I have sub-zero fridge about 18 years old. It has started this loud humming noise while it is running. it varies how long this noise will go on, sometimes a few minutes other times a half hour. This happens many times, on and off during the day and night. I also have ice built up to approximately 60% of the coils, at the rear. Would appreciate a solution. Thanks.
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Re: noise & icing
Sonds like thre is a problem with the defrost because you should not have that much ice on the coils. go ahead and do a manual derfost and make sure that the drain lne is clear and not frozen up. If it is oyu can use a turkey baster with hot water to thaw it until the watr flows easily out the tube in the unit. also how are you gaskets looking? are they starting to leak air into the freezer and the refrigerator/ at 18 years old those are a few of the things to look at. Hopte that htis solves yur problems and if not don't rate this and I can still come back and post answer or solutions for yu. After the final them rate if you would be so kind. Thanks for using FixYa.
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Compressors usually make a thrumming/humming noise, so yes, this sounds like the fan. It could be something touching the fan blades, like ice or a wire. If you can unplug the fridge and remove panels near the fan, you may discover the problem.
if you have ice buildup then the fridge may be low on freon. or there is dust clogging around the pump or fan is not running. remove the bottom or back and look around the compressor. see that the fan is running.
Sounds like the freezer fan is rubbing some wires or possible some foam insulation around the fan. I would look into the freezer compartment fan and go from there. The fan Will Shut off when you open the doors. Let me know how you make out and if you need anymore help.
if it is coming from under your unit is it most likely the water inlet valve for the icemaker check that and let me know you will have to remve the 2 screw on the kick plate to get to it,it should be on the left side
The motor for the auger drive runs pretty slow (about 18 rpm), it could be the drive is running continuously (unless the door is open). Check that and let me know some more info, is the noise real loud, soft, etc. Can you feel anything vibrating or running when the door switch is pressed in?
I recently fixed a similar problem with my freezer. I searched first and found this and a few other sites which listed this and wanted to provide input for anyone in the future.
I have a GE GSH25JSRF SS. It is about 3 years old. Several months ago I noticed when the evaporator fan in the back of the freezer turned on it would make an awful howling or whistling sound. Basically sounded like what you would hear from the window of an older house if the wind outside was blowing real strong. It was loud enough to hear on the other end of the house.
I was convinced that it HAD to be the air blowing over the venting or a gap that created that sound. But I read different solutions on the internet and decided to take a chance on simply replacing the evaporator motor and attached fan blade. That solution worked and my house is quiet again, thank god.
I ordered the parts from a supplier on the internet. Keep in mind, though, if you're not real handy it may be more than you bargain for. Might be easier to have a service guy come out.
I'm still not sure exactly what aspect of these parts caused the howling sound. It could be a bearing within the motor or perhaps the fan blade slipping due to wear. Either way, it's fixed now. Just wanted to share. Thanks.