Dehumidifier: frosts immediately upon startup...

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Old 09-25-17, 08:08 AM
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Dehumidifier: frosts immediately upon startup...

I have a Frigidaire dehumidifier that is less than 2 years old. It seems to be running more than it used to and it's running more than it's resting.

Immediately after starting, the coils start to frost starting from the bottom up. I can watch as the frosting progresses left to right, right to left.

There are no unusual sound from the unit - fan and compressor sound fine. The unit has an auto-defrost and that is working properly. The defrost engages after 25-30% of the coils are frosted and the coils defrost within 15 seconds.

The filter is clean and the coils are clean. Ambient temp is 74F and I keep the unit set at 55% RH. The home is a weekend home, so it's closed up much of the time - meaning it's not in a situation with doors open a lot.

I believe this system is sealed and non-serviceable.

Do I have a bad unit due to low refrigerant?

Thanks.
 
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Old 09-25-17, 08:51 AM
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Check to see if the fan blades are clean.
 
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Old 09-25-17, 09:19 AM
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Originally Posted by skaggsje View Post
Check to see if the fan blades are clean.
Yes, the fan blades are clean.
 
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Old 09-25-17, 09:40 AM
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Are you getting any frost on the pipes around the compressor ?
 
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Old 09-25-17, 04:34 PM
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When the coil frosts up starting at one side, it's because it's starved for refrigerant, most likely due to a leak.

frosting up evenly is different - it occurs when the load on the coil is very low due to dirt/poor airflow or low ambient temperature.

You should check to see if this unit has a sealed system warranty. it could be 5 years.

These units can be serviced/fixed if you have the tools, licenses and knowledge. There are fittings that tap the refrigerant line - the fitting is put on and then gauges attached.

if you need to go to a pro the labour cost will exceed the value of the unit.
 
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