The short answer
Water under a top-freezer is nearly always defrost melt that cannot reach its drain. A sheet of ice under the freezer floor, then water in the fridge and on the kitchen floor, is one blockage showing itself three ways.
What you actually see and hear
- A sheet of ice under the freezer floor — The drain is blocked and the melt water freezes where it sits.
- Water in the bottom of the fridge or under the drawers — The same blockage, overflowing downward.
- Water on the kitchen floor at the front — The overflow reaching the end of its journey.
- Water under or behind the cabinet — The evaporation tray, full, cracked or knocked out of place.
- Water with the contents warming — A cooling failure with a leak attached. Read the cooling page too.
Causes, most likely first on this machine
- Blocked defrost drain — First by a wide margin. Everything else on this list is less common than this one tube.
- Evaporation tray full, cracked or displaced — Second. It sits on the compressor and is easily knocked when the cabinet is moved.
- Door seals admitting humid air — Third. More moisture in means more frost, more melt and more water to carry away.
- Cabinet not level — Fourth. A forward lean sends melt water to the floor rather than to the drain.
- Water supply connection to an icemaker — Fifth, and only on cabinets that have one.
- A genuine internal fault — Last, and uncommon.
Check in this order, and why
- Look under the freezer floor for a sheet of ice — It is the most informative single look on this cabinet.
- Check whether the contents are still properly cold — It separates a nuisance from an emergency.
- Pull the cabinet out and check the tray — Expect it out of place if the fridge has been moved.
- Check the seals and the level — Both stop the puddle coming back.
What an owner can safely check
- Check both compartment temperatures with a thermometer — Cold contents mean water; warming contents mean cooling.
Tools: thermometerAbout 15 min
- Empty the freezer and flush the drain with warm water — A turkey baster or a soft tube. Never a metal probe.
Tools: turkey baster, warm waterAbout 40 min
- Pull the cabinet out, empty the tray and reseat it square — Check it for cracks while it is accessible.
Tools: towel, shallow trayAbout 20 min
- Clean both door seals and test them with paper — Less humid air in means less frost and less melt.
Tools: cloth, paperAbout 20 min
- Level the cabinet with a slight backward tilt — It helps the doors close and the melt water drain.
Tools: spirit levelAbout 20 min
- STOP HERE before removing the rear freezer panel to reach a frozen drain — The heater and live terminals are behind it.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel - a capacitor can hold a charge after the power is off. The defrost heater and live terminals sit behind the rear panel inside the freezer compartment, and a capacitor can hold a charge after the power is off. Never melt frost with a heat gun or a naked flame, and never chip at ice with a metal tool near the liner or the tubing behind it.
When to call a technician
Call when the drain will not clear from inside the freezer, because the blockage is then behind the rear panel where the defrost heater lives. Call urgently if the contents are warming as well - that is a cooling failure and the water is only its symptom. Clearing a drain, emptying a tray, cleaning a seal and levelling a cabinet are all owner jobs and between them they account for most leaks.
Nearest pages of this class
What this page does not cover
This page is written for the top-freezer refrigerator class, not for one family or model line. Where a brand- or model-specific page exists for your unit it is the more specific answer and it is linked above, so go there first if your machine is named. What is deliberately not here: fan and damper part numbers, thermistor values, refrigerant charge and shelf dimensions, all of which differ by family and belong on the page for that family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
