Er1 E2 Et2 Er2 - Mitsubishi Electric MSZ-EF18VGW-E1 Service Manual

MXZ Type
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press the emergency operation switch.
Turn OFF the power supply.
Check once more if the indoor/outdoor connecting wire is not miswiring.
Remove the indoor/outdoor connecting wire from outdoor terminal block S3.
Bridge the outdoor terminal block S2 and S3. 1
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" of the outdoor unit.)
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 bridge between outdoor terminal block S2 and S3.
Connect the indoor/outdoor connecting wire to outdoor terminal block S3.
Turn ON the power supply.
Is there rated voltage between indoor terminal block S1 and S2?
<Confirmation of power voltage>
Is there amplitude of 10 to 20 V DC between indoor terminal block S2
and S3? <Confirmation of serial signal>
OBH831D
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 the emergency operation switch once.
Does the left lamp of OPERATION INDICATOR
lamp light up? <Confirmation of the power to
the indoor unit>
Yes
Is serial signal error indicated 6 minutes later?
Yes
Is serial signal error indicated 6 minutes later?
Yes
Turn ON the power supply.
Yes
Yes
Yes
Yes
Is there 2 V DC or less between CN102 (+)
and JPG/CN102 * (GND)(-) on the indoor
electronic control P.C. board?
Yes
Is there 2 V DC or less between
CN102 (+) and JPG/CN102 *
(GND)(-) on the indoor electronic
control P.C. board?
Replace the indoor power
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?
• Reinstall either the unit or the light away from each other.
• Attach a filter on remote control receiving section of the indoor unit.
No
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.
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)
Check the wiring.
If there are any error of the indoor/outdoor connecting wire:
such as the damage of the wire, intermediate connection,
No
and/or poor contact to the terminal block, replace the indoor/
outdoor connecting wire.
No
No
Is there 2 V DC or less between
CN102 (+) and JPG/CN102 *
(GND)(-) on the indoor electronic
control P.C. board?
No Yes
Replace the indoor elec-
tronic control P.C. board.
* JPG: MSZ-EF·VG-
CN102 : MSZ-EF·VG-
43
Check the wiring.
No
Correct them.
Yes
No
Check of power supply.
No
capacitor.
Yes
No
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