Hitachi YUTAKI Series - 10.1.2 General Maintenance Procedure for the Indoor Unit

185
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
 


• ThealarmcodeisdisplayedonthePCB´sdisplay.
– This alarm code is displayed when the communication between Main PCB (PCB1) and Inverter (DIP- IPM/ISPM) is
not performed correctly during 30 seconds.

Is wiring between CN8 of
thePCB1andCN2,6onthe
Inverter PCB (DIP-IPM/ISPM)
correctlyconnected?
Wiring check and Repair
(Breakingofwire,wrongwiring)
No
Yes
Checkthewiringagain,
PCB1,InverterPCB(DIP-
IPM/ISPM) are normal.
Power Supply ON after
disconnecting CN8 on PCB1
Is LED 7 (Green) on PCB1
ashing?
No
Yes
Reconnect CN8 on PCB1
No
Failure of Inverter PCB (DIP-IPM/ISPM)
Disconnecting of the wiring between inverter
PCB (DIP-IPM/ISPM) and PCB1
DoesLED7(Green)ashing
speed become faster than
before?
No
Failure of Inverter PCB (DIP-IPM/ISPM)
Failure of the DC Fan Motor
Yes
Yes
Failure of transmission circuit
on PCB1
Is LED 7 (Green) on PCB1
ashing?
Disconnectingorinsufcientcontactofthe
wiring between Inverter PCB(DIP-IPM/ISPM)
and PCB1