A worn refrigerator door seal is a quiet, common cause behind several fridge complaints that look unrelated: constant running, frost build-up, condensation, and even food freezing unexpectedly all trace back to warm air leaking in past a seal that no longer grips. The paper test confirms it in under a minute, and replacement is a straightforward, inexpensive job on most models.
The paper test
- Close the door on a sheet of paper
Position it at one point along the seal and close the door normally.
- Pull the paper out
You should feel resistance the whole way. If it slides out freely with little to no resistance, the seal is not gripping at that point.
- Repeat all the way around both doors
Test at several points along the top, bottom and both sides — a seal often fails at one section while the rest still grips fine, so a single test point can miss the problem.
What a failing seal actually causes
| Symptom | Why the seal is involved |
|---|---|
| Compressor running far more than usual | Constant warm air infiltration forces continuous cooling |
| Frost building up inside | Humid air entering condenses and freezes on cold surfaces |
| Condensation on the outside of the door or nearby cabinets | Warm air meeting the cold exterior surface near the leak |
| Food freezing unexpectedly | The system overcompensates for the constant heat gain — see our fridge freezing food guide |
| Visible ice or frost specifically near one section of the seal | Localises exactly where the seal has failed |
Why seals fail
- Age and hardening. Rubber loses flexibility over years and stops conforming to the door frame.
- Food debris and residue. Build-up in the seal’s fold prevents it closing fully, even when the rubber itself is intact.
- Physical damage. Tears from sharp packaging edges, or repeated door slams, create gaps that never fully seal.
- Magnetic strip degradation. Most modern seals rely on a magnetic strip inside the rubber to pull the door closed — this can weaken over time independently of the rubber’s condition.
Cleaning versus replacing
- Clean the seal thoroughly first
Wipe it down with warm water and a little mild detergent, working right into the fold where debris accumulates. A seal that fails the paper test because of trapped residue rather than actual damage often passes once properly cleaned — this is worth ruling out before assuming replacement is needed.
- Check the magnetic grip
Hold a metal object like a butter knife near the seal with the door open — you should feel a noticeable magnetic pull. A weak or absent pull points at the magnetic strip rather than the rubber itself.
- Inspect for physical damage
Look for splits, tears, or sections that have come loose from their retaining channel around the door edge.
- Replace if cleaning does not resolve it
Seals are sold to match specific model ranges and usually push into a retaining channel around the door edge without special tools, though the exact process varies by manufacturer. Order using your model number — see our guide on reading the rating plate if you need to find it.
A seal that has become slightly misshapen from being folded in storage or from age (rather than damaged) sometimes softens and reshapes with gentle heat. Running a hairdryer on a low, warm setting along the seal while gently pressing it back into its correct profile can restore the seal’s fit without a full replacement — worth trying before ordering a new one if the rubber itself is otherwise sound.
When to call an engineer
Most seal replacements are genuinely manageable as a DIY job once you have the correct part. Call an engineer if the seal is fitted differently than expected (some built-in or integrated models have more involved fitting), if replacing the seal does not resolve the running or frost symptoms, or if you suspect the door itself has warped rather than just the seal failing.
Stop and call a qualified appliance technician or electrician if you find scorched or melted wiring, smell burning, see water that has reached electrical components, or if the fault returns immediately after a repair. Never bypass a safety device — thermal fuses, door interlocks and flood switches fail for a reason, and defeating one converts a broken appliance into a fire or flood risk.
