Mitsubishi Electric MXZ-3C68VA Service Manual Page 65
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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65
Outdoor electronic control P.C. board
Blinking
(Parts side)
LED1 LED2
LED3
Unit status
LED 1 LED 3LED 2
Pattern
1
2
Unit B
status
Unit D
status
Unit A
status
Unit C
status
Unit E
status
Goes out
Outdoor electronic control P.C. board
Blinking
(Parts side)
LED3 LED2
LED1
LED 3 LED 1LED 2
Pattern
1
2
Unit B
status
Lighting
Unit A
status
Unit D
status
Goes out
Unit C
status
MXZ-3C54VA MXZ-3C68VA
MXZ-4C71VA
MXZ-4C80VA MXZ-5C100VA
Outdoor control P.C. board
Blinking
LED3
LED2
LED1
LED 1 LED 3LED 2
Pattern
1
2
3
Unit B
status
Unit C
status
Unit A
status
Unit D
status
Unit E
status
Unit F
status
Goes out
Lighting
Blinking
MXZ-6C120VA
Is there rated voltage 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 the operation.
Be sure to confirm the wiring is correct before the
operation starts.
(Lighted
or
not lighted)
No
Yes
No
Yes
Yes
No
Yes
No
Be sure to release the failure-mode
recall function after checking.
No
No
Yes
No
Yes
Yes
Yes
No
Yes
Refer to indoor unit service manual.
Turn OFF the power supply.
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Does the left lamp of OPERATION
INDICATOR lamp light up?
<Confirmation of the power to the indoor unit>
Press EMERGENCY OPERATION switch once.
Check the power
supply.
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2 and
S3.
1
B
Turn ON the power supply.
Check the wiring.
Correct them.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor electronic control P.C. board.
2 Be careful of residual
voltage of smoothing capacitor.
Replace the outdoor electronic control P.C.
board or the outdoor control P.C. board.
2
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?
Replace the
indoor/outdoor
connecting wire.
Is serial signal
error indicated
6 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and
turn ON again.
· Press EMERGENCY OPERATION
switch.
B
· Reinstall
either the
unit or the
light away
from each
other.
· Attach a filter
on remote
control
receiving
section of
the indoor
unit.
A
Is serial signal error indicated 6 minutes later?
No
Does the LED on the the outdoor electronic
control P.C. board or the outdoor control P.C.
board repeat "3.6-second-OFF and
0.8-second-ON quick blinking"?
LED indication
for communication status
Communication status is indicated
by the LED.
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
15 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
How to check mis-wiring and serial signal error (when outdoor unit does not work)
• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• When OPERATION INDICATOR lamp flashes ON and OFF every 0.5-second.
Outdoor unit does not operate.
- OUTDOOR UNIT 1
- TECHNICAL CHANGES 2
- PART NAMES AND FUNCTIONS 3
- SPECIFICATION 4
- Compressor 5
- NOISE CRITERIA CURVES 10
- MICROPHONE 11
- OUTLINES AND DIMENSIONS 12
- MXZ-4C71VA 13
- MXZ-4C80VA 14
- MXZ-5C100VA 14
- Unit: mm 15
- WIRING DIAGRAM 16
- MXZ-3C68VA 17
- MXZ-6C120VA 21
- REFRIGERANT SYSTEM DIAGRAM 22
- MAX REFRIGERANT PIPING LENGTH 23
- ADDITIONAL REFRIGERANT CHARGE 23
- PERFORMANCE CURVES 27
- (MPa[Gauge]) 42
- ACTUATOR CONTROL 50
- SERVICE FUNCTIONS 51
- 10-4. AUTO LINE CORRECTING 52
- TROUBLESHOOTING 54
- MXZ-3C/4C/5C 55
- Lighting 60
- MXZ-3C54/3C68/4C71VA 60
- MXZ-4C80/5C100VA 60
- Check of power supply 64
- Turn ON the power supply 64
- (Parts side) 65
- LED indication 65
- Check of R.V. coil 66
- Check of LEV 67
- Check of outdoor fan motor 70
- Check of HPS 72
- The other cases 73
- Check of bus-bar voltage 73
- Defrost thermistor (RT61) 74
- Temperature (°C) 74
- Resistance (kΩ) 74
- 2. Outdoor control P.C. board 76
- 3. Noise filter P.C. board 77
- 4. Outdoor Power board 78
- DISASSEMBLY INSTRUCTIONS 80
- OPERATING PROCEDURE 81
- OPERATING PROCEDURE PHOTOS 82
- 12-3. MXZ-6C120VA 86
- Made in Japan 90
- MXZ-3C54VA COOLING 91
- MXZ-3C54VA HEATING 94
- MXZ-3C68VA COOLING 100
- MXZ-3C68VA HEATING 101
- MXZ-4C71VA COOLING 105
- MXZ-4C71VA HEATING 113
- MXZ-4C80VA COOLING 121
- MXZ-4C80VA HEATING 132
- MXZ-5C100VA COOLING 143
- MXZ-5C100VA HEATING 167
- MXZ-6C120VA COOLING 191
- MXZ-6C120VA HEATING 231
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