Question about Mitsubishi MS17TN Air Conditioner

1 Answer

A/c shuts down after about 30 seconds

This is a Mitsubishi mini-split heat pump. Today it was 62dgrees inside this room, 65 degrees outside. When in cooling set at 59 degrees the heatpump would operate for about 30 seconds and shut down. When in heat it would operate normally without shuting off. In cooling the suction pressure was about 50psi. The smaller line is also not insulated . The suction line is coming back cold. Is ther a problem or is the cooler temps causing this by a sensor or something. I saw no low or high pressure switches. Thanks Bill Pugh

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

Sounds to me either a low refrigerant charge or low air volume over the evap coil (inside). There is a sencer for temps outside maybe it's tripping out on that.

Posted on Nov 10, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

The unit is on Heat, Fan Auto it's 36 degrees outside, Thermostate set on 73 Actual temp inside 70. Unit runs continuously. How can I get more heat. I tried Emergency heat and that doesn't help.


Have you cleaned the air return filters ? Wash them, don't vacuum or brush them. It damages the filter screen. Sometimes a thermostat will be out by a few degrees. If the filters are clean, try turning the temp down a bit to 65 degrees and see if the air con shuts down. ( If your room temp is showing 70, it should switch off the machine) If it doesn't turn off, keep reducing the temp by 5 degrees at a time and wait a few minutes each movement to see if and when it shuts down. If the machine keeps running, I would suggest your thermostat is shot and you will need a new one.

Jan 04, 2016 | Air Conditioners

1 Answer

Comfort star


Make sure the indoor filters are clean. The outside unit will continue to run until the indoor reaches the temperature you have selected. Dirty filters can throw the temperature out. Its common for outdoor units to freeze up when on heating mode if the ambient air temperature is below 5 degrees Celcius.. The machine should however, defrost itself. There could be a problem with one of the pipe or air sensors on the outdoor unit.

Feb 23, 2014 | ComfortStar CHH012CD-13B Wall Mounted Mini...

1 Answer

Outside unit freezing up and not heating up room inside


Check the defrost board in the outdoor unit... it should have a wire coming off pins that are stamped 30, 60, or 90. If the wire is on 90, then try setting it to 60 or 30. This just enables the defrost board to check the freezestat in minutes...the shorter amount of time, the less likely the unit will freeze up.

Dec 16, 2013 | Soleus Ductless Mini Split 9000 A/c...

1 Answer

Mr. Slim aint cool!


Unit short of refrigerant or outside condenser very dirty. Clean outside thoroughly and make sure there is plenty of warmth coming from it when working.

Jul 07, 2012 | Mitsubishi MSZ-D30NA Mr. Slim Wall Heat...

1 Answer

I have a 18000btu LG mini split heat pump installed about 1 year ago in vacation home. In heat mode the unit cycles on and off when room temp is within 2-3 degrees of set point. Cycle on time varies...


Hello.I think they are on to something with shortcycling on temp sensor.I think it should be sampling the return air instead of (inside coils ?).A 2*f dead band use to be built in (factory installed) to thermostats to prevent on/off, but not sure in this case.Try a new sensor location(return air) and see if anything changes.

Oct 26, 2010 | LG LS-L1210CL Mini Split Air Conditioner

1 Answer

My daughter has Mitsubishi split type air conditioner, model MXZ-2A20NA. The problem is that one of the unit puts out more cold air than in called for on the remote resulting in a room temperature that...


Hi,
The best thing for you to do is to call Mitsubishi Tech. Support directly..they are first class and will probably know exactly what the issue is...

For technical application questions, please call:
Mr. Slim: 1-800-433-4822 (press option #3).

heatman101

Aug 26, 2010 | Mitsubishi Air Conditioners

2 Answers

WE have Amcoraire Mini split unit heat pumps. One is


P 4 code means problem with the outdoor unit, Most likely low on refrigerant. Check all copper pipe connections for leaks first, then add refrigerant after checking pressures.

Jan 17, 2010 | AmcorAire UCHW-H12AF2 Split System Air...

1 Answer

Room at 84. unit set at 65. outside is 94 degrees.


I brows the web to see the specs of your unit.In that case the unit cannot cool down the room temperature, you must consider the following:The volune of the room, it might be exceeded the specified capacity, the thermal isolation of the room, must be shield from leaks,and the materials used,the absorption of the matterial at first operation, the materials around the area will absorb coolness prior to room air, and the ambient temperature outside may affect the performance of the system,If too hot outside put a better thermal isolation inside.that helps? need thumbs up... sams_Ew0rks**

Sep 02, 2009 | DeLonghi CF210 Portable Air Conditioner

2 Answers

Aou18c1 not shutting off


Fujitsu, Mitsubishi, Sanyo mini-split indoor fan motors operate continuoulsy. The room-temperature sensor is inside the unit, so the fan motor needs to circulate air continuouly to sense room-air temperature. This is normal operation.

Sep 12, 2008 | Fujitsu 18C1 Air Conditioner

Not finding what you are looking for?
Mitsubishi MS17TN Air Conditioner Logo

316 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Air Conditioners Experts

D. E. Hev

Level 3 Expert

1059 Answers

yadayada
yadayada

Level 3 Expert

61168 Answers

MightyMikeJr

Level 3 Expert

347 Answers

Are you a Mitsubishi Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...