Mitsubishi Electric MSZ-FD25VA Service Manual Download Page 30

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

Check of indoor P.C. board and indoor fan motor

Yes

1. The fan motor connector's

lead wire is red, whereas

is black.

2. Connect "+" of the tester to fan motor connector's

lead

wire, and "-" to

lead wire, otherwise the resistance cannot be

measured properly.

Yes

Does the unit operate with the remote controller?
Does POWER lamp light up by pressing EMERGENCY
OPERATION switch?

Turn OFF the power supply.
Remove indoor fan motor connector CN211, vane motor
connector CN151 and the i-see Sensor motor connector
CN110 from the indoor electronic control P.C. board and
turn ON the power supply.

Measure the resistance of the horizontal vane
motor coil and the vertical vane motor coil.
Refer to 10-5.

Measure the resistance between CN211

and

of the indoor fan motor connector.

Short/open circuit:
Replace the indoor fan motor.

Short/open circuit:
Replace the horizontal vane motor, the
vertical vane motor and the indoor
electronic control P.C. board.

Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control P.C.
board visually.

Replace the varistor(NR11) and fuse(F11).

Are the varistor(NR11) burnt
and the fuse(F11) blown?

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

Yes

Is the fuse(F11) blown only?

Yes

Is the resistance 1 M

or more?

Measure the resistance between

(+) and

(-) of the indoor fan

motor connector.

Replace the fuse (F11).

Replace the fuse (F11) and the indoor fan motor.

Is the resistance
approx. 4

Measure the resistance of cement
resistor(R111) on the indoor electronic
control P.C. board.

Replace the indoor electronic control P.C. board.

Replace the indoor electronic control P.C. board
and the indoor fan motor.

Yes

Measure the resistance of the i-see Sensor
motor coil.
Refer to 10-5.

Short/open circuit:
Replace the i-see Sensor motor
and the indoor electronic control P.C.
board.

OBH488-1.qxp 07.8.9 11:47 AM Page 30

Summary of Contents for MSZ-FD25VA

Page 1: ...MICROPROCESSOR CONTROL 11 10 TROUBLESHOOTING 20 11 DISASSEMBLY INSTRUCTIONS 36 MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS E1 E1 E1 E1 SPLIT TYPE HEAT PUMP AIR CONDITIONERS NOTE RoHS compliant products have G mark on the spec name plate Outdoor unit service manual MUZ FD VA Series OBH489 MXZ A VA Series OB377 MXZ 8A140A OC316 SERVICE MANUAL Wireless type Models No OBH488 INDOOR UNIT PARTS CATALO...

Page 2: ...2 ...

Page 3: ...3 1 TECHNICAL CHANGES MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS E1 E1 E1 E1 1 New model ...

Page 4: ...tically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room sensible temperature Operation Indicator lamp Remote control receiving section Emergency operation switch Fan Fan guard i see sensor Heat exchanger Air inlet Plasma anti allergy enzyme filter Plasma electrode unit Plasma deodorizing filter AREA lamp POWER lamp CLEAN lamp PLASMA lamp A...

Page 5: ... High Air flow High Med Low Sound level Super High Sound level High Med Low Fan speed Super High Fan speed High Med Low Fan speed regulator Remote controller model W A A mm kg K h K h dB A dB A rpm rpm Electrical data Special remarks Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating MSZ FD25VAS MSZ FD35VA...

Page 6: ...NCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED HEATING Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 Heating Dry bulb temperature 20 43 43 NC 10 MSZ FD35VA MSZ FD35VAS 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 PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUN...

Page 7: ...nstallation plate 5 257 Installation plate Piping Drain hose Air in Air out 19 159 58 Piping Insulation 35 O D Liquid line 6 35 0 5 m Flared connection 6 35 Gas line 9 52 0 43 m Flared connection 9 52 Drain hose Insulation 28 O D Connected part 16 O D 7 OUTLINES AND DIMENSIONS 5 Unit mm MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS 6 WIRING DIAGRAM MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS ...

Page 8: ...exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe 9 52 with heat insulator Refrigerant pipe 6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Unit mm ...

Page 9: ...eft Same as at left Same as at left Solder both J1 and J2 Table 1 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit only accept the signal from the remote controller that has been assigned to the indoo...

Page 10: ... P C board AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation 1 If the main power has been cut the operation settings remain 2 After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running How to release AUTO RESTART FUNCTION 1Turn OFF...

