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Mitsubishi Electric MSZ-AP15VF, Service Manual, Page: 23 / 34

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Mitsubishi Electric MSZ-AP15VF Service Manual Download Page 23

23

OPERATION INDICATOR

  

No. 

Abnormal 

point 

Operation indicator lamp 

Symptom 

Condition 

Remedy

1

MXZ type 

Operation 
mode 
setting

Left lamp lights and lower lamp fl ashes.

  

                       

2.5-second OFF

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 fi rst has 
the priority.

• Unify the operation mode.

Refer to outdoor unit service 
manual.

10-5. TROUBLE CRITERION OF MAIN PARTS

MSZ-AP15VF  MSZ-AP20VF

Part name 

Check method and criterion

Figure 

Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)

Measure the resistance with a tester.

Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control 
P.C. board", for the chart of thermistor.

Indoor fan motor (MF)

Refer to 10-6.  "Check of indoor fan motor."

Vane motor (MV)

Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)

Color of the lead wire

Normal

RED - YLW

223 - 268 

Ω

YLW

YLW
RED

YLW

YLW

ROTOR

OBH799

Summary of Contents for MSZ-AP15VF

Page 1: ...723 No OBH799 PARTS CATALOG OBB799 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND FUNCTIONS 4 3 SPECIFICATION 5 4 NOISE CRITERIA CURVES 6 5 OUTLINES AND DIMENSIONS 7 6 WIRING DIAGRAM 8 7 REFRIGERANT SYSTEM DIAGRAM 9 8 SERVICE FUNCTIONS 10 9 MICROPROCESSOR CONTROL 11 10 TROUBLESHOOTING 18 11 DISASSEMBLY INSTRUCTIONS 30 Models MSZ AP15VF E1 ER1 MSZ AP20VF E1 ER1 ...

Page 2: ...service Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water int...

Page 3: ...3 TECHNICAL CHANGES 1 MSZ AP15VF E1 MSZ AP20VF E1 MSZ AP15VF ER1 MSZ AP20VF ER1 1 New model OBH799 ...

Page 4: ...sed for left or left rear piping 1 Battery AAA for remote controller 2 MSZ AP15VF MSZ AP20VF PART NAMES AND FUNCTIONS 2 Remote controller Operation indicator lamp Remote control receiving section Horizontal vane Air outlet Air lter Heat exchanger Emergency operation switch Front panel Spec name plate Air inlet OBH799 ...

Page 5: ...t 21 Heating Super High dB A 40 42 High 35 Med 30 Low 26 Silent 21 Fan speed Cooling Super High rpm 1 430 1 530 High 1 250 Med 1 080 Low 940 Silent 860 Heating Super High rpm 1 430 1 530 High 1 290 Med 1 100 Low 990 Silent 870 Fan speed regulator 5 Remote controller model SG18A NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry...

Page 6: ...G 42 42 NC 10 MSZ AP20VF Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C INDOOR UNIT WALL MICROPHONE 0 8m 1m 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 FUNCTION SPL dB A LINE Super High FAN SP...

Page 7: ... part ø16 O D 193 60 19 155 295 167 5 187 5 209 21 5 41 3 299 5 145 145 335 45 166 5 208 61 78 42 740 760 178 5 250 335 5 14 5 51 100 11 96 166 80 5 50 10 66 505 189 INDOOR UNIT INSTALLATION PLATE 11 26 OBLONG HOLE 11 20 OBLONG HOLE WALL HOLEø65 IN CASE OF LEFT LEFT BACK OR LEFT UNDER PIPING USING SPACER MIN 120 5mm MIN 44 5mm MIN 14mm MIN 30mm MIN 20mm AIR IN PIPING DRAIN HOSE INSTALLATION PLATE ...

Page 8: ...8 MSZ AP15VF MSZ AP20VF WIRING DIAGRAM 6 OBH799 ...

Page 9: ...connection Refrigerant pipe ø9 52 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Unit mm MSZ AP15VF MSZ AP20VF REFRIGERANT SYSTEM DIAGRAM 7 OBH799 ...

Page 10: ... 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 However it takes at least 3 minutes for the compressor to start running How to ...

Page 11: ... CONTROL button OPERATION SELECT button ECONO COOL button CLOCK SET button WEEKLY TIMER set button TIME TIMER set buttons FORWARD button BACKWARD button RESET button i save button VANE CONTROL button Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of the indication Indication Op...

Page 12: ...s 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 pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when th...

Page 13: ... flashes as shown in the figure below In this case please set all the indoor units to the same operation mode When indoor unit starts the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 min utes to blow out the warm air In the heating operation though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard they are ...

