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Posted on Nov 13, 2007

My ac unit

Why does my ac freeze up no matter what temp it is set on?

  • Anonymous May 10, 2009

    ac compresson kicking off,and bussing noise coming from unit

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2 Answers

Anonymous

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  • Posted on Nov 13, 2007
Anonymous
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Air conditioners freeze up for one of 2 reasons, #1 restricted air flow, is the filter, /orthe evaporator (cool) coil clean?
#2 it is low on freon, causing the coils to be colder than they should be.

A

Anonymous

Well there are a couple of other reasons for a "freezing" a/c unit, and that would be intermittent indoor blower motor failure, which is in a way could be considered restricted air flow.

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TX_AC_Man

Patrick Worley

  • 107 Answers
  • Posted on Sep 01, 2010

SOURCE: ac unit only blows out

This sounds like a split system and not a window unit ? First check the outside unit known as the condenser and make sure it is running correctly by --- Check that fan is running on outdoor unit and listen to see if the compressor is running. If neither of these are running then it can be a loss of control voltage to the contactor, bad contactor or even bad capacitor. If nothing is running then turn off the power by using diconnect next to unit....then remove the side or corner panel that has access to the control compartment . Visually check that the contactor is pulled in so that the center section is pulled in to make a complete contact across the terminals for power to flow... look at capacitor and see if it is swollen on the top and if it is swollen then it must be replaced with exact matching numbers from an electrical parts or motor dealer. If everything still looks ok then you will need to contact a local company to troubleshoot the unit further.

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If i set the temp to low on my window air conditioner can it cause the unit to freeze up

Under some conditions, it could freeze up. High humidity levels can cause the coils to freeze. Not cleaning the air intake filter regularly, can also cause the coils to freeze. However, most window units can not be set below 65 degrees. But, in high humidity, it could freeze at that temp.

If you want to avoid the possibility of the coils freezing, operate a ceiling fan or other small fan as fast as comfortable. This keeps the cool air moving a generates a wind chill that fools your body into thinking it's cooler than it really is. Doing this will keep you from having to turn the AC way down and thus, save on energy cost.

I hope this has helped you and thanks for choosing FixYa.
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Double check to see that you do have in fact, the correct thermostat. I have found a chart that shows that the differential is all over the board. There is a way to adjust these thermostats but is very time consuming and if you are not a refrigeration tech, you may struggle with the procedure.
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Most freezing is caused low refrigerant or temp control will not shut off unit if there is no humidity problem.
one or the other can be checked by an refrigeration tech.
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