Page 11: ...ng clean operation Refer to 9 9 Lamp lights during operation Lamp blinks in abnormal condition AREA POWER CLEAN PLASMA MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS ON TIMER button CLOCK SET button TIME SET buttons FORWARD button BACKWARD button OFF TIMER button RESET button VANE CONTROL button WIDE VANE button Vertical vane button CLEAN button AREA button i see button Signal transmitting section ...

Page 12: ...ION SELECT button 3 Press TEMPERATURE buttons TOO WARM or TOO COOL button to select the desired temperature The setting range is 16 31 C 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high p...

Page 13: ...s a The operation starts or finishes including timer operation b The test run operation starts c Standby mode only during multi system operation starts or finishes 9 5 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle of the motor are controlled by pulse signals approx 12 V transmi...

Page 14: ...dy Horizontal position 10 ECONO COOL operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 2 C higher Also the horizontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved ECONO COOL oper...

Page 15: ... the indoor unit is moved with the stepping motor and it detects the floor wall temperature i see Sensor is installed here Enlarged view of i see Sensor i see Sensor When AREA setting is not activated the sensing range of i see Sensor differs depending on the installation location of the air conditioner Refer to Remote controller in SERVICE FUNCTIONS Install the front panel correctly after being r...

Page 16: ...g on the remote controller The horizontal air flow direction is controlled in this range Installed at center Installed at left Installed at right Indoor unit display AREA Remote controller display or or Lighted Not lighted L R L R L R L R L R Ex In COOL mode Moving of horizontal air flow direction Indoor unit display NOTE Indication of AREA setting Lighted Not lighted The horizontal air flow direc...

Page 17: ...eft and center The sensor finishes turning to one area to another for 3 seconds and it operates one area for 5 seconds 17 1 Press OPERATE STOP ON OFF button to start the air conditioner 2 Press PLASMA button to set PLASMA operation PLASMA lamp turns ON and plasma electrode unit is energyzed 3 Press PLASMA button again to cancel PLASMA operation 9 8 PLASMA OPERATION Description of PLASMA operation ...

Page 18: ...is pressed the set time decreases by 10 minutes START STOP 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the display of set time disappears START STOP PROGRAM TIMER Example 1 The current time is 8 00 PM The unit turns off at 11 00 PM and on at 6 00 AM OFF timer and ON timer can be used in combination The timer of...

Page 19: ...irst 30 minutes of operation is the test run operation This operation is for servicing The indoor fan runs at High speed and thermostat is ON but temperature control does not work After 30 minutes of test run operation the system shifts to EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med All protective operations such as the coil frost prevention works even in em...

Page 20: ... 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 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the t...

Page 21: ...bnormal point with the indoor unit failure mode table 10 2 4 Make sure to check at least two consecutive blinking cycles W2 Turn ON the power supply Preparation of the remote controller 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button 2 First release RESET button And release the other two buttons after all LCD in operati...

Page 22: ... table 10 2 5 Make sure to check at least two consecutive blinking cycles W2 Release the failure mode recall function according to the left mentioned procedure Confirm that the remote controller is in the failure mode recall function The plasma electrode unit might be abnormal Confirm if plasma electrode unit is abnormal according to the following procedures ON OFF Beeps Repeated cycle Repeated cy...

Page 23: ... Correspondence Abnormal point Failure mode Condition 5 PLASMA operation failure mode table 5 time flash The voltage between CN1 3 and 2 GND on the PLASMA POWER P C board rises above the normal voltage value 3 V 4 time flash PLASMA DEODORIZING The voltage between CN1 3 and 2 GND on the PLASMA POWER P C board falls significantly 0 4 V 0 5 ms 3 time flash Refer to 10 6 F Check of PLASMA operation Ab...

Page 24: ...OWER lamp 5 time flash Cause Outdoor unit Outdoor power system abnormality POWER lamp 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit POWER lamp 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 10 6 D How to check of miswiring and serial signal error All lamps Flash on and off at 0 5 second intervals Cause Indoor unit The horizontal vane is not insta...

Page 25: ...2 5 second OFF The rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 10 6 A Check of indoor fan motor Indoor unit and outdoor unit do not operate POWER lamp flashes 5 time flash 2 5 second OFF POWER lamp flashes 6 time flash 2 5 second OFF Other abnormality An abnormality other than above mentioned is detected Check the stop valve Confirm the abnormality ...

Page 26: ...tting Outdoor unit operates but indoor unit does not operate The operation mode of the each indoor unit is differently set to COOL includes DRY and HEAT at the same time the operation mode of the indoor unit that has operated at first has the priority Unify the operation mode Refer to outdoor unit service manual 2 5 second OFF POWER lamp is lighted AREA lamps flash AREA R POWER CLEAN PLASMA L No 1...

