Mitsubishi Electric MSZ-LN25VGW - Инструкция по эксплуатации - Страница 17

En-16

Even if these items are checked, when the unit does not recover from the 

trouble, stop using the air conditioner and consult your dealer.

Symptom

Explanation & Check points

Indoor Unit

The unit cannot be operated.

•  Is the breaker turned on?

•  Is the power supply plug connected?

•  Is the ON timer set? 

 Page 12 

The horizontal vane does not 

move.

•  Are  the  horizontal  vane  and  the  vertical  vane 

installed correctly?

•  Is the fan guard deformed? 

•  When  the  breaker  is  turned  on,  the  horizontal 

vanes’ position will be reset in about a minute. 

After the reset has completed, the normal hori-

zontal vanes’ operation resumes. The same is 

true in the emergency cooling operation.

The unit cannot be operated for 

about 3 minutes when restarted.

•  This protects the unit according to instructions 

from the microprocessor. Please wait.

Mist is discharged from the air 

outlet of the indoor unit.

•  The cool air from the unit rapidly cools moisture 

in the air inside the room, and it turns into mist.

The swing operation of the HORI-

ZONTAL VANE is suspended for a 

while, then restarted.

•  This is for the swing operation of the HORIZON-

TAL VANE to be performed normally.

When SWING is selected in 

COOL/DRY/FAN mode, the 

lower horizontal vane does not 

move.

•  It is normal that the lower horizontal vane does 

not  move  when  SWING  is  selected  in  COOL/

DRY/FAN mode.

The airfl ow direction changes 

during operation.

The direction of the horizontal 

vane cannot be adjusted with 

the remote controller.

•  When  the  unit  is  operated  in  COOL  or  DRY 

mode, if the operation continues with air blow-

ing down for 0.5 to 1 hour, the direction of the 

airfl ow  is  automatically  set  to  upward  position 

to prevent water from condensing and dripping.

•  In  the  heating  operation,  if  the  airfl ow  tem-

perature is too low or when defrosting is being 

done,  the  horizontal  vane  is  automatically  set 

to horizontal position.

The operation stops for about 

10 minutes in the heating 

operation.

•  Outdoor unit is in defrost.

  Since  this  is  completed  in  max.  10  minutes, 

please  wait.  (When  the  outside  temperature  is 

too low and humidity is too high, frost is formed.)

The unit starts operation by 

itself when the main power is 

turned on, but hasn’t received 

sign from the remote controller.

•  These  models  are  equipped  with  an  auto 

restart  function.  When  the  main  power  is 

turned  off  without  stopping  the  unit  with  the 

remote  controller  and  is  turned  on  again,  the 

unit starts operation automatically in the same 

mode  as  the  one  set  with  the  remote  control-

ler  just  before  the  shutoff  of  the  main  power. 

Refer to “Auto restart function”. 

 Page 18 

The two horizontal vanes touch 

each other. The horizontal 

vanes are in an abnormal posi-

tion. The horizontal vanes do 

not return to the correct “close 

position”.

Perform one of the following: 

•  Turn off and on the breaker. Make sure the hori-

zontal vanes move to the correct “close position”.

•  Start and stop the emergency cooling operation 

and make sure the horizontal vanes move to the 

correct “close position”.

In  COOL/DRY  mode,  when  the 

room  temperature  reaches  near 

the  set  temperature,  the  outdoor 

unit  stops,  then  the  indoor  unit 

operates at low speed.

•  When the room temperature deviates from the 

set  temperature,  the  indoor  fan  starts  running 

according to the settings on the remote control-

ler.

The indoor unit discolors over 

time.

•  Although plastic turns yellow due to the infl uence 

of  some  factors  such  as  ultraviolet  light  and 

temperature, this has no effect on the product 

functions.

The operation indicator lamp is 

dim. The unit does not beep.

•  Is the NIGHT mode set?

Multi system

The indoor unit which is not 

operating becomes warm and a 

sound, similar to water fl owing, 

is heard from the unit.

•  A small amount of refrigerant continues to fl ow 

into the indoor unit even though it is not operat-

ing.

When heating operation is 

selected, operation does not 

start right away.

•  When operation is started during defrosting of 

outdoor unit is done, it takes a few minutes (max. 

10 minutes) to blow out warm air.

Outdoor Unit

The fan of the outdoor unit does 

not rotate even though the com-

pressor is running. Even if the 

fan starts to rotate, it stops soon.

•  When  the  outside  temperature  is  low  during 

cooling operation, the fan operates intermittently 

to maintain suffi cient cooling capacity.

