13-2
TROUBLESHOOTING
SM DLSDCI 3-A.1 GB
13.2 General System Failures and Corrective Actions
No.
SYMPTOM /
PROBLEM
PROBABLE
CAUSE
CORRECTIVE ACTION
Indoor unit
1.
Indoor unit power supply
indicator (Red LED)
does not light up.
No Power supply
Check supply voltage to main terminals L and N
with volt meter.
Miss-wiring
Check all supply wiring to controller and terminals
according to wiring diagram
Loose connection Check all power wiring connections
Display and
display cable
Check continuity of each wire of the display wires/
pins with Ohm meter
If still not OK Check if fuse burnt
2.
Fuse burned in indoor
unit controller
Short Circuit
between wires
Check for any cuts or exposed supply wires or
miss-wiring
Failure of Indoor
Unit Fan Motor
Check the motor and capacitor (
13.5.19)
Check for any cuts or exposed wires
If still not OK Replace fuse
3.
Indoor unit does not
respond to remote
control message
Remote control
message not
reached the
indoor unit
Check remote control batteries
Check continuity of each wire of the display wires/
pins with Ohm meter
If still not OK
Replace display box or indoor Electronic
Assembly
4.
Indoor unit responds to
remote control message
but Operate indicator
(Green LED) does not
light up
Problem with
display PCB
Replace display PCB.
If still not OK Replace indoor Electronic Assembly
5.
Indoor fan does not start
(louvers are opened and
Green LED is ON)
Unit in heat mode
and coil is still not
warm
Change to Cool or Fan mode
Failure of Indoor
Unit Fan Motor
Check the motor and capacitor (
13.5.19)
Check for any cuts or exposed wires
Problem with
controller or motor
capacitor
Change to high speed and Check power supply to
motor is higher than 220VAC
If still not OK Replace indoor Electronic Assembly
6.
Indoor fan works
when unit is OFF, and
indoor fan speed is not
changed by remote
control command.
Controller
problem
Replace indoor Electronic Assembly
7.
Water leakage from
indoor unit
Indoor unit
drainage tube is
blocked
Check and open drainage tube
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