Hitachi RAS-3HVRNS - Checking the Power Source and the Wiring Connection

12.1 Checking the power source and the wiring connection
Check the following items in the case of abnormal operation:
No.
Check item Procedure
1
Is the breaker of the fuse cut
out?
Check the secondary voltage of the breaker and the fuse by means of a tester.
2
Is the secondary power source
on the transformer correct?
Disconnect the secondary side of the transformer and check the voltage by means of a tester.
Indoor unit
transformer
Secondary
side
Primary side
220, 230 or
240 V
Circuit and voltage
12 V
12 V
3
Is the wiring loosened or
incorrectly connected?
Check the wiring connection on the PCB.
• Thermistor connectors
• Connector of the remote control cable
• Connector of the transformer
• Each connector in a high-voltage circuit
Check the connectors according to the electrical wiring diagram.
12 Maintenace notes
458
SMGB0060 rev. 1- 12/2010