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Brisk Air Conditioners
Why do I see a Frost Formation On the Outdoor Coil While Heating?
Operation at low outdoor temperatures causes low coil temperatures. This can result in ice forming on the outdoor coil in certain conditions.
This is indicated by reduced heat output and could fully stop fan rotation in extreme conditions. To avoid this, the system controls turn off the compressor if outdoor temperature drops below 42° F and returns heating when the temperature raises 5° F.