30
MXZ Type
Outdoor control P.C. board
Blinking
LED1 LED2 LED3
LED 1
LED 3
LED 2
Pattern
1
2
3
Unit B
status
Unit C
status
Unit A
status
Unit D
status
Unit E
status
Not lit
Lit
Blinking
Yes
Yes
• Reinstall either the unit or the light away
from each other.
•
Attach a filter on remote control receiving
section of the indoor unit.
No
No
No
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
No
Turn ON the power supply.
Check the power supply.
Is there rated voltage between outdoor terminal
block S1 and S2?
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION INDICA-
TOR lamp on the indoor unit light up?
<Confirmation of the power to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes
later?
Is serial signal error indicated 6 minutes
later?
Yes
No
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connect-
ing wire?
Yes
Yes
Correct them.
No
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press EMERGENCY OPERATION switch.
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.
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>
Yes
Replace the inverter P.C. board.
*
2
Yes
Does the LED on the outdoor control P.C. board repeat
“3.6-second-OFF and 0.8-second-ON quick blinking”?
Yes
Replace the Indoor electronic control P.C. board.
Replace the
indoor/outdoor
connecting wire.
*
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.
*
2. Be careful of the residual voltage of smoothing
capacitor.
Is there rated voltage between outdoor terminal
block S1 and S2?
<Confirmation of power voltage>
No
No
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?
Be sure to release the failure-mode recall function after checking.
LED indication for communication status
Communication status is indicated by the LED.
Unit status
Blinking: Normal communication
Lit:
Abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
10 seconds.
NOTE:
"Lit" in the table below does not
indicate abnormal communication.
<HR25/35/42/50VF>
OBH822B
