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Air conditioner freezing up

I see ice in my unit when i remove the filter. have tried leaving unit off until ice was gone, cleaned air filter, put back on after ice was gone. it still formed ice again. any suggestions?

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Re: air conditioner freezing up

Your unit is low on freon. Take the unit to a service facility & have it recharged & the leak repaired. Note that ice formation may normal if the outside temperature is below 45-50F. If you must use it in the meantime, leaving the unit on fan only will melt the ice much faster.

Posted on Jul 17, 2007

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What is the problem when an air conditioner begins to freeze up?

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If air filter and indoor coil are clean may be low on freon. Blower wheels seldom get dirty on window units. Pull unit from window and clean both coils with a water hose. Careful not to get any electrical wet. Let dry for a while and reinstall. If it continues to freeze its a freon problem most the time.

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There is a wall of ice inside the air conditioner behind the filter.

If you haven't already, tunr the unit OFF & unplug it. Allow to totally thaw. Then remove the air intake filter and clean it thoroughly. It is probably clogged, which is what caused the unit to freeze up. But, do not attempt this, until the unit has totally thawed.

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After around an hour or so it starts to ice up and stops blowing cold

The problem you're having is generally caused by 2 things:

1. The air intake filter needs to be removed and cleaned.
2. Overly high humidity in your area.

Keeping the filter clean, will help the unit to move more air and slow the freezing process down, to where it will only be frost. Which is normal.

If the unit has not thawed, wait until it does before removing the filter to clean it. Be sure to turn the unit OFF & unplug it, before removing the filter.

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Hi, when the unit freezes up, it is either low on freon, a plugged a/c filter, or the evaporator coil is dirty and will need to be cleaned. When the evap. coil freezes up, the blower motor can't blow air through the coil. Check the filter, and behind the filter to see if the coil is dirty, just remove the screws to excess the evap. coil on this unit. Make sure the blower motor is running up to speed also. You will know. If the coil is dirty, try and clean it the best you can and replace the filter. If it continues to ice, you will need to have the freon level checked> These are the # 1 causes of coils icing up. Please let me know how it turns out.
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