Mitsubishi Electric MCFH-A12WV Service Manual Download Page 16 | Manualshive

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Check of indoor electronic control P.C. board

C

The unit does not operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

Replace the fuse.

Trouble of the indoor electronic
control P.C. board.

Replace the varistor.

Yes

Check both “parts side”and “pattern
side” of indoor electronic control P.C.
board visually.

No

Is varistor(NR11)burnt?

Yes

Is fuse(F11)blown?

Check of indoor electronic control P.C. board

D

When OPERATION INDICATOR lamp flashes 4 - time.

Indoor unit does not operate.

Turn off the power supply.

Replace the indoor electronic
control P.C. board.

No

Be sure to check both fuse
and varistor in any case.

OB336--1.qxp 04.1.6 11:13 AM Page 16

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Summary of Contents for MCFH-A12WV

Page 1: ...al OB337 As for outdoor unit MUH A12YV refer to the service manual OB331 As for outdoor units MXZ A18 A26 A32WV refer to the service manual OB319 E1 E1 E1 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 2 3 SPECIFICATION 4 4 NOISE CRITERIA CURVES 5 5 OUTLINES AND DIMENSIONS 6 6 WIRING DIAGRAM 7 7 REFRIGERANT SYSTEM DIAGRAM 8 8 SERVICE FUNCTIONS 9 9 TROUBLESHOOTING 11 10 DISASSEMBLY INSTR...

Page 2: ...or electronic control P C board has changed 3 Horizontal vane has changed 4 Terminal block has changed 5 Indoor heat exchanger has changed 6 Remote controller has changed Econo cool operation has been added 7 Indoor fan motor has changed RB4V25 AB RB4V25 AC E1 E4 MCFH 18NV MCFH A18WV 1 Rated voltage has changed 220 240V 230V 2 Indoor electronic control P C board has changed 3 Horizontal vane has c...

Page 3: ...F TOO COOL PM AM TOO WARM Open the front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button ON TIMER button RESET button ECONO COOL button VANE CONTROL button CLOCK SET button HR button MIN button TIME SET button Indication of remote controller model is on back ...

Page 4: ...92W 10 0 30 0 066 96 0 30 RB4V25 AC WHT BLK 182 2 BLK YLW 68 9 YLW BLU 47 5 BLU BRN 31 5 BRN RED 22 9 25 5 46 41W 36W 1 240 1 060 845 3 10 10 KG04C Cooling Heating Single phase 230V 50Hz 840 696W 570W 10 0 36 0 080 97 0 36 RB4V36 AC WHT BLK 82 9 BLK YLW 65 6 YLW BLU 36 0 BLU BRN 27 0 BRN RED 13 7 1100 650 180 25 5 48 44W 39W 1 320 1 145 960 3 10 10 KG04C Cooling Heating 840 744W 642W 10 0 36 0 080...

Page 5: ...0 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling DB 27 WB 19 Heating DB 20 WB 15 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE High SPEED 46 SPL dB A LINE MCFH A18WV E1 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSU...

Page 6: ...cm or more 50cm or more 50cm or more 50cm or more 100cm or more 650 616 5 80 8 906 112 8 114 16 1100 93 77 113 143 180 170 42 5 12 7 MCFH A12 A18WV 15 88 MCFH A24WV Gas line 6 35 Liquid line Wireless remote controller 162 19 58 INDOOR UNIT MCFH A12WV MCFH A18WV MCFH A24WV E1 E1 E1 Unit mm ...

Page 7: ... 230V BRN SR141 LDFVL TB2 PE CIRCUIT BREAKER HIC1 F11 NR11 TRANS MODELS WIRING DIAGRAM SYMBOL SR141 SR143 TB1 TB2 X144 SYMBOL MV NR11 RT11 RT12 NAME NAME NAME INDOOR FAN CAPACITOR FUSE 3 15A DC DC CONVERTER INDOOR FAN MOTOR INNER FUSE VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK RELAY 1 About the outdoor side electric wiring refer to the o...

Page 8: ...coil thermistor RT12 Indoor heat exchanger Distributor Flared connection Room temperature thermistor RT11 Indoor coil thermistor RT12 Flared connection Refrigerant pipe 12 7 with heat insulator Refrigerant pipe 6 35 with heat insulator INDOOR UNIT MCFH A12WV E1 Indoor heat exchanger Distributor Flared connection Room temperature thermistor RT11 Indoor coil thermistor RT12 Flared connection Refrige...

Page 9: ...its operation Same as at left Solder J1 3 units operation Same as at left Same as at left Solder J2 4 units operation Same as at left Same as at left Same as at left Solder both J1 and J2 The P C board has the print J1 and J2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press the RESET button How to set the remote controller exclusively for particu...

Page 10: ...function does not work as the power button of the remote controller is off To prevent breaker off due to the rush of starting current systematize other home appliances not to turn on at the same time When some air conditioners are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore th...

Page 11: ...e the remote controller normally 1 Remove the front lid and insert batteries Then reattach the front lid 2 Press the RESET button with tip end of ball point pen or the like and then use the remote controller NOTE If the RESET button is not pressed the remote controller may not operate correctly MCFH A12WV MCFH A18WV MCFH A24WV E1 E1 E1 RESET button Insert the negative pole of the batteries first C...

