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Mitsubishi Air Conditioner Troubleshooting and Repair

Since the introduction of mini split ductless air conditioning one of the leaders has been Mitsubishi. There are now many of these units in service. Even though these Air Conditioners are extremely reliable, there are problems with them from time to time.
When these problems arise you need to know where to go to get online manuals and troubleshooting guides.

As a professional the place that I go is to the Mitsubishi website: www.mrslim.com
Here you can find a ton of information for the homeowner as well as for the professional.
The nice part about this site is that you do not need a password to get into the professional side of this site. I there are all of the resources that the professionals use, and they are available to everyone.

If you want to shortcut right to these resources just go here:
http://www.mitsubishipro.com/en/professional/resources-and-tools

From the drops down menu you can access all of the manuals that are available for any model. Then you can have full access to troubleshooting guides. They are simple and easy to understand. Many issues can be figured out and fixed by a handy homeowner.

Take the time to cruise around and look at all of the materials includes in this site, there are many things that will give you tons of great information about the Mitsubishi line of air conditioners and heat pumps.

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2 Answers

I am not able to get the unit to change from air conditioning to heat


Unfortunately these units are not user fixable , beyond checking for power and checking battery in remote. You would need to call a pro who is able to get service information and has special digital logic meters to diagnose and repair .

Oct 04, 2014 | Mitsubishi MXZ-2B20NA-1 Mr. Slim Dual Zone...

2 Answers

I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

ductless minisplit in old mobile home


ductless mini split units are a very good choice!  they are obviously quieter, more efficient and easier to maintain than window units. the downside is the initial expense of buying the unit, but this is paid back in eletric savings and peace of mind. Good luck Peyton

Mar 07, 2009 | Soleus KFR12GWD 12,000 BTU Heat & Cool...

1 Answer

mini split AC's


they are excellent and very efficient sytems
i have a muti pass ductless in my home and swear by it so much i went to school for them
I am now a mitsubishi cert expert
and cannot sing the praisees high enouhg for the ductless systems

Jun 14, 2008 | GE Quiet-Aire Ductless Mini Split System...

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