Troubleshooting Guide

Air Conditioner Service Manual
39
3.3 Trouble shooting
3.3.1 E0 ---IDU & ODU communication failure
Start
Display E0
IDU wiring
connection correct ?
Check communication
wiring and the connection,
in good condition?
ODU wiring
Connection correct?
Yes
OK
Check and re-
connect
No
Main power supply
from IDU?
Yes
No
Replace/ re-
connect
Check and re-
connect
No
n
Check voltage from IDU
terminal btw L,N. is there
220V?
Replace IDU PCB
No
Yes
OK
Yes
Is the ODU PCB
LED5 ON?
Replace ODU PCB
Check voltage from IDU
terminal btw L,N. is there
220V?
Check the power
supply connection
Replace or
reconnect
Yes
Is the ODU PCB
LED5 ON?
Yes
Replace ODU PCB
No
No
No
End
ON constantly
Flash
Flash or not?
No
Yes
Yes
E0 disappear?
Yes
OK
No
E0 disappear?
No
Yes
OK
E0 disappear?
No
No
Yes
OK
E0 disappear?
Yes
No
First replace
IDU PCB
E0 disappear?
Yes
No
First replace IDU
PCB
E0 disappear?
Yes
Replace ODU PCB
E0 disappear?
Yes
No
No
Yes
Replace ODU PCB
E0 disappear?
Yes
No
Yes