Daewoo DSB-181LH Service Manual - 8. Trouble Shooting

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8. TROUBLE SHOOTING

Outdoor unit does

not run?(note. 1)

Does

the compressor run

normally?

Indoor unit does

not run(note 1)

Check the failure

code according to

the self diagnostic

(note  2)

Is the unit 

display

mormal?

check the failure 

code according to

the self-diagonostic

(note 2)

Normal

check the 

connecting

point of

magnetic

contactor

YES

YES

YES

YES

NO

NO

YES

Trouble

Is the power

applied to the

unit

Is the 

power normal?

check the voltage between

L & N of terminal

block

press the power ON/OFF 

button on remote controller

Does the 

beeper beep two

times?

Is the display

all off?

• Check the connector on display

PCB connected to control PCB

• Check the display PCB itself

Check power supply mains

or interconnection wires

Check the wiring of indoor

Is the 

switch position 

on switch pannel 

at 

"Remote"

Does 

control PCB 

status LED repeat one 

second "on and 

off"?

• control PCB fault

• Micom or reset 

IC fault

• Check the remote signal receiver

• Check the connection between signal

receiver and control PCB

   Place the switch

position to the

"Remote" and then

Check it once 

more

YES

NO

YES

NO

NO

NO

NO

YES

YES

YES

YES

YES

NO

NO

NO

Is the

unit display

normal?