Mitsubishi SEZ-A12AR Technical & Service Manual Download Page 12

Page: 12 / 24

6-3. Trouble shooting

(1) In case of being indicated irregularity on the self diagnoses

Mis-wiring

6800

5102

5101

Indoor-outdoor
signal error

Wiring between the indoor and
outdoor is coming off.

Difference of wiring polarity
between the indoor and outdoor.

Trouble of the outdoor inverter
P.C. board.

Check the wiring out between the indoor and
outdoor.

Check the outdoor inverter P.C. board. Refer to the
TECHNICAL & SERVICE MANUAL of outdoor unit.

Trouble of the Indoor controller
board.

Exchange the Indoor controller board.

Pipe temperature thermistor
/ Liquid.

Mis-connecting of the pipe
temperature thermistor / Liquid.

Reinsert the connector (CN21).

Trouble of the pipe temperature
thermistor / Liquid.

Trouble of the Indoor controller
board.

Exchange the Indoor controller board.

Check the resistance value of the thermistor.

Room temperature
thermistor

Mis-connecting of the room
temperature thermistor.

Reinsert the connector (CN20).

Trouble of the room temperature
thermistor.

Trouble of the Indoor controller
board.

Exchange the Indoor controller board.

Check the resistance value of the thermistor.

Condenser / evaporator
temperature thermistor

Mis-connecting of the condenser /
evaporator temperature thermistor.

Reinsert the connector (CN29).

Trouble of the condenser / evaporator
temperature thermistor.

Trouble of the Indoor controller
board.

Exchange the Indoor controller board.

Check the resistance value of the thermistor.

Phenomenon

Check

code

Cause

Countermeasure

1503

0405
1501
4210

Freezing protection is
working.

1) Short cycle of air cycle
2) Dirty air filter
3) Damaged fan
4) Abnormal refrigerant

1) Clear obstructions from air cycle.
2) Clean the air filter
3) Check the fan
4) Check the refrigerant temperature.

Malfunction of outdoor unit

Refer to the TECHNICAL & SERVICE MANUAL
of outdoor unit.

Outdoor thermistor

Mis-connecting of the outdoor
thermistor.

Reinsert the connector.

Trouble of the outdoor thermistor.

Trouble of the outdoor inverter P.C.
board.

Exchange the outdoor inverter P.C. board.

Check the resistance value of the thermistor.

OC303-A-1.qxp 04.9.21 4:08 PM Page 12

Summary of Contents for SEZ-A12AR

Page 1: ...H SEZ A24AR SEZ A24AR TH SPLIT TYPE HEAT PUMP AIR CONDITIONERS WIRED REMOTE CONTROLLER ON OFF CENTRALLY CONTROLLED ERROR CODE CLOCK ON OFF C CHECK CHECK MODE FILTER TEST RUN FUNCTION C 1Hr NOT AVAILAB...

Page 2: ...on 2 SPECIFICATIONS has been modified on page 5 and 6 Service Ref Page 5 5 6 SEZ A12AR TH SEZ A18AR TH SEZ A24AR TH Incorrect Revise point Correct Electrical date Power input Rated frequency 33 48 49...

Page 3: ...tton This switches between continuous operation and the timer operation TIMER button This switches between the operation and stop modes each time it is pressed The lamp on this button lights during op...

Page 4: ...The current time start time and stop time can be displayed in ten second intervals by pressing the time switch button The start time or stop time is always displayed during the timer operation Display...

Page 5: ...Thermistor RT13 at 25 Remote controller model K h A A W A kW A mm kg dB A rpm k k k Electrical data Fan motor Special remarks Capacity WHT BLK 251 4 BLK BLU 19 9 BLU YLW 26 5 YLW BRN 13 2 BRN RED 50 0...

Page 6: ...WoHoD Weight Air direction Sound level High Low Fan speed High Low Fan speed regulator Thermistor RT11 at 25 Thermistor RT12 at 25 Thermistor RT13 at 25 Remote controller model K h A A W A kW A mm kg...

Page 7: ...Hz SEZ A12AR TH Hi Lo 35 SPL dB 30 LINE 50Hz NOTCH NOISE CRITERION CURVES UNIT External static pressure 30Pa 1 5m MICROPHONE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE T...

