28
D How to check miswiring and serial signal error
NOTE:
Refer to the outdoor unit service manual.
HR25/35/42/50VF
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
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 OPERATION INDICATOR lamp 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 Correct them.
No
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
*
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the opera
-
tion starts.
Turn ON the power supply.
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-sec-
ond-ON quick blinking"?
*
3
Yes
No
(Lit or not
lit)
Replace the inverter P.C. board.
*
2
*
2. Be careful of the residual voltage of smoothing
capacitor.
Turn OFF the power supply.
Remove the bridge between outdoor terminal block S2 and S3.
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Yes
*
3. 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)
Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND
VOLTAGE" in the outdoor service manual.)
No
Yes
Replace the indoor electronic control P.C. board.
OBH822B
