Hitachi RAS-8.0HNBRMQ1 - Page 113

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(2) Control Part of Outdoor Unit PCB
The position of LEDs, connectors on O.U.PCB are as follow
Item Part Name
LED LED1, LED2, LED***
Connector PCN***, CN***
Fuse FU1, FU2
Check Point 5V, 12V, GND
●
Checking Item for Fuse
The purpose, capacity, and causes of fuse melted are shown as below.
Fuse Capacity Purpose
FU1
40A (3~3.5HP)
Protection for short circuiting of control circuit(220/230/240V)
50A (4~6.5HP)
FU2 3.15A
FU4 5A
FU1
FU2
LED1
5V
GND
12VD
FU2
FU4
TROUBLESHOOTING