Page 12: ...indoor coil thermistor Refer to Test point diagram and voltage on page 18 4 time flash Cause Indoor unit Trouble of indoor electric P C board Refer to D Check of indoor electric control P C board on page 16 Refer to E How to check mis wiring and serial signal error When outdoor unit doesn t work on page 17 1 Check indoor outdoor connecting wire 2 Refer to C Check of indoor electronic control P C b...

Page 13: ...OB319 5 MXZ type Outdoor power system 5 time flash 2 5 second OFF Outdoor unit does not run When the compressor operation is continuously three times interrupted by over current protection within 1 minute after start up it stops operation Check the inverter output Check the compressor Refer to service manual OB319 6 MCFH A24WV MXZ type Outdoor control P C board 7 time flash 2 5 second OFF Outdoor ...

Page 14: ...terion Measure the resistance with a tester Part temperature 10 C 30 C Figure Normal 8kΩ 20kΩ Abnormal Open or short circuit Vane motor MV Measure the resistance between the terminals with a tester Part temperature10 C 30 C Normal Abnormal Open or short circuit 328 356Ω MCFH A12WV MCFH A18WV MCFH A24WV E1 E1 E1 BLK RED ORN YLW BLU BRN WHT GRN YLW FUSE YLW GRN ORN BRN RED ROTOR Normal MCFH A18WV WH...

Page 15: ...by pressing the EMERGENCY OPERATION switch but does not operate with the remote con troller Replace the batteries Refer to page 11 Turn on a radio to AM and press switch on remote controller Is noise heard from radio Are there any fluorescent lights of inverter or rapid start type within the range of 1m Is the voltage approx 4V DC Replace the indoor electronic control P C board Replace the receive...

Page 16: ...electronic control P C board Replace the varistor Yes Check both parts side and pattern side of indoor electronic control P C board visually No Is varistor NR11 burnt Yes Is fuse F11 blown Check of indoor electronic control P C board D When OPERATION INDICATOR lamp flashes 4 time Indoor unit does not operate Turn off the power supply Replace the indoor electronic control P C board No Be sure to ch...

Page 17: ...r the stylus is between 5 10V DC Replace the deicer P C board Rectify indoor outdoor unit connecting wire Check and rectify fuse and varistor on the deicer P C board Rectify indoor outdoor unit connecting wire Replace the indoor electronic control P C board w 1 Short circuit of JPG and JPS on the electronic control P C board enables self check to be displayed in 3 seconds Repair wiring Is there mi...

Page 18: ...V E1 E1 E1 Indoor electronic control P C board Fan motor power supply 230V AC 7 5 6 4 3 2 1 8 Med High Fuse F11 250V AC 3 15A Power supply input 230V AC 12V DC 5V DC Time short point JPG and JPS Refer to page 9 Indoor coil thermistor RT12 Room temperature thermistor RT11 Very Low Low Solder jumper wire to the JR07 on the indoor electronic control P C board Refer to page 10 Room temperature thermis...

Page 19: ...o 2 Photo 3 Screws Electronic box Terminal block 10 1 MCFH A12WV MCFH A18WV MCFH A24WV INDOOR UNIT E1 E1 E1 Electronic control P C board Slide the sleeve and check if there is a locking lever or not 1Slide the sleeve 2Pull the terminal while pushing the locking lever In case of terminal with lock mechanism detach the terminal as shown below There are two types Refer to 1 and 2 of the terminal with...

Page 20: ...he drain pan and remove the screws Photo 7 9 Remove the screws under the drain pan Photo 8 10 Remove the drain pan 11 Remove the indoor heat exchanger Photo 5 Photo 6 Photo 7 Photo 8 Screws Insulation and screws screws Screws 2 Removing the indoor fan motor 1 Remove the grille Refer to 1 1 2 2 Remove the fan casing upper 3 Disconnect the connector of the indoor fan motor 4 Disconnect the ground wi...

Page 21: ...LLE CATCH WH 12 7 15 88 6 35 3PCS SET 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 MV MCFH A12WV E02 227 303 E02 179 971 E02 179 100 E02 179 010 E02 179 000 E02 215 700 E02 179 237 E02 179 238 E02 179 667 E02 138 666 E02 179 972 E02 138 667 E02 179 231 E02 227 235 E02 823 620 E02 824 620 E02 227 040 E02 179 142 No Part No Remarks Part name Symbol ...

Page 22: ...12 NR11 F11 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER SW THERMO P C BOARD E1 WH Q ty unit MCFH A12WV E02 179 500 E02 179 505 E02 228 300 E02 229 300 E02 684 300 E02 826 375 E02 823 375 E02 227 468 E02 327 307 E02 826 452 E02 827 452 E02 828 452 E02 215 328 E02 820 385 E02 127 382 No Part No Remarks Part name Symbol in Wiring Diagram E1 WH MCFH A18WV E1 WH MCFH A24WV 2PCS SET RB4V25 RB4V36 RB4V36 ...

Page 23: ...capacity or cause condensation at the air outlet The air cleaning filter is disposable The standard usable term is about 4 months However if the color of the filter turns to dark brown replace soon Models MCFH A12WV MCFH A18WV MCFH A24WV E1 E1 E1 Part No MAC 1700 DF Remove the air filter and the deodorizing filter together Separate the deodorizing filter gray sponge type from the air filter Remove...

Page 24: ...Specifications subject to change without notice C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2004 No OB336 6 Made in Japan HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN ...

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