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Mitsubishi Electric MSZ-FH12NA Service Manual
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Mitsubishi Electric MSZ-FH12NA Service Manual

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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-FH06NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision D:
• MSZ-FH06NA and MSZ-FH18NA2 have been
added.
Please void OBH683 REVISED EDITION-C.
Outdoor unit service manual
MUZ-FH·NA(H) Series (OBH684)
MXZ-C•NA,NAHZ Series (OCH573)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM ············································ 7
6. REFRIGERANT SYSTEM DIAGRAM ··············· 8
7. SERVICE FUNCTIONS ····································· 9
8. MICROPROCESSOR CONTROL ····················11
9. TROUBLESHOOTING ····································· 20
10. DISASSEMBLY INSTRUCTIONS ···················· 32
PARTS CATALOG (OBB683)
No. OBH683
REVISED EDITION-D

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Summary of Contents for Mitsubishi Electric MSZ-FH12NA

  • Page 1: Table Of Contents

    Please void OBH683 REVISED EDITION-C. INDOOR UNIT INDOOR UNIT No. OBH683 REVISED EDITION-D SERVICE MANUAL Models MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Outdoor unit service manual MUZ-FH·NA(H) Series (OBH684) MXZ-C•NA,NAHZ Series (OCH573) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3.
  • Page 2 Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

  • Page 3: Msz-Fh09Na

    TECHNICAL CHANGES MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 1. New model MSZ-FH18NA 1. New model MSZ-FH06NA MSZ-FH18NA2 1. New model OBH683D...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Front panel Air inlet Emergency operation switch Air filter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter and deodorizing fiter) Horizontal i-see SENSOR vane Air outlet Remote controller...

  • Page 5: Specification

    SPECIFICATION Indoor unit model MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.67 COOL Dry 381- 304 - 221 - 167 - 137 381- 304 - 221 - 167 - 137...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Unit: inch (MSZ-FH06/09/12NA) (MSZ-FH15/18NA/18NA2) OBH683D...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 OBH683D...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1/4 (ø6.35)

  • Page 9: Service Functions

    SERVICE FUNCTIONS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board. (Refer to 9-7.) Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by bridging JPG and JPS.)
  • Page 10 7-4. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.

  • Page 11: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. FAN SPEED CONTROL button...
  • Page 12 8-1. COOL ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons TEMP button to select the desired temperature. The setting range is 61 - 88°F (16 - 31°C).
  • Page 13 8-6. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motors for the horizontal vanes. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL ( ) button.
  • Page 14 (10) POWERFUL ( ) operation The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode. The POWERFUL mode is cancelled automatically 15 minutes after operation starts, or when POWERFUL button is pressed once again within 15 minutes after operation starts. The operation mode returns to the mode prior to POWERFUL operation.
  • Page 15 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
  • Page 16 1. How to set the weekly timer * Make sure that the current time and day are set correctly. (1) Press button to enter the weekly timer setting mode. blinks. (2) Press buttons to select setting day and number E.g. : [Mon Tue ... Sun] and [1] are selected.
  • Page 17 (5) Press button to turn the weekly timer ON. ( lights.) •When the weekly timer is ON, the day of the week whose timer setting is complete, will light. Press button again to turn the weekly timer OFF. ( goes out.) NOTE: The saved settings will not be cleared when the weekly timer is turned OFF.
  • Page 18 8-10. INDIRECT/DIRECT MODE The INDIRECT/DIRECT mode offers fi nely-tuned operation by locating where an occupant is in the room. (1) Press INDIRECT/DIRECT button during COOL, DRY, HEAT or AUTO mode to activate INDIRECT/DIRECT mode. This mode is only available when the i-see control mode is effective. (2) Each press of INDIRECT/DIRECT button changes INDIRECT/DIRECT in the following order: (INDIRECT) (DIRECT)
  • Page 19 8-13. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use Operation mode COOL/HEAT EMERGENCY OPERATION switch on the right side of the indoor unit. Set temperature 75°F (24°C) Emergency operation is available when the remote controller is missing Fan speed Med.

  • Page 20: Troubleshooting

    TROUBLESHOOTING MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 9-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 21 9-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 22 2. Indoor unit failure mode table The left lamp of Abnormal point the OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lighted Normal — — The room temperature thermistor short or 1-time fl ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
  • Page 23 9-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means the If blinking of OPERATION INDI- operation within 30 minutes af- CATOR lamp cannot be checked, Start ter EMERGENCY OPERATION it can be checked with failure switch is pressed. mode recall function. Indoor unit operates.
  • Page 24 9-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes. •...
  • Page 25 9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C.
  • Page 26 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
  • Page 27 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) 1 Look at the image of the signal transmitting section of button on the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
  • Page 28 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
  • Page 29 D How to check miswiring and serial signal error NOTE: Refer to the outdoor unit service manual. Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Check the wiring.
  • Page 30 E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
  • Page 31 9-7. TEST POINT DIAGRAM AND VOLTAGE Indoor power P.C. board, Indoor electronic control P.C. board, Receiver board, Display board, Switch board MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Fuse (F11) Varistor (NR11) Indoor power P.C. board Connector Indoor fan motor Terminal Block...

  • Page 32: Disassembly Instructions

    Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 10-1. MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (1) Remove the horizontal vanes.
  • Page 33 OPERATING PROCEDURE PHOTOS 2. Removing the indoor electrical box Photo 3 Ground wire Electrical box (1) Remove the panels (Refer to 1.) and the right corner box. (2) Remove the screw of the V.A. clamp and V.A. clamp. (3) Remove the screw of the electrical cover and the electrical cover.
  • Page 34 OPERATING PROCEDURE PHOTOS 3. Removing the indoor power P.C. board, the Photo 6 switch board, the display board, the receiver Catch of the DISPLAY AND board and the indoor electronic control P.C. i-see SENSOR ASSEMBLY board (1) Remove the panels (Refer to 1.) and the right corner box.
  • Page 35 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 8 (1) Remove the panels (Refer to 1.) and the right corner Screw of the vertical box. vane motor unit (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to 2.). (4) Disconnect the following connector: <Indoor electronic control P.C.
  • Page 36 OPERATING PROCEDURE PHOTOS 7. Removing the indoor fan motor, the indoor coil Photo 10 Lead wire of the indoor thermistor and the line flow fan coil thermistor (1) Remove the panels (Refer to 1.) and the right corner Water cut box.
  • Page 37 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
  • Page 38 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct. 2015. No. OBH683 REVISED EDITION-D Distributed in Dec. 2014. No. OBH683 REVISED EDITION-C Distributed in Jul. 2014. No. OBH683 REVISED EDITION-B Distributed in Apr.

This manual is also suitable for:

Msz-fh09naMsz-fh06naMsz-fh15naMsz-fh18naMsz-fh18na2

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