13-1
TROUBLESHOOTING
SM YBD018 1-A.1 GB
13. TROUBLESHOOTING
13.1
ELECTRICAL & CONTROL TROUBLESHOOTING
WARNING!!!
When Power Up – the whole outdoor unit controller, including the wiring, is under HIGH
VOLTAGE!!!
Never open the Outdoor unit before turning off the Power!!!
When turned off, the system is still charged (400V)!!!
It takes about 4 Min. to discharge the system.
Touching the controller before discharging may cause an electrical shock!!!
For safe handling of the controller please refer to section 13.3 below.
13.1.1
Single Split system failures and corrective actions
No
SYMPTOM
PROBABLE
CAUSE
CORRECTIVE ACTION
1
Power supply indicator
(Red LED) does not light
up.
No power supply
Check power supply. If power supply is OK,
check display and display wiring. if OK,
replace controller.
2
Unit does not respond to
remote control message
Remote control
message not
reached the indoor
unit
Check remote control batteries, if batteries
are OK, check display and display wiring, if
OK, replace display PCB.
If still not OK replace controller.
3
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 controller.
4
Indoor fan does not start
(louvers are opened and
Green LED does light up)
Unit in heat mode
and coil is still not
warm.
Change to cool mode and check.
Problem with PCB
or capacitor
Change to high speed and Check power
supply to motor is higher than 130VAC
(for triack controlled motor) or higher
than 220VAC for fixed speed motors, if
OK replace capacitor, if not OK replace
controller
5
Indoor fan works when
unit is OFF, and indoor
fan speed is not changed
by remote control
command.
PCB problem
Replace controller
6
Compressor does not
start
Electronics
control problem or
protection
Perform diagnostics (See 13.1.3 below),
and follow the actions described.
7
Compressor stops during
operation and Green
LED remains on
Electronic control
or power supply
problem
Perform diagnostics (See 13.1.3 below),
and follow the actions described.
8
Compressor is on but
outdoor fan does not
work
Problem with
outdoor electronics
or outdoor fan
Check outdoor fan motor according to the
procedure in section 13.2.3 below, if not
OK replace controller
