Service manual

12-1
TROUBLESHOOTING
SM HADDCI 1-A.2 GB
12. TROUBLESHOOTING [HAD007, HAD009, HAD012]
12.1 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 15.1.6 below.
12.1.1 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 15.1.3 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 15.1.3 below),
and follow the actions described.
CONTENTS