Service manual

24
How to check mis-wiring and serial signal error
D
Is there rated voltage
in the power supply?
Is there any mis-wiring, 
poor contact, or wire 
disconnection of the 
indoor/outdoor 
connecting wire?
W1.Mis-wiring may damage indoor electronic control
 P.C. board during the operation.
 Be sure to confirm the wiring is correct before the
 operation starts.
W3.Be sure to check this within 3 minutes after turning 
 ON. After 3 minutes, LED blinks 6 times. Even when 
 the inverter P.C.board or the outdoor electronic control 
 P.C.board is normal, LED blinks 6 times after 
3 minutes.
 (Except for outdoor unit of multi system type)
(Lighted or
not lighted)
No
Yes
No
Yes
Yes
No
Yes
No
Yes
W2 Be careful to the residual
voltage of smoothing capacitor.
Be sure to release the failure-mode
recall function after checking.
No
No
Yes
No
Yes
Yes
Yes
No
Yes
Refer to outdoor unit service manual.
Turn OFF the power supply.
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Does POWER lamp light up? 
<Confirmation of the power to the indoor unit>
Press EMERGENCY OPERATION switch once.
Check the power
supply.
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not mis-wiring.
Short-circuit outdoor terminal block S2 and
S3.
W1
B
Turn ON the power supply.
Check the wiring.
Make them correct.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there rated voltage between indoor
terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor electronic control P.C. board.
Replace the inverter P.C. board or 
the outdoor electronic control P.C.board.
W2
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Replace the
indoor/outdoor
connecting wire.
Replace the
indoor/outdoor
connecting wire.
Is serial signal
error indicated
6 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press EMERGENCY OPERATION
switch.
B
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on remote
control
receiving
section of
the indoor
unit.
A
Is serial signal error indicated 6 minutes later?
No
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-second-ON
quick blinking"?
W3
• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• When POWER lamp flashes ON and OFF in every 0.5-second.
Outdoor unit does not operate.
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