Mitsubishi MXZ-2A52VA Service Manual Page 131
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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131
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
Yes
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 inverter P.C. board or
the outdoor electronic 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?
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?
No
Replace the
indoor/outdoor
connecting wire.
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 outdoor display P.C.
board or the outdoor electronic
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.
Outdoor electronic control P.C. board
Blinking
LED 3
Lighting
Goes out
LED 1LED 2
(Parts side)
LED3 LED2
LED1
Outdoor electronic control P.C. board
Blinking
(Parts side)
LED1 LED2
LED3
Outdoor display P.C. board
MXZ-2A52VA
Blinking
LED1 LED2
LED 1 LED 2
MXZ-3A54VA
MXZ-4A71VA
MXZ-4A80VA - E1
MXZ-4A80VA - E2
MXZ-5A100VA
Unit status
Pattern
1
2
Unit B
status
Unit D
status
Unit A
status
Unit C
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
Unit A
status
Unit B
status
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 in every 0.5-second.
Outdoor unit does not operate.
- SERVICE MANUAL 1
- TECHNICAL CHANGES 2
- Description 6
- 3. Refrigeration oil 7
- 4. Air purge 7
- 5. Additional charge 7
- 2. Refrigerant piping 7
- PART NAMES AND FUNCTIONS 8
- Indoor units 10
- Indoor units combination 11
- INDOOR UNITS COMBINATION4 14
- MXZ-2A40VA 15
- MXZ-2A52VA 16
- MXZ-3A54VA 17
- MXZ-4A71VA 21
- MXZ-5A100VA 39
- SPECIFICATION 61
- Compressor 62
- NOISE CRITERIA CURVES 66
- OUTDOOR UNIT 67
- MICROPHONE 67
- OUTLINES AND DIMENSIONS 68
- REQUIRED SPACE 69
- 1.Installation space 70
- 2.Service space 70
- MXZ-4A71VA 72
- WIRING DIAGRAM 75
- MXZ-3A54VA 76
- REFRIGERANT SYSTEM DIAGRAM 87
- R.V. coil 88
- OFF 88
- ON 88
- Refrigerant flow in cooling 88
- Refrigerant flow in heating 88
- OFF 90
- ON 90
- R.V. coil 91
- MXZ-4A80VA 94
- MAX REFRIGERANT PIPING LENGTH 94
- PERFORMANCE CURVES 97
- , MXZ-2A52VA) 101
- (MPa[Gauge]) 109
- ACTUATOR CONTROL 115
- SERVICE FUNCTIONS 116
- 12-4. AUTO LINE CORRECTING 117
- <MXZ-2A> 117
- <MXZ-4A80VA 118
- , MXZ-5A100VA> 118
- TROUBLESHOOTING 120
- Lighting 126
- MXZ-3A/4A/5A 127
- (MXZ-3A54VA, MXZ-4A71VA)/ 128
- MXZ-3A54VA 129
- MXZ-4A71VA 129
- MXZ-2A30/2A40/2A52 130
- MXZ-3A54/4A71/4A80/5A100 130
- LED3 LED2 131
- LED1 LED2 131
- Check of R.V. coil 132
- Check of LEV 133
- EMERGENCY OPERATION 134
- E4 E5E5 E6 E7 E6 E7E4 E2 135
- Check of outdoor fan motor 136
- Check of HPS 137
- The other cases 137
- Check of bus-bar voltage 137
- 1. Inverter P.C. board 138
- Resistance (kΩ) 139
- Temperature (°C) 139
- MXZ-4A80VA 140
- MXZ-5A100VA 140
- MXZ-5A100VA 142
- 5. Outdoor Power board 143
- 6. Display P.C. board 144
- 7. Interface P.C. board 144
- DISASSEMBLY INSTRUCTIONS 145
- OPERATING PROCEDURE 146
- 1. Removing the compressor 148
- OPERATING PROCEDURE PHOTOS 150
- 14-4. MXZ-4A80VA 154
- 14-5. MXZ-4A80VA 157
- MXZ-2A40VA 160
- MXZ-2A52VA 160
- 15-3. DRAIN SOCKET 163
- Indoor unit connecting 167
- 15-9. ACCESSORY 170
- 3.0 1.4 600 173
- 3.0 2.0 200 173
- Outdoor unit 42 drain hole 175
- Soft vinyl chloride hose of 175
- 25 mm inside diameter 175
- 16-12. ACCESSORY 186
- MXZ-5A100VA 188
- 16-15. ACCESSORY 190
- OPTIONAL PARTS 192
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