We encountered a similar problem in our home in SC and the Technician found a leak in the freon line from the outside unit to the condenser in the attic. The leak caused the entire unit in the attic to freeze up as well as the outside unit. You may not have a leak, however depending on the age of your unit, you may need a recharge.
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Originally Posted by geurd
I have a heat pump that has been freezing up in the evenings. The entire freon lines are covered with ice usually in the evenings around 8:30 or 9pm just after dark. I have cleaned the coil on the inside (in the attic) and on the outside unit, and replaced the filter. I also checked the coolant pressure 70 psi on the low side and 225 psi on the high side. After I notice the temp increase in the house and that the heat pump is frozen, I turn the unit off for 30 minutes and let it thaw and it works perfectly for until the next night.
The house is about 1500 sq ft on a slab, built 4 years ago. I live in Alabama, and when I have been having problems the outside temp as been in the high 80s to low 90s during the day. On cooler days (high in low to mid 80s) I have not been having the problem.
Does anyone have any ideas why tis may be happening?
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