My dad owned an A/C company since 1968 until he died a few years ago. I worked for him summers in high school and college. I'm by no means an expert but there are a few things that could cause it to freeze.
1. Check air flow: Is there an obstruction of anykind? If the filter is dirty that will do it every time. If you have every run it without a filter the evaporator coil needs to be cleaned. They must have a filter. If you have pet , cat or dog, that hair gets everywhere. Just running it for a few days without a filter will do it, and it will not fix itself.
2. Your fan is running at a speed that is not allowing the condensation to drain and, building up causing low airflow - freezing.
3. Is your condensation drain free from debris? Generally they will leak before they freeze, unless the water has no where to go.
4. Hopefully not this: Low on Freon, Freon changes from a liquid to a gas then is compressed back down to a gas. When that happens it's a certain pressure. If the pressure varies the temperature will drop causing the coil to freeze. If it has been doing the exact same thing for a while, like since it was new, it might not have a leak, just may be under charged.
if it is low on Freon and it's new, take it to the deal or get warranty work immediately. Just make sure it's thawed out before you get someone to look at it. They can't do much for you if it's frozen like a brick. Freon is not like gas in your car. It will not go anywhere, unless you have a leak. If you keep filling it, it's just like a band-aid. Plus A/C companies are not supposed to keep filling leaking systems...EPA stuff.
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