A fridge door seal, or gasket, needs replacing when it is torn, split, flattened or no longer grips the cabinet all the way round. On most commercial fridges, replacing it is straightforward: Williams' manual says the old gasket pulls out and the new one pushes into its channel, starting at the centre and working along. The hard part is getting the right gasket for the model. A seal that is just dirty or not seated properly can often be cleaned and refitted instead.
This guide covers how to check a seal, how to clean it, how replacement works on push-in and screw-in types, and why a failing seal costs more than it looks.
At a glance
| What you notice | Likely problem | What to do |
|---|---|---|
| Seal sticky, mouldy or dirty | Needs cleaning | Wipe with warm soapy water, rinse and dry |
| Seal has come out of its channel in places | Not seated | Push it back in fully |
| Gaps when the door is shut, frost around the door | Seal flattened, or door out of alignment | Adjust the door, or replace the seal |
| Torn, split or hardened seal | Damaged | Replace it |
| Cabinet running constantly, warm inside | Seal, or another fault | Check the seal first, then call an engineer |
Why door seals matter
Every gap in a door seal lets warm, humid air in all day. The cabinet has to run longer to hold temperature, frost and ice build up around the door and on the evaporator, and the extra moisture shows up as condensation and water. Williams puts it simply in its operating manual for cabinets and counters: damaged gaskets do not seal correctly and can increase the electricity consumed, seriously affecting the efficiency and performance of the appliance.
In a commercial kitchen, a poor seal can also be the reason a cabinet will not hold the 8°C or below that chilled food needs, which our guide to chilled food temperature rules explains.
How to check a door seal
- Look at it all the way round for splits, tears, cracks, hardened or flattened sections, and mould.
- Check it is seated. Foster's service manual lists making sure gaskets are snapped in completely as a first check when they are not sealing.
- Close the door on a strip of paper at several points round the door. If it slides out with no resistance, the seal is not gripping there.
- Look for frost or condensation around the door frame, which shows where warm air is getting in.
- Check the door itself. A dropped hinge or a cabinet that is not level can stop a good seal meeting the frame. Foster's manual says to check the door and the magnetic gasket, and adjust the door or replace the gasket if broken.
How to clean a door seal
Many seals that look worn are just dirty. Williams says door gaskets should be checked and cleaned regularly, wiping them with warm soapy water and a soft cloth, and making sure they are completely dry before closing the door. Foster's cabinet user manual gives the same advice: wipe with a warm damp soapy cloth, then a clean damp cloth, and dry thoroughly. Clean inside the folds, where food and grease collect.
Williams warns never to use a sharp knife to clean or scrape a gasket, because a damaged gasket will not seal correctly.
Replacing a door seal
Push-in seals
Most modern commercial cabinets use push-in gaskets that sit in a channel round the door. Williams describes the replacement: pull out the existing gasket, then push the new one into the channel, called the gasket retainer, starting at the centre and working along. Push it in evenly so it sits flat all the way round.
Screw-in seals
Some doors, especially older ones and many domestic fridges, hold the gasket under the edge of the door liner with screws. The screws are loosened, the old gasket lifted out, and the new one fitted before tightening back up in sequence so the door does not twist. This takes more care, and over-tightening can distort the door.
Getting a new seal to sit right
- Order the gasket by the cabinet's model and serial number from the rating plate. Seals vary in size, profile and fixing, even within one brand.
- A new seal that has been folded in its packaging may not sit flat at first. Leaving it in a warm room before fitting helps it relax.
- Check the door closes and seals evenly once fitted, and that the door is level.
Repairing or replacing a seal
Small tears can sometimes be patched, but on a commercial fridge a patched seal rarely lasts, and the energy wasted by a poor seal soon costs more than a new gasket. Replacement is usually the better option. If the seal is fine but the door does not meet the cabinet, the problem is the door or hinge, not the gasket.
If a cabinet is old and needs seals, a compressor or other major parts, our guide to repairing or replacing a commercial fridge helps with the decision.
When to call an engineer
- You cannot identify the right gasket for the model.
- The door is dropped, twisted or not closing evenly.
- Frost keeps building up after the seal has been replaced.
- The cabinet still will not hold temperature with a good seal, which points to another fault. Our guide to commercial fridges that stop cooling covers the next checks.
Our commercial refrigeration repair engineers replace door seals and adjust doors on cabinets, counters and cold rooms across London, and planned refrigeration maintenance includes checking them.
Questions people ask about fridge seal replacement
Can you replace the seal on a fridge door?
Yes. On most commercial cabinets the gasket pushes into a channel round the door, and Williams describes pulling the old one out and pushing the new one in from the centre outwards. Some doors use screw-in gaskets, which take more care.
How do I know if my fridge seal needs replacing?
Look for tears, splits, flattened or hardened sections, gaps when the door is shut, and frost round the door. A strip of paper that slides out of the closed door easily shows the seal is not gripping.
How do I clean a fridge door seal?
Wipe it with warm soapy water and a soft cloth, then a clean damp cloth, and dry it thoroughly, as Williams and Foster both advise. Never scrape it with a knife.
Does a bad door seal use more electricity?
Yes. Williams says damaged gaskets can increase the electricity consumed and seriously affect the efficiency and performance of the appliance.
Can a fridge seal be repaired?
Small tears can sometimes be patched, but on commercial fridges a new gasket is usually the better and longer-lasting fix.
Why is my new fridge seal not sealing?
It may still be creased from its packaging, not fully pushed into the channel, or the door may be out of alignment. Make sure it is seated all the way round and the door is level.
The short version
Clean the seal first, check it is seated, and adjust the door if it does not meet the frame. If the seal is torn, flattened or hard, replace it with the right gasket for the model. A good seal saves energy, frost and stock.
Last updated: 4 November 2026
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.