Replace Sub-Zero Gasket – Instructions – Rubber Door Seal Guide

Sub-Zero Gasket Installation Guide & How To

If you have come here thinking a gasket install is a simple task, think again! If you think you aren’t capable of doing this, do not bother and call someone who says they are capable. If you are handy, read on, and have patience because this is a tough one! If you want us to put your Sub-Zero Gasket on your door, give a call and we will do it today.

I love working on and replacing Sub-Zero Gaskets. They really are a challenge and as these beautiful units get older, we get more and more calls about replacing gaskets. Since it is just a rubber seal with some bolts attaching it to a door a lot of customers try to take it on themselves, which we love to see. However, the truth is that a Sub-Zero gasket installation is no walk in the park. It takes skill and patience, and a lot of it. Check out the guys at Appliantology and their helpful guide. Now, lets talk about replacing a gasket on a Sub-Zero 300, 500 and 600 series door.

Step One – Warm up the gasket and get the right shape.

Gasket installation sub zero door seal

Give the Gasket a Warm Bath in the Sink

When you unbox the gasket it is going to be folded over and it will be all out of shape. This is only a problem if you try to install it like this. Sub-Zero says to use a hair dryer on the areas with kinks in them. We did this for years before learning the real way to cure the issue. Give the gasket a warm bath in the sink. Not a scolding hot bath. Keep the gasket submerged for a few minutes.  Lay the gasket out on the floor on some towel like it would go on the unit. It should be straight now, not twisted up or disfigured. Pat it dry with towels, it doesn’t need to be bone dry before you start to put it on.

Sub-Zero door gasket installation

I do not take off the metal strips that hold on the gasket, rather loosen them a great deal and slip the new gasket in.


 Start Removing the old gasket from the door.

I do this in sections and I always start at the top and work my way down. Do not remove the full gasket,rather remove sections of it at a  time. I try not to even remove the metal strips that hold the gasket on. Instead, I remove a few of the bolts but loosen the rest evenly across the whole strip. Once loose, The old gasket should be able to be pulled out and the new gasket slipped into its place. Check out this picture to the right to see what I mean. I do not remove the metal strips, I remove a few bolts and loosen the rest. Now, with a little bit of force, the new gasket should be able to slip right behind the metal strips and into place.

Don’t tighten bolts yet!

Now you should be getting the hang of it. Remove some bolts, slip the new gasket in, put the bolts back in, don’t tighten them, we do not tighten the bolts fully until the end. Right now they are just being tightened enough to keep the gasket in place on the door. Work your way around the door slowly. Peel off the old gasket a few feet at a time, slip in the new gasket, lightly screw in bolts so it hold onto the gasket.

Sub-Zero Gasket Installation Seal Guide

Get the bead in position in the metal strip on the door. Keep the bolts on the door loose and pull on the gasket, feel it snap into place.

The Lip of the Gasket Must be Seated in the Metal Strip.

When you are slipping your new gasket into the metal strips you will realize that the metal strips have a little groove where it holds onto the metal bead on the gasket. This is the lip of the gasket and it is important to have it situated nicely in the metal strip. You do this by getting the gasket in place and pulling on the outer edge (thick part) of the gasket. Look at the picture to the left to see an example of what I mean.The bolt should be loose enough that when you pull on the gasket it gives, but tight enough that when you pull it doesn’t pop out. If it pops out, get it  back in the metal strip and try again.

Get ready to tighten the Bolts.

This is where it is critical to make sure your gasket is seated correctly. Look at the corners of the doors, I bet you notice lots of slack here. That is okay because all of your bolts are relatively loose.  If there is extra slack at the bottom or top, you must move the gasket with your hand until the slack is gone and distributed equally amongst the door. With your hands you need to make sure the corners look nice and tidy, they should be tucked in and closely hugging the door frame. Look at the image below to see what I mean by a bad installation vs a good installation. Once we are in the “good position” and everything is tucked in neatly , we are ready to tight the bolts.

Sub-Zero Gasket installation

Get the gasket tucked in neatly, on the left it is not, on the right it is nice and snug, ready to have its bolts tightened. Make sure it is like this on all sides. If there is extra slack at the bottom or top, you must move the gasket with your hand until the slack is gone and distributed equally amongst the door.

 Tighten the Bolts, Don’t Over Tighten the Bolts!

Everything is tucked in, the gasket is looking pretty. Lets start to tighten the bolts, don’t over tighten them or they will strip. Make your way around the door. Make sure there isn’t too much slack in one place or another. Tighten those bolts! Patience, keep checking for slack. Almost finished.  Once complete, the door should close just as it did before, If it needs an adjustment thats another story for another day.  Check out the photo below for a nice looking installation !


sub-zero gasket- installation

Nice and neat all the way around, no extra slack. This is done correctly.


Contact Us for Sub-Zero Repair & Service in NY and NJ.

Are you located in New Jersey or New York and don’t wan’t to do this yourself?  Give us a call today and we can help. We service Sub-Zero exclusively and enjoy doing it. Please feel free to call or email us using our contact form located through out the site. Have any questions? Give a call, we will help you no matter where you are.


Tagged with: , , ,
Posted in Sub Zero Repair NJ, Sub Zero Repair Tips, Sub-Zero Repair NY