32
How to check miswiring and serial signal error
D
When the left lamp of OPERATION INDICATOR lamp blinks ON and OFF in every 0.5-second.
Outdoor unit does not operate.
Turn OFF the power supply.
Check once again if the indoor/outdoor
connecting wire is not wrongly connected.
Short-circuit the outdoor terminal block S2
and S3.
*1
Is there rated voltage of
208/230 V AC in the power
supply?
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor
connecting wire?
*1. Miswiring may damage indoor electronic control
P.C. board during operation.
Be sure to confirm the wiring is correct before the
operation starts.
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
As for outdoor unit, refer to outdoor unit service manual.
Turn OFF the power supply.
Turn ON the power supply.
Is there 208/230 V AC between
outdoor terminal block S1 and
S2?
Does the left lamp of OPERATION INDICATOR
lamp light up? <Confirmation of the power
supply to the indoor unit>
Press the emergency operation switch once.
Check the power
supply.
Is the serial signal error indicated 6 minutes later?
Check the wiring.
Correct them.
Is the serial
signal error
indicated 6
minutes later?
Yes
No
· Turn OFF inverter-controlled lighting equipment.
· Turn OFF the power supply and then turn it ON again.
· Press the emergency operation switch.
· Reinstall either the unit or the light away
from each other.
· Attach a filter on receiving section of the indoor unit.
OBH802B
