Indoor Service Manual
Table Of Contents
- Cover
- Contents
- 1. SAFETY PRECAUTION
- 2. PART NAMES AND FUNCTIONS
- 3. SPECIFICATION
- 4. FAN PERFORMANCE AND CORRECTED AIR FLOW
- 5. SOUND PRESSURE LEVELS
- 6. OUTLINES & DIMENSIONS
- 7. WIRING DIAGRAM
- 8. REFRIGERANT SYSTEM DIAGRAM
- 9. HEATER CONTROL
- 10. HUMIDIFIER CONTROL
- 11. ERV (ENERGY RECOVERY VENTILATION) CONTROL
- 12. TROUBLESHOOTING
- 12-1. Cautions on troubleshooting
- 12-2. Self-check function
- 12-3. Self-diagnosis action table
- 12-4. Troubleshooting by inferior phenomena
- 12-5. Test point diagram
- 12-6. Trouble criterion of main parts
- 12-7. Thermistor
- 12-8. DC Fan motor (FAN MOTOR/INDOOR CONTROLLER BOARD)
- 12-9. Functions of dip switch and jumper wire
- 13. DISASSEMBLY PROCEDURE
- Back Cover
Specications are subject to change without notice. © 2016 Mitsubishi Electric US, Inc.
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12
TROUBLESHOOTING
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12
TROUBLESHOOTING
Lead wires
12-1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
HWE1406A.qx 3/19/15 9:02 AM Page 21
12-1. Cautions on troubleshooting
(1) Before troubleshooting, check the followings:
1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.