Toyotomi CCT 50HINVi Service Manual page 53

Troubleshooting
2.4.4.2. E2 malfunction
E2 display
Indoor / outdoor units communication error
Power off, then turn on the unit 5
seconds later(reconnect the power
wire).Is the error still displaying
after several minutes?
Yes
Check whether there's any
interference.
Such as too many lamps, power
transformers? Or the signal wire
is too long?
No
Check whether the signal wire
is shield cable or whether the
shield cable is earthing?
Yes
Check whether the wire is
correct polarity? P to P, Q to Q,
E to E?
Yes
Check whether the signal wire
is broken?
No
Check whether the signal wires
insert on PCB well?
Yes
Replace indoor PCB, is the error
distinguished?
No
Replace the outdoor PCB.
116
Remove interference.
Yes Increase the capacity of anti-
interference
Adopt shield cable/Shield
No
cable earthing.
No
Correct the connection.
Yes Replace the signal wire.
No
Pull out and insert back.
Electrical Control System