Kaisai KCD-18HRFN1-QRC4, Service Manual

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Troubleshooting
140 Electrical Control System
2.4.4.2 . E2 malfunction
Indoor / outdoor units communication error
E2 display
No
Power off, then turn on the unit 5
seconds later(reconnect the power
wire).Is the error still displaying
after several minutes?
Adopt shield cable/Shield
cable earthing.
No
Yes
Correct the connection.
No
Yes
Remove interference.
Increase the capacity of anti-
interference
Yes
Yes
Replace the signal wire. Yes
Pull out and insert back. No
No
Replace indoor PCB, is the error
distinguished?
Yes
Replace the outdoor PCB.
No
Check whether there’s any
interference.
Such as too many lamps, power
transformers? Or the signal wire
is too long?
Check whether the signal wire
is shield cable or whether the
shield cable is earthing?
Check whether the wire is
correct polarity? P to P, Q to Q,
E to E?
Check whether the signal wire
is broken?
Check whether the signal wires
insert on PCB well?