5V

ON

~

0.3V , 4.5V

~

ON

0.3V

~

4.5V

ON

~

0.3V , 4.5V

~

ON

~

0.3V , 4.5V

~

OFF

0.3V

~

4.5V

OFF

~

0.3V , 4.5V

~

OFF

0.3V

~

4.5V

OFF

AH-AP18DR

7

~

42˚C

ON

-2

~

45˚C

ON

~

7˚C , 42˚C

~

OFF

~

-2˚C , 45˚C

~

OFF

0.3V

~

4.5V

ON

~

0.3V , 4.5V

~

ON

0.3V

~

4.5V

ON

~

0.3V , 4.5V

~

ON

~

0.3V , 4.5V

~

OFF

0.3V

~

4.5V

OFF

~

0.3V , 4.5V

~

OFF

0.3V

~

4.5V

OFF

OFF

ON

ON

OFF

OFF

OFF

OFF

BLUE

Out Fan(JP18)

TEST(JP8)

Cluster(JP19)

Dry Fan(JP11)

31

Sweat(JP3)

Hot Keep(JP2)

OPEN

21

Power On Start(JP5)

Wireless(JP4)

MODEL SELECTION(AN4 input voltage)

GREEN

ON

ON

OFF

ON

OFF

ON

1000

rpm

OFF

ON

OFF

ON

OFF

OFF

CT INPUT(AN2 input voltage)

BLUE

ON

OFF

11

FEED BACK CIRCUIT

AN3(        )

1

FLICK

OFF

OFF

OFF

OPEN

OFF

OFF

OFF

ON

ON

ON

ON

Compressor

02

Room temp.

Pipe temp.

Indoor

Fan

Louver

FAN HIGH

FAN AUTO

CLUSTER

Outdoor

fan

4-way

valve

Power

STEP

No

Buzzer

Lamps

Cluster

Selector

RED

YELLOW

FAN SOFT

FAN LOW

OFF

41

DEICE 1

DEICE 2

Louver Collection(AN5 input voltage)

OFF

OFF

OFF

OFF

OFF

OFF

OFF

51

Pipe 1

Pipe 2

Cooling mode FAN speed Collection(AN6 input voltage)

OFF

OFF

OFF

ON

OFF

OFF

OFF

61

EEPROM

Micro SW

Heating mode FAN speed Collection(AN6 input voltage)

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

71

OFF

OFF

EEPROM VERSION(UPPER 4bit)

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

OFF

OFF

81

OFF

OFF

CLOSE

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

EEPROM VERSION(LOWER 4bit)

STEP

No

Buzzer

Lam

p

s

Cluster

Outdoor

Indoor

Fan

Louver

RED

YELLOW

FAN SOFT

FAN LOW

FAN HIGH

FAN AUTO

CLUSTER

Power

Selector

02

Room temp.

Pipe temp.

ON

ON

ON

ON

BLUE

OFF

OFF

OFF

OFF

OPEN

11

FEED BACK CIRCUIT

CT INPUT(AN2 input voltage)

BLUE

ON

OFF

ON

1000

rpm

OFF

OFF

OFF

OPEN

FLICK

21

Power On Start(JP5)

Wireless(JP4)

MODEL SELECTION(AN4 input voltage)

GREEN

ON

ON

OFF

31

Sweat(JP3)

Hot Keep(JP2)

Out Fan(JP18)

TEST(JP8)

Cluster(JP19)

Dry Fan(JP11)

OFF

OFF

OFF

OFF

41

DEICE 1

DEICE 2

Louver Collection(AN5 input voltage)

OFF

OFF

OFF

OFF

51

Pipe 1

Pipe 2

Cooling mode FAN speed Collection(AN6 input voltage)

OFF

OFF

OFF

OFF

OFF

61

EEPROM

Micro SW

Heating mode FAN speed Collection(AN6 input voltage)

OFF

OFF

OFF

OFF

OFF

ON

71

OFF

OFF

EEPROM VERSION(UPPER 4bit)

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

81

OFF

OFF

CLOSE

OFF

OFF

OFF

OFF

OFF

OFF

EEPROM VERSION(LOWER 4bit)

0.1V

~

4.9V

ON

-0.1V , 4.9V

~

OFF

OFF

ON

OFF

OFF

ON

ON

ON

OFF

ON

ON

ON

ON

ON

OFF

ON

OFF

ON

ON

ON

ON

OFF

ON

ON

ON

ON

ON

ON

OFF

ON

ON

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

OFF

ON

OFF

OFF

ON

ON

OFF

OFF

OFF

ON

ON

OFF

ON

OFF

ON

ON

OFF

OFF

ON

ON

ON

ON

AN3(      1)

0.1V

~

4.9V

ON

-0.1V , 4.9V

~

OFF

26

Diagnosis procedure
When indoor fan motor is out of order or compressor lock occurs, the compressor, indoor fan motor, outdoor
fan motor, and louver are all stopped and the operation LED(red) turns on or off synchronously with the timimg
of the timer LED.
When the thermistor for room temperature or pipe temperature is open or short state, the operation LED turns
on or off synchronously with the timing of the timer LED by pushing continously for more than 5 seconds
"AUX." button during suspension of operation.

Timing chart of Timer LED and Operation LED of DIAGNOSIS PROCEDURE.
When "OI" button the remote controller or "AUX." button in the unit is pushed, the unit is free from
DIAGNOSIS PROCEDURE.

When the louver unit is not properly installed, all lamps on the indicator panel will blink, operation are all stop
and Remote signal is not accept.

Indoor 
fan motor

Comp.-lock

Thermistor 
short state

Thermistor 
open state

Timer 
LED

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Operation 
LED

Operation 
LED

Operation 
LED

Operation 
LED

1sec.

1sec.

4sec.

27

measure the secondary voltage
of transformer.

YES

NO

YES

NO

The machine does not function
at all with remote controller and
switch on the indoor unit. 

Using a tester, measure the 
voltage between anodes of D1 
and D2 on PWB ass'y.

Is the measured value 

approx. 17.5 Vac ?

Replace the PWB with a new 
one.

Is the WPE1

open  circuit ?

Replace the fuse and varistor 
with new ones.

Replace the transformer with
a new one.

OK

FAIL

Check  the  cleaning

switch  2(1), CN9, CN8

and lead  wires.

Replace the cleaning switch  2(1).
(or  reset  connector)

28

YES

NO

NO

YES

The machine does not function
with remote controller 

Push button "O/I" on the 
wireless remote controller.

Is transmitting

indicator of the remote 

controller active ?

Is indicator lamp of

indoor unit proper ?

Replace the 
PWB  with a 
new one.

Does beep sound

from the indoor unit ?

Using a tester,
measure the voltage
between terminals
of resistor R26
on the PWB ass'y.

Push the button "O/I".

Are batteries of the

wireless remote controller 

proper ?

Replace the batteries 
with new ones.

Replace the wireless
remote controller.

When the signal is

received, does the voltage

change ?

Replace the PWB with a new 
one.

PWB is normal.
Inspect the outdoor unit.

NO

YES

NO

YES

Replace the photo 
detector unit with a new 
one.

NO

YES