Revision D: • MSZ-FH06NA and MSZ-FH18NA2 have been added. Please void OBH683 REVISED EDITION-C. 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. SPECIFICATION ················································ 5 4.
Use the specified 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. Revision A: • 3. SPECIFICATION has been modified.
1 TECHNICAL CHANGES MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 1. New model MSZ-FH18NA 1. New model MSZ-FH06NA MSZ-FH18NA2 1.
2 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 vane i-see SENSOR Air outlet Remote controller Remote control receiving section Operation indicator lamp ACCESSORIES Model Installation plate MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 1 Attachment scr
3 SPECIFICATION Indoor unit model Power supply V, phase, Hz Disconnect switch A Min. circuit ampacity A Fan motor F.L.A COOL Dry Airflow CFM (Wet) Super high - High Med. - Low - Quiet HEAT Dry CFM Moisture removal pt./h Sound level Cooling dB(A) Super high - High Heating dB(A) Med. - Low - Quiet Cond. drain connection O.D. in. W Dimensions D in. H Weight Ib. External finish Remote controller Control voltage (by built-in transformer) MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 208/230 , 1 , 60 15 1.0 0.
4 OUTLINES AND DIMENSIONS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Unit: inch (MSZ-FH06/09/12NA) OBH683D (MSZ-FH15/18NA/18NA2) 6
5 WIRING DIAGRAM MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 OBH683D 7
6 REFRIGERANT SYSTEM DIAGRAM MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12 (main) Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Refrigerant pipe ø1/2 (ø12.
7 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.) 7-2.
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. Operation If the main power has been cut, the operation settings remain. After the power is restored, the unit restarts automatically according to the memory.
8 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.
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. or button to select the desired temperature. (3) Press TEMPERATURE buttons TEMP The setting range is 61 - 88°F (16 - 31°C). 1. Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.
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 ( AUTO 1 2 3 4 5 ) button. SWING NOTE: The right and left horizontal vanes set to the same level may not align perfectly.
(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.
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. The unit turns off at 11:00 PM, and on at 6:00 AM. (Example 2) The current time is 11:00 AM. The unit turns on at 5:00 PM, and off at 9:00 PM. NOTE: If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is cancelled.
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. * (2) Press and blinks. buttons to select setting day and number. E.g. : [Mon Tue ... Sun] and [1] are selected. Pressing selects the day of the week to be set. Pressing selects the setting number. * All days can be selected. (3) Press , , and buttons to set ON/OFF, time, and temperature. E.g. : [ON], [AM 6:00] and [75°F (24°C)] are selected.
(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. 2. Checking weekly timer setting (1) Press * button to enter the weekly timer setting mode. blinks. (2) Press (3) Press or buttons to view the setting of the particular day or number.
8-10. INDIRECT/DIRECT MODE The INDIRECT/DIRECT mode offers finely-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) (OFF) (INDIRECT) : An occupant will be less exposed to direct airflow.
8-13. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down. The unit will start and OPERATION INDICATOR lamp will light up. The first 30 minutes of operation is the test run operation. This operation is for servicing.
9 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.
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. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
2. Indoor unit failure mode table The left lamp of Abnormal point the OPERATION (Failure mode) INDICATOR lamp Not lighted Normal Condition Remedy — The room temperature thermistor short or 1-time flash every Room temperature open circuit is detected every 8 seconds dur0.5-second thermistor ing operation. Indoor coil 2-time flash The indoor coil thermistor short or open circuit 2.5-second OFF is detected every 8 seconds during operation.
9-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed. Start Indoor unit operates. Outdoor unit does not operate. Indoor unit operates. Outdoor unit does not operate normally. Indoor unit does not receive the signal from remote controller. If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. LEFT lamp of the OPERATION INDICATOR lamp is flashing ON and OFF.
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. • The following indicator applies regardless of shape of the indication. OPERATION INDICATOR Lighted Blinking Not lighted No.
9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2 Part name Room temperature thermistor (RT11) Indoor coil thermistor (RT12, RT13) Indoor fan motor (MF) Vane motor (MV1) (HORIZONTAL) Vane motor (MV2) (VERTICAL) i-see SENSOR MOTOR (MT) OBH683D Check method and criterion Measure the resistance with a tester. Figure Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C. board", for the chart of thermistor. Check 9-6.
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. Is there any foreign matter that interferes the rotation of the line flow fan? Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.
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) button on the remote controller. Is LCD display on the remote controller visible? Yes No (Not clear) 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone.
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 motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch? No Yes Measure the resistance of indoor fan motor. Refer to 9-5. Short circuit: Replace the indoor fan motor.
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? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Yes No Check the wiring. Press EMERGENCY OPERATION switch once.
E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Yes Is the distance between the antennas and the indoor unit within 9.91 ft. (3m), or is the distance between the antennas and the outdoor unit within 9.91 ft. (3m)? No Ground the unit. No Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Yes Is the distance between the TV sets or radios and the indoor unit within 3.28 ft.
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) Indoor power P.C. board Varistor (NR11) Connector Terminal Block (CN201) Indoor fan motor (CN211) (+)0 or 15 VDC (+)3-6 VDC 15 VDC (–) GND (highvoltage DC) 294/325 VDC Resistor (R111) 5 VDC GND 12 VDC Connector to indoor electronic control P.C.
10 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 types (Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve (2) The terminal with this connector has the locking mechanism.
OPERATING PROCEDURE PHOTOS 2. Removing the indoor electrical box Photo 3 (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. (4) Disconnect following connectors: CN151 (Vane motor) CN211 (Indoor fan motor) CN110 (DISPLAY AND i-see SENSOR ASSEMBLY) (5) Remove DISPLAY AND i-see SENSOR ASSEMBLY.
OPERATING PROCEDURE PHOTOS 3. Removing the indoor power P.C. board, the switch board, the display board, the receiver board and the indoor electronic control P.C. board Photo 6 Catch of the DISPLAY AND i-see SENSOR ASSEMBLY (1) Remove the panels (Refer to 1.) and the right corner box. (2) Remove the indoor electrical box (Refer to 2.). (3) Remove the ground wire connected to the electrical box from the indoor power P.C. board. (4) Disconnect the following connectors:
OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 8 (1) Remove the panels (Refer to 1.) and the right corner box. (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to 2.). (4) Disconnect the following connector: CN151 (Vane motor) (5) Remove the DISPLAY AND i-see SENSOR ASSEMBLY. (6) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
OPERATING PROCEDURE PHOTOS 7. Removing the indoor fan motor, the indoor coil thermistor and the line flow fan Photo 10 Lead wire of the indoor coil thermistor (1) Remove the panels (Refer to 1.) and the right corner box. (2) Remove the indoor electronic control P.C. board holder, the electrical box and the nozzle assembly. (3) Remove the screws fixing the motor bed. (4) Release the hooks of the water cut and remove the water cut. (5) Loosen the screw fixing the line flow fan.
Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. Clip shape Holder shape When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1. Set the indoor coil thermistor in the center of the clip-shape part. 2. Check the (marked) mounting position. 3. Mount the clip-shape part.
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. 2014. No. OBH683 REVISED EDITION-A Distributed in Feb. 2014. No. OBH683 Made in Japan New publication, effective Oct. 2015 Specifications are subject to change without notice.
