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A dehumidifier is a refrigeration system just like you home fridge or an air conditioner. The evaporator coil cools the air as the air is blown through the coil. This lowers the temperature of the air and thus decreases it's ability to hold water vapour. The water vapour condenses in the cooler air and drops out lowering the overall humidify of the air. When the air flow is restricted or too cool or the humidity is extremely high the water is not carried off of the coil and it condenses on the coil and then if the coil is cool enough the water will freeze forming ice. It is a simple matter to fix, just shut off your dehumidifier, let the ice melt and then put it back in service again.

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Q: What causes a dehumidifier to freeze up?
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Do I need to add anything besides water to a Dehumidifier?

Only water should be put into a dehumidifier. If you try to add anything else to it, you might end up ruining the dehumidifier.


Why does low freon cause ice formation on a dehumidifier?

There is ice on the dehumidifier coil because it is low on freon. When there is not enough freon in a refrigeration system the inlet pressure to the compressor is lower than design due to lack of gas. Because it is at a low pressure the freon is very cold. This causes freeze-up. If You were to add freon to the running dehumidifier you would see the cold coil thaw, first at the end closest to the compressor suction and then work toward the other end of the coil. When the thaw reaches the other end of the cold coil it has enough freon and no more need be added. Tim Koller


What causes the evaporator to freeze up?

;slow blower;low on freon;dirty filter.


What causes a dehumidifier to freeze?

A dehumidifier is a refrigeration system just like you home fridge or an air conditioner. The evaporator coil cools the air as the air is blown through the coil. This lowers the temperature of the air and thus decreases it's ability to hold water vapour. The water vapour condenses in the cooler air and drops out lowering the overall humidify of the air. When the air flow is restricted or too cool or the humidity is extremely high the water is not carried off of the coil and it condenses on the coil and then if the coil is cool enough the water will freeze forming ice. It is a simple matter to fix, just shut off your dehumidifier, let the ice melt and then put it back in service again.


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The dehumidifier removes excess humidity from the air.


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Should you run dehumidifier and central air at same time?

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