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The unit is freezing up. i have an outside unit and i'm trying to pull heat.

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That indicates one of three things.

1) Lack of airflow
2) Improper refrigerant charge
3) defrost malfunction


1) Make sure the outdoor coil is clean, and the fan is operating properly at the right speed.

2) IF you are certified, check the refrigerant level.

3) If the unit simply will not go into defrost at all, then the sensor or the defrost board is bad. If it goes into defrost too infrequently, the timing should be adjusted. If it goers into defrost repeatedly and quite often, and the ice build up is simply more than the defrost cycle can handle, look to problems 1 and 2.

Posted on Feb 06, 2010

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