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Old 10-08-2011, 12:47 PM   #1
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Heat Pump AC Freezing Up


I have a thru the wall AC and heater unit, the kind that are in motel rooms. It is a heat pump system. The unit was on AC low for 2 days and froze up. What could cause this?
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Tim

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Old 10-08-2011, 03:35 PM   #2
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Heat Pump AC Freezing Up


A leak somewhere.

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Old 10-08-2011, 06:47 PM   #3
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Heat Pump AC Freezing Up


A freeze up comes from having low air flow across the coil, or a refrigerant leak.
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Old 10-08-2011, 07:42 PM   #4
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Heat Pump AC Freezing Up


How cold was the room and the outdoor temp during these 2 days?
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Old 10-09-2011, 09:27 AM   #5
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Heat Pump AC Freezing Up


The day time outside temp was 80 and the room temp before the unit froze up was about 72
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Old 10-09-2011, 12:42 PM   #6
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Heat Pump AC Freezing Up


Dirty air filter, coil, or low on charge.

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