Mitsubishi Electric Mr. Slim MSZ-FE09NA Service Manual page 31

D How to check miswiring and serial signal error
Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer
to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)
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"? 3
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
• Reinstall
either the unit
or the light
away from
each other.
Is serial signal
• Attach a fi lter
error indicated 6
No
on remote
minutes later?
control receiv-
Yes
ing section
of the indoor
unit.
B
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confi rmation of the power to the indoor
unit>
Yes
Is serial signal error indicated 6 minutes
later?
Yes
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
Turn ON the power supply.
Yes
Yes
Replace the indoor electronic control P.C. board.
Check the power supply.
No
No
Is there any miswiring,
poor contact, or wire
disconnection of the
No
indoor/outdoor connect-
ing wire?
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confi rm the wiring is correct before the opera-
tion starts.
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)
Replace the inverter P.C. board or the outdoor
electronic control P.C. board. 2
No
(Lighted
2. Be careful of the residual voltage of smoothing
or not
lighted)
31
No
Check the wiring.
Correct them.
Yes
No
No
capacitor.