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MXZ Type
LED indication
for communication status
Communication status is indicated by the LED.
Unit status
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
10 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
Outdoor control P.C. board
LED1 LED2 LED3
Blinking
Pattern
LED 1
LED 2
Unit A
Unit B
1
status
status
Unit C
Unit D
2
status
status
Unit E
3
status
OBH849G
Turn OFF the power supply.
Is there rated voltage in
the power supply?
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION
INDICATOR lamp on the indoor unit light up?
LED 3
<Confirmation of the power to the indoor unit>
Lit
Not lit
Is serial signal error indicated 6 minutes later?
Blinking
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and
then turn ON again.
· Press EMERGENCY OPERATION
switch.
Is serial signal error
indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Bridge the outdoor terminal block S2 and
S3. *1
Turn ON the power supply.
Does the LED on the outdoor control P.C.
board repeat "3.6-second-OFF
and 0.8-second-ON quick blinking"?
Turn OFF the power supply.
Remove the bridge between outdoor
terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 V 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.
Be sure to release the failure-mode
recall function after checking.
Check the power supply.
No
Yes
Check the wiring.
No
Yes
No
Yes
Is there any miswiring,
poor contact, or wire
disconnection of the
No
indoor/outdoor
connecting wire?
Yes
· Reinstall either the unit or the light away
from each other.
· Attach a filter on remote control receiving
No
section of the indoor unit.
Yes
*1 Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
No
(Lit
or not lit)
Yes
No
Yes
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
No
intermediate connection, poor
contact to the terminal block?
Yes
33
Correct them.
Yes
No
Replace the outdoor control P.C. board.
*2
*2 Be careful of the residual
voltage of smoothing capacitor.
Replace the
indoor/outdoor
Yes
connecting wire.
No
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