Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Hot air coming out of ac

Unit 3 years old - not used in two years - only hot air comes out in house - unit outside seems normally runs etc... 
heating works fine! 
thoughts????

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The workings of split units can be difficult to repair. I would have a professional repairman look at it.

Posted on May 08, 2009

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I am not understanding exactly what is happening with your unit. You say it only runs for 4 hours a day and then say that after 4 hours the outside unit shut off. But you don't describe the condition of the outside unit! Is there ice on your outside unit after it runs for four hours or is it so hot that the housing would fry an egg? Since it works for four hours and then stops working, I would guess that ice forms on the condenser grill which tells the thermostat that your air is much colder than it actually is. Then it takes time for the ice to melt off again. Am I close? If so this condition is usually caused by your unit being low on freon making everything work harder. But it could also mean that you have a leak in the system somewhere. But it shouldn't be much of a leak or it wouldn't run for the 4 hours.
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