Hitachi FSXN Series Service Manual page 350

12 Maintenance notes
12.1 Checking the power source and the wiring connection
Check the following items in the case of abnormal operation:
No. Check item
1 Is the breaker of the fuse cut out? Check the secondary voltage of the breaker and the fuse by means of a tester.
Is the secondary power source on
2
the transformer correct?
Is the wiring loosened or
3
incorrectly connected?
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SMGB0065 rev. 1 - 12/2010
Procedure
Disconect the secondary side of the transformer and check the voltage by
means of a tester.
Primary side
220V or 240V
Check the wiring connection on the PCB.
• Thermistor connectors
• Connector of the remote control cable
• Cobbector of the transformer
• Each connector in a high-voltage circuit
Check the connectors according to the electrical wiring diagram.
Indoor Unit
transformer
12V
Secondary
side
12V