Water leaks from the outdoor 

unit.

•  During COOL and DRY operations, pipe or pipe 

connecting sections are cooled and this causes 

water to condense.

•  In  the  heating  operation,  water  condensed  on 

the heat exchanger drips down.

•  In the heating operation, the defrosting operation 

makes ice forming on the outdoor unit melt and 

drip down.

White smoke is discharged from 

the outdoor unit.

•  In the heating operation, vapor generated by the 

defrosting operation looks like white smoke.

Symptom

Explanation & Check points

Remote controller

The display on the remote 

controller does not appear or it 

is dim. The indoor unit does not 

respond to the remote control 

signal.

•  Are the batteries exhausted? 

 Page 5 

•  Is  the  polarity  (+,  -)  of  the  batteries  correct?

 Page 5 

•  Are any buttons on the remote controller of other 

electric appliances being pressed?

The operation mode cannot be 

changed.

•  Disable the OPERATION LOCK.

Does not cool or heat

The room cannot be cooled or 

heated suffi ciently.

•  Is the temperature setting appropriate? 

 Page 7 

•  Is  the  fan  setting  appropriate?  Please  change 

fan speed to High or Super High. 

 Page 8 

•  Are the fi lters clean? 

 Page 14 

•  Is the fan or heat exchanger of the indoor unit clean? 

 Page 14 

•  Are there any obstacles blocking the air inlet or 

outlet of the indoor or outdoor unit?

•  Is a window or door open?

•  It  may  take  a  certain  time  to  reach  the  setting 

temperature or may not reach that depending on 

the size of the room, the ambient temperature, 

and the like.

•  Is the NIGHT mode set?

The room cannot be cooled 

suffi ciently.

•  When a ventilation fan or a gas cooker is used 

in a room, the cooling load increases, resulting 

in an insuffi cient cooling effect.

•  When the outside temperature is high, the cooling 

effect may not be suffi cient.

The room cannot be heated 

suffi ciently.

•  When the outside temperature is low, the heating 

effect may not be suffi cient.

Air does not blow out soon in 

the heating operation.

•  Please wait as the unit is preparing to blow out 

warm air.

Airfl ow

The air from the indoor unit 

smells strange.

•  Are the fi lters clean? 

 Page 14 

•  Is  the  fan  or  heat  exchanger  of  the  indoor  unit 

clean? 

 Page 14 

•  The  unit  may  suck  in  an  odor  adhering  to  the 

wall, carpet, furniture, cloth, etc. and blow it out 

with the air.

Sound

Cracking sound is heard.

•  This sound is generated by the expansion/con-

traction of the front panel, etc. due to change in 

temperature.

“Burbling” sound is heard.

•  This  sound  is  heard  when  the  outside  air  is 

absorbed from the drain hose by turning on the 

range hood or the ventilation fan, making water 

fl owing in the drain hose to spout out.

  This  sound  is  also  heard  when  the  outside  air 

blows  into  the  drain  hose  in  case  the  outside 

wind is strong.

Mechanical sound is heard 

from the indoor unit.

•  This is the switching sound in turning on/off the 

fan or the compressor.

The sound of water fl owing is 

heard.

•  This  is  the  sound  of  refrigerant  or  condensed 

water fl owing in the unit.

Hissing sound is sometimes 

heard.

•  This  is  the  sound  when  the  fl ow  of  refrigerant 

inside the unit is changed.

Timer

Weekly timer does not operate 

according to settings.

•  Is the ON/OFF timer set? 

 Page 12 

•  Transmit  the  setting  information  of  the  weekly 

timer  to  the  indoor  unit  again.  When  the  infor-

mation is successfully received, a long beep will 

sound from the indoor unit. If information fails to 

be received, 3 short beeps will be heard. Ensure 

information is successfully received. 

 Page 13 

•  When a power failure occurs and the main power 

turns  off,  the  indoor  unit  built-in  clock  will  be 

incorrect. As a result, the weekly timer may not 

work normally.

  Be  sure  to  place  the  remote  controller  where 

the  signal  can  be  received  by  the  indoor  unit.

 Page 5 

The unit starts/stops the opera-

tion by itself.

•  Is the weekly timer set? 

 Page 13 

Wi-Fi interface

When error occurs during con-

nection setup or operation.

Refer to the SETUP MANUAL.

For  SETUP  MANUAL,  please  go  to  the  website 

below.

http://www.melcloud.com/Support

W

HEN  YOU  THINK  THAT  TROUBLE  HAS  OCCURRED

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2018/01/18   14:21:55