Page 14: ...s a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL VANE CONTROL button 9 7 TIMER OPERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so s...

Page 15: ...ON A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the weekly timer is set temperat...

Page 16: ...setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit 5 Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer settin...

Page 17: ...not press EMERGENCY OPERATION switch during normal operation Operation mode COOL HEAT Set temperature 24 C Fan speed Medium Horizontal vane Auto The operation mode is indicated by the Operation Indicator lamp as following Operation Indicator lamp EMERGENCY COOL EMERGENCY HEAT STOP Lit Not lit 9 9 i save OPERATION 1 How to set i save operation 1 Press STOP OPERATE OFF ON button 2 Select COOL HEAT o...

Page 18: ...he cabinet the top panel and the P C board 3 When removing the P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sur...

Page 19: ...table Refer to 10 2 2 Make sure to check at least 2 consecutive blinking cycles 2 Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table Refer to outdoor u...

Page 20: ... of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time flash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted during the 12 seconds the indoor fan opera...

Page 21: ...lash on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of se rial signal Left lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor Left lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Left lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system Left lamp 5 time flash Cause Outdoor unit Outdoor powe...

Page 22: ...tronic control P C board Replace the indoor electronic control P C board 5 Outdoor power sys tem Left lamp flashes 5 time flash 2 5 second OFF It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6 Out...

Page 23: ...priority Unify the operation mode Refer to outdoor unit service manual 10 5 TROUBLE CRITERION OF MAIN PARTS MSZ AP15VF MSZ AP20VF Part name Check method and criterion Figure Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Measure the resistance with a tester Refer to 10 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan mot...

Page 24: ...ween CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 2 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the ind...

Page 25: ...CN301 No 2 and No 3 when the remote controller button is pressed Is the voltage approximately 4 V DC 5 V DC No Replace the indoor electronic control P C board Replace the receiver P C board Is a signal transmitted from a remote controller of a different device Yes Stop the transmission of signal between the different device and its remote controller No 2 1 If the inverter fluorescent light is turn...

Page 26: ...Measure the resistance between CN211 and of indoor fan motor connector 1 2 Yes Is the resistance 1MΩ or more Replace the fuse F11 and the indoor fan motor 3 No Replace the fuse F11 3 Measure the resistance of resis tor R111 on the indoor electronic control P C board Is the resistance of resistor R111 approxi mately 4 Ω No Replace the indoor electronic control P C board and the indoor fan motor Rep...

Page 27: ...CATOR lamp light up Confirmation of the power to the indoor unit Press EMERGENCY OPERATION switch once Check the power supply A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and S3 1 B Turn ON the power supply Check the wiring Correct them Turn OFF the power supply Remove the bridge between the outdoor terminal...

Page 28: ...he installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outd...

Page 29: ...sable Auto restart function solder the Jumper wire to JR07 Refer to 8 3 MSZ AP15VF MSZ AP20VF Indoor electronic control P C board 10 7 TEST POINT DIAGRAM AND VOLTAGE Display P C board Receiver P C board SW P C board Resistor R111 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Temperature C Resistance kΩ Fuse F11 T3 15AL250V Varistor NR11 230 V AC Emergency operation switch E O S...

Page 30: ...ng lever or not 2 The terminal with this connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Screws of the panel Front panel Horizontal vanes Detaching method of the terminal with locking mechanism The terminal which has the locking mechanism can be detache...

Page 31: ...ect the following connectors on the electronic control P C board CN211 Indoor fan motor CN201 Terminal block CN112 Indoor coil thermistor CN151 Horizontal vane motor CN109 Receiver P C board 9 Pull out the electronic control P C board from the electrical box 10 Remove the earth wire connected to the indoor elec tronic control P C board from the electrical box Photo 3 NOTE MSZ AP15VF and MSZ AP20VF...

Page 32: ...fer to 1 and the corner box 2 Remove the V A clamp Photo 2 3 Remove the electrical cover Photo 3 4 Disconnect the following connector on the electronic control P C board CN151 Horizontal vane motor 5 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screw of the lead cover and re...

Page 33: ...ve it 8 Remove the motor bed together with fan motor and motor band 9 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 10 Remove the screws fixing the left side of the heat exchanger Photo 10 11 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 mm gap is provided between the ...

Page 34: ...o avoid loss and accidental falling of the clip shape part inside the unit Mount the clip shape part on the marked position Do not pull the lead wire when removing the indoor coil thermistor Holder shape Clip shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check ...

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