Be sure the thermostat is switched to Cool , the
Fan is switched to Auto, and adjusted low enough to be turning on.
Be sure the filter is clean.
There are several areas which could cause your system to freeze up.
Most of which will need professional service. Making sure the filter
is clean and the air flow is not restricted is about the only items
you can check yourself. Other than that, you will need to call your
Service
Company.
Low Refrigerant: In most cases, this is caused by a leak in the refrigerant
lines. Weak solder joints, friction from piping rubbing or vibrating
against an object, leaking valves or loose fittings. Depending on
the age of the system and the nature and location of the leak is the
determining factor on having it repaired or replaced.
Dirty Evaporator Coils: Over the years, the Evaporator coils will
become dirty. When this happens, the results are the same as a dirty
filter. Gradually you will loose air flow, slow enough you probably
would not realize it until it just freezes up or it is not cooling
as well as it did last year. Unfortunately, you will need service
for this one. Cleaning the coils can be difficult and may need to
be removed to be done properly. Chemicals and a lot of rinsing
will be necessary.
Defective Blower Motor or Relay: A Blower motor not running or at
the proper speed will cause freezing. It could also be intermittent.
Starting at full speed and slowing down after it heats up. Or a relay
could cause it to start one time and not the next. Either case you
will need Service.
If you find your system was freezing because of a dirty filter, after
replacing or cleaning the filter you can speed up thawing the ice
by turning the system off and turning the fan on. If you have a heat
pump, switch the system to heat until the ice has melted. After
the ice has melted, switch everything back to normal and switch to
cool. If this has not answered your question, you may need to
call for service.
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