We have a 6 year old Frigidaire upright freezer (around 17 cu ft). It suddenly stopped cooling, even though the compressor was running, and it was producing puddles of water on the floor. I thought it might be just icing up, so I unplugged it for a day and eventually, the dripping stopped. I plugged it back in and it appears to be working normally.

I'm aware that low refrigerant can cause it to ice up. However, it's a totally sealed system, with no connections for testing or refill. Which leaves a number of expensive possibilities if there's still a problem:

  • Fill it up again with food and possibly lose another batch of food.
  • Get it serviced, which would run about half the cost of a new one.
  • Replace it.

So my question is about trying to determine whether there is still a problem.

  • Is it usual or typical for a freezer in normal working condition to build up ice on the coils over time from house humidity, or does that happen only if there's a problem, like low refrigerant?

    I kept it at the maximum cooling setting, which produced a temperature of below minus 10 degrees, which is colder than a normal freezer setting. Could this have contributed to its icing up?

  • If the problem is low refrigerant, best case is that there was always a minute leak and it took 6 years to lose enough to cause this problem. However, that means even if the rate of continual loss is tiny, it's already at a low point, so it would be expected to ice up again.

    If the refrigerant is low enough to cause icing, how fast does that occur? For example, If I just run it empty for awhile to see if it ices up again, what order of magnitude of time would be a reasonable confirmation that it's OK (days, weeks)? Or is that too variable to be a useful test?

  • Is there anything else that can be checked without specialized refrigeration testing and repair equipment that would indicate whether the system is not running normally?

It is probably low on refrigerant because of a leak somewhere in the sealed system. Just because it is a sealed system does not mean it will not leak. During the "normal" building process one of the builders was probably not having a great day (not enough sleep, poor instructions, or too much wine the night before) so he did not do his job correctly. You will have to make a decision to have it serviced of replace it. Most stuff today is made to be replaced not repaired. We now live in a "replace", don't fix society.

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  • Yeah, that's my guess, too. After 6 years, it still has almost enough refrigerant to run, so it must be a molecule-sized leak. There would be no practical way to find it at this point. Replacing the entire sealed system wouldn't be cost effective, so we're buying a new freezer. But for anyone else in a similar situation, any advice you can offer on whether the coils on a freezer in working order can ice up, or any diagnostics other than running it for a few days to see if it fails again? Or maybe confirm that there are no other diagnostics that a homeowner could employ? – fixer1234 Jul 5 '17 at 15:29
  • There is one other possibility that the defrost mechanism or the coils defrost heater is not working. The ice would build up as it normally does but it would not defrost. – d.george Jul 5 '17 at 16:23
  • There's a drain tube below the coil area running to a little collection bucket that uses heat from the compressor to evaporate the water. If that bucket is full, would that be an indicator that the defrosters are working (a way to rule out that possibility)? – fixer1234 Jul 5 '17 at 16:39
  • Also, there are heaters in the side walls to keep ice from building up there. I don't think there are coils on the sides, but the heaters might be interconnected with the coil defrosters. The sides were normally warm all the time. When it initially failed, though, the sides were cold, so at least those heaters weren't working. After I restarted it, the sides were warm even as the interior temperature was going up. Anything diagnostic there? – fixer1234 Jul 5 '17 at 16:49
  • The defroster was something I hadn't thought of. +1 – fixer1234 Jul 5 '17 at 17:00

Well, I can offer a data point for anyone else in the same situation. I just let it run with nothing in it to see how it would behave for at least the first few days. Within a few hours of plugging it in, it reached the expected temperature. Then over the next day and a half, the temperature rose 40 degrees. So at least in my case, letting it run for less than two days was long enough to demonstrate that it's malfunctioning.

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