Page 8: ...ize Air inlet bottom side 24 2 9 holes 24 2 9 holes 215 120 12 5 240 450 1 4F flared connection 6 35mm It is necessary to maintain a working service area from the ceiling 150 10 50 Electrical parts bo...

Page 9: ...ing connection showing fig 1 Indoor Fan Motor MF for 60Hz 2 About the outdoor side electric wiring refer to the outdoor unit electlic wiring diagram for servicing 3 Use copper conductors only For fiel...

Page 10: ...50 Condenser evaporator temperature thermistor RT13 Room temperature thermistor RT11 Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe...

Page 11: ...A B C ERROR CODE CHECK CHECK MODE CHECK CHECK MODE D E 6 2 Self check function Wired remote controller 1 Turn on the power 2 Press the CHECK button twice 3 Set refrigerant address with TEMP button if...

Page 12: ...le of the room temperature thermistor Trouble of the Indoor controller board Exchange the Indoor controller board Check the resistance value of the thermistor Condenser evaporator temperature thermist...

Page 13: ...door Difference of wiring polarity between the indoor and outdoor Trouble of the outdoor inverter P C board Trouble of the contactor 52C Exchange the contactor Check the outdoor inverter P C board Mal...

Page 14: ...the devices Are there any devices emitting noise near the power supply or the connecting wire between the indoor and outdoor units Check code 5101 Measure the resistance of room temperature thermisto...

Page 15: ...ure thermistor Is the connector CN29 on the indoor controller board connected Refer to the TECHNICAL SERVICE MANUAL of outdoor unit Is the error of indoor unit Connection is defective Condenser evapor...

Page 16: ...T12 Condenser evaporator temperature thermistor RT13 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Thermistor for lower temperature Temperature Resistance K Fuse 250V AC 3 15A Room temperature thermistor RT...

Page 17: ...etween the terminals with a tester Coil wiring temperature 10 C 30 C P Thermal fuse 145 2 C Pipe temperature thermistor liquid RT12 Indoor fan motor MF Check method and criterion Part name Normal A12A...

Page 18: ...ipe temperature thermistor liquid Front panel Set screws for drain pan Set screws Terminal block Photo 2 Photo 3 Photo 1 SEZ A12AR TH SEZ A18AR TH SEZ A24AR TH Electrical parts cover Service panel Con...

Page 19: ...t panel at fan side 12 screws See Photo 1 3 Disconnect the fan motor connector FAN1 FAN2 from the indoor controller board See Photo 2 4 Undo the 4 claws and remove the fan claws down side Either left...

Page 20: ...nger side 16 screws See Photo 8 3 Remove the 4 screws of heat exchanger 2 screws each on left and right See Photo 9 4 Remove the thermistor RT12 from the holder Refer to 2 5 Remove the thermistor RT13...

Page 21: ...E RIGHT LEG E07 039 086 E07 039 500 E02 179 505 E07 039 300 E07 040 300 E07 041 300 E07 143 308 E07 039 000 E07 039 700 E07 143 309 E07 136 307 E07 143 620 E07 144 620 E07 145 620 E07 143 085 E07 143...

Page 22: ...NTROLLER REMOTE CONTROLLER CABLE CONTROLLER COVER E07 143 447 E07 144 447 E07 145 447 E07 140 340 E02 127 382 E02 661 385 E02 257 375 E02 367 377 E02 007 375 E07 136 426 E07 018 089 E07 039 449 I B I...

Page 23: ...d unit SEZ A12AR TH SEZ A18AR TH Models Pipe length Pipe size O D mm in Cross section A Gas 9 52 3 8 15 88 5 8 6 35 1 4 27 31 21 27 0 60 150 300 0 40 100 200 B liquid Insulation C D 3m 5m 7m 10m 15m 3...

Page 24: ...YO 100 8310 JAPAN CCopyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Sep 2004 No OC303 REVISED EDITION A PDF 8 Distributed in Mar 2004 No OC303 PDF 8 Made in Japan New publication e...

Search results

Summary of Contents for SEZ-A12AR

Reviews:

Related manuals for SEZ-A12AR

Brands by name

Popular brands

Mitsubishi SEZ-A12AR, Technical & Service Manual

Search results

Summary of Contents for SEZ-A12AR

Reviews:

Related manuals for SEZ-A12AR

Brands by name

Popular brands