Kaisai K2OC-18HFN32, Руководство по обслуживанию

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10.3.3.2 Communication malfunction between IPM board and outdoor main board(ODU E3)
E3 display
Is there at least one LED in
the IPM board light?
No
Check the signal wire between
the IPM board and the main
board, is it connected good?
Yes
No
Yes
Reconnect and retry. Is
error still display?
No
No
Replace IPM board, and
then check whether the
system can run normally
Yes
No
Replace outdoor main
board, and then check
whether the system can run
normally
Yes
No
Trouble is solved
Replace the electric control
box
Communication malfunction between
IPM board and outdoor main board