Hitachi RAS-5HVRNM1E Service Manual page 230

8 Troubleshooting
RAS-(8/10)HRNSE
RAS-(4–10)H(V)RNS(1)(E)
Phenomenon
Disconnected wires, insufficient
contacting or incorrect connection
Faulty PCB (PCB1 for the control,
PCB2 for the inverter)
Incorrect wiring
222
SMGB0060 rev. 1- 12/2010
Cause
Between control PCB, inverter
PCB2
Power source wiring for the outdoor
unit
Disconnected wires to PCB
Faulty PCB
Disconnected wires;
insufficient contacting
Incorrect wiring
Check item
Check the continuity of wires.
Check for looseness of the
connection screws. Check the
connection No.
Check the connections
-
Check the continuity.
Check for looseness of connection
screws
Check the connection Nos.
Action
(Turn OFF the main switch)
Replacing wires, repairing,
tightening screws and incorrect
wiring
Repair the wiring connections
Replace PCB if faulty
Replacing wires, repairing,
tightening screws
Correctly connect the wires