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Short version: most refrigerator leaks are