Question about Sub-Zero 700TCLH Bottom Freezer Refrigerator

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My sub zero is making a loud humming noise - Sub-Zero 700TCLH Bottom Freezer Refrigerator

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  • Sub-Zero Master
  • 43,501 Answers

Hi,

Here is a tip that I wrote about refrigerators and the fan noisethat they develop sometimes...

RefrigeratorFan Noise
heatman101

Posted on May 18, 2011

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Posted on Jan 02, 2017

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localwonder
  • 6784 Answers

SOURCE: loud humming noise

HI. Just so you know, Hissing and popping is normal on frost free refrigerators, it is the defrost heater, in this case. I would check these following areas to address any other abnormal noises.

If the level of the unit is not adjusted to proper specs, this will create an unstable operating condition, causing many noises to emit from the units structure. inspect the unit for proper level. adjust if needed. Next will be the drain pan. Once removed for cleaning, the pan must be replaced in position correctly. If not, the pan will rattle against the compressor, causing a ping or rattle.Simply reposition the tray if this is the case. The third possible issue will be the condenser fan. The condenser fan is located behind the refrigerator. It may be necessary to remove an access panel to reach it. This fan has a shroud, and if the fan blade becomes warped, it will rub against the shroud, causing noise. This fan blade is whole,and it can be removed and replaced if this is the case. Ok, the fourth problem spot will be the evaporator fan.

The evaporator fan is located at the back of the freezer. It may be necessary to remove obstructions such as the contents of the freezer, freezer shelves, ice maker and the rear inside panel of the freezer. The rear panel may be held in place by retainer clips or screws. Remove the screws or depress the retainer clips with a small screwdriver. Check the fan for warped blades. if the blades are warped or mis-aligned, replace it. This fan also is protected by a shroud as well, and it will make noise if the fan blade is damaged.

Last, i would move on to the compressor mounts. This is the most common spot for noise overtime. The compressor sits on rubber mountings. Those rubber mountings are designed to absorb vibration from the compressor. As the mountings age, they can become hard or disintegrate. When this happens, the compressor vibration is transmitted to the refrigerator structure and it can cause noise.


The compressor is located in the rear. It may be necessary to remove an access panel to get to the compressor.

Locate the compressor and remove the screw or retaining clip of just one of the compressor mounts.Using a pry bar, lift up the compressor enough to slip out the rubber mount. Inspect the mount for deterioration. The rubber should be firm but not rigid. If the mount is crumbling or hard, it should be replaced.


This concludes the inspection procedure. Follow carefully, and replace any failed or damaged device.

Posted on May 23, 2010

  • 33 Answers

SOURCE: My sub zero 642 just starting making a humming

I know this sounds so stupid but I see this sort of thing at least once a week it's vibrating on cab. Or the main thing is a bolt came loss and when you open the door it aplies weight down and it will make the bolt or nut vibrate being a sub zero it could be the compresser on top or the trim or the cabinet virating on back of shell. Hope this helps

Posted on Apr 29, 2010

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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

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If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

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check your evaporator and, condenser fans and, lube them with machine oil one of the back ones is stuck
I would never get rid of my Sub Zero they are the best made and, I service all makes of refrigerators good for you; buying the best!

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