Page 27: ...otor MT Normal Measure the resistance between the terminals with a tester Part temperature 10 30 C i see Sensor RR Cover the i see Sensor with black vinyl tape Then turn ON the power supply i see Sensor is energized Measure the voltage between connector terminals of i see Sensor with a tester Part temperature 10 40 C 282 306 Normal range 2 GND 4 1 2 GND 1 874 3 387 VDC 1 010 1 420 VDC i see Sensor...

Page 28: ...follows within 12 seconds after EMERGENCY OPERATION switch is pressed If more than 12 seconds passes by turn OFF the power supply and turn ON it again then measure the voltage w 1 Measure the voltage between CN211 1 and 3 2 Measure the voltage between CN211 5 and 3 Is there 325 VDC between CN211 1 and 3 and does the voltage between CN211 5 and 3 rise to the range of 3 to 6 VDC within 12 seconds af...

Page 29: ... range of 1 m Replace the indoor electronic control P C board including the receiver Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving part Press OPERATE STOP ON OFF button on the remote controller Is LCD display on the remote con troller visible Remove the batteries then set them back and press RESET button Refer to 10 1 4 Check if the unit operates wi...

Page 30: ... fan motor connector Short open circuit Replace the indoor fan motor Short open circuit Replace the horizontal vane motor the vertical vane motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 Are the varistor NR11 burnt and the fuse F11 blown Be ...

Page 31: ...ore if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 and S3 W1 B Turn ON the power supply Check the wiring Correct them Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3 Confirmation of serial signal Is there ra...

Page 32: ...ion refer to 10 2 3 If it goes normal without turning OFF and ON PLASMA lamp doesn t go OFF High voltage approx 4 4 kV is generated during PLASMA operation Pay careful attention and never touch PLASMA ELECTRODE UNIT and the high voltage lead part red wire Yes No OFF PLASMA operation Continuously blinking Does PLASMA lamp flash 2 time with unit stopping Turn ON the power supply Replace the indoor e...

Page 33: ...noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring earth wire antennas wiring from antennas receiver 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then tu...

Page 34: ...l thermistor RT12 RT13 CN112 Timer short mode point JPG JPS Refer to 8 1 SW P C Board i see Sensor CN110 Fuse F11 Vertical vanes CN151 Plasma electrode unit CN1T1 CN2011 Used for check of con ducting of thermal fuse Interlock switch Fan CN1R1 6 0 or 15 VDC 5 3 6 VDC 415 VDC 3 Fiducial terminal of cathode side on measur ing high voltage DC 1325 VDC Cement resistor R111 Indoor fan motor CN211 Emerge...

Page 35: ...2 Power monitor receiver P C board 35 3DC 2 5 V during PLASMA DEODORIZING operation 1DC 12 5 V during PLASMA DEODORIZING operation 2GND CN1 4 Plasma power P C board 3 Monitor P C board ...

Page 36: ...eck the shape of the terminal before detaching Terminal with locking mechanism Detaching points Connector Sleeve Locking lever MSZ FD25VA MSZ FD25VAS MSZ FD35VA MSZ FD35VAS OPERATING PROCEDURE PHOTOS Photo 1 1 Removing the panel 1 Press and unlock the knobs on both sides of the front panel and lift the front panel until it is level Pull the hinges forward to remove the front panel 2 Remove the hor...

Page 37: ... Photo 5 8 Open the rear cover of the power monitor receiver P C board holder and pull out the power monitor receiver P C board 9 Open the sensor holder and pull out the SW P C board 10 Pull the electronic control P C board slightly toward you from the electrical box and disconnect TAB3 and all the connectors on the electronic control P C board 11 Pull out the electronic control P C board from the...

Page 38: ...C board holder See Photo 4 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the interlock switch Be sure to assemble the i see Sensor in the correct position Photo 6 Interlock switch Screws of the interlock switch 5 Removing the vertical vane motor unit 1 Remove the nozzle assembly Refer to 4 2 Remove the crank of the vertical vane motor unit from the arm ...

Page 39: ...tor bed See Photo 10 5 Loosen the screw fixing the line flow fan See Photo 11 6 Remove the motor bed together with fan motor and motor band 7 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchang er w Install the indoor coil thermistor RT12 in its former posi tion when assembling it Refer to Photo 13 9 Remo...

Page 40: ...ARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN C C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Aug 2007 No OBH488 6 Made in Japan New publication effective Aug 2007 Specifications subject to change without notice ...

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