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This is a common problem with an air conditioner or dehumidifier. If
ice is forming that means that the temperature in the coils has to be
at or below freezing. Rather than being short of gas your system is
probably doing what it should but because of a high relative humidity
ice is forming. Many systems have sensors that adjust the system set
point so that the compressor operation is controlled to prevent icing.
I suggest finding out if your system has such a control system and if
it%26#39;s operating correctly
Though I beleive that your question has most probably been answered ,
The most probable reason for an air conditioner to operate normally at
higher temps, but freeze at lower temps is that the system is over
charged ( how ever a lack of refrigerant can cause symptom) and
excluding air flow problems --such as a door not being on the blower
compartment or pluged coil---- The correct method for chargeing to be
used should be the superheat method-- if your serviceman doesn%26#39;t know
what super heat is you need to get some one else. If an AC system is
charged to cool more than (a suggested) 20 degree split(the difference
of air coming into system, and air going out) at high temperatures,
then it will freeze at lower temps. in regards to darren, No Way----
If a system is properly charged-- also humidty is removed interiorly
by condensation, thus the hose to the drain, humidity only lowers
efficiency--- most home ac systems don%26#39;t have an econimizer--- Never
the less your problem is most likely related to charge, or airflow- if
it is not airflow you are most probably overcharged-----check with a
professional HVAC technition and remember super heat. thanks E-mail me
gtrdddy@aol.com.
P%26gt;S%26gt; Koz answer is in reference to Ice on the condensor---which is the
outdoor coil---- In my answer it is in regards to the inside-- a good
first looking spot. tks. call a service tech
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