Troubleshooting - Airwell SX 9 DCI Service Manual

11.

TROUBLESHOOTING

When Power Up – the whole outdoor unit controller, including the wiring, is under
Never open the Outdoor unit before turning off the Power!!!
Touching the controller before discharging may cause an electrical shock!!!
For safe handling of the controller please refer to section 11.6 below.
11.1 General DCI Single Split System failures and Corrective Actions
No SYMPTOM
Power supply indicator (Red
1
LED) does not light up.
Unit does not respond to
2
remote control message
Unit responds
control message but Operate
3
indicator (Green LED) does
not light up
Indoor fan does not start
4 (louvers are opened and
Green LED does light up)
Indoor fan works when unit
is OFF, and indoor fan speed
5
is not changed by remote
control command.
6 Compressor does not start
Compressor stops during
7 operation and Green LED
remains on
SM SX DCI 1-A.3 GB
WARNING!!!
HIGH VOLTAGE!!!
When turned off, the system is still charged (400V)!!!
It takes about 3 Min. to discharge the system.
PROBABLE
No power supply
Remote
message not reached
the indoor unit
to remote
Problem with display
PCB
Unit in heat mode and
coil is still not warm.
Problem with PCB or
capacitor
PCB problem
Electronics control
problem or protection
Electronic control
or power supply
problem
CONTENT
CORRECTIVE ACTION
CAUSE
Check power supply. If power supply
is OK, check display and display
wiring. if OK, replace controller.
Check remote control batteries, if
control batteries are OK, check display and
display wiring, if OK, replace display
PCB.
If still not OK replace controller.
Replace display PCB.
If still not OK replace controller.
Change to cool mode and check.
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
Replace controller
Perform diagnostics (See 11.3), and
follow the actions described.
Perform diagnostics (See 11.3), and
follow the actions described.
TROUBLESHOOTING
11-1