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Troubleshooting
1. Troubleshooting
1.1 Initial Troubleshooting
1.1.1 Checking of Electrical Wiring and Power Supply
Check the following items if there is abnormality to the activation of air conditioner.
No. Check Item Check Method
1 Is power supply breaker or fuse blown out?
Check the voltage (secondary side) of the breaker and also check the
conductivity of fuse by a tester.
2 Is voltage at secondary side of transformer correct?
Disconnect connection at the secondary side of the transformer and
measure voltage by a tester.
3 Is wiring rmly xed or correctly connected?
“Check that the following wiring connections on O.U./I.U. PCBs are not
loosened.
• The connections for thermistors
• The connections for the remote control switch cable
• The connections for transformer
• Each connection for power line
Check that the wiring connections on O.U./I.U. PCBs are not loosened
or mis-connected on the site according to “Electrical Wiring Diagram” in
Design Chapter.”
Refer to installation manual for details.
1.1.2 Checking of Rotary Switch and Dip Switch Setting
TURN OFF all the power supplies before setting.
Without turning OFF, the switches do not work and the contents of the setting are invalid. However, DSW4-No.1,2, 4 can be
operated during power supply is ON. The mark of “ ■ ” indicates the position of dip switches.
NOTE
● By using switch DSW4, the unit is started or stopped after 10 to 20 seconds after the
switch is operated.
● Number this outdoor unit to distinguish from other outdoor units for service and
maintenance. And write the number in the space right.
Inverter PCB and Fan Controller
NOTE: 1)This setting is only eective for single-compressor and double-fan system.
2)This setting is only eective for double-compressor and double-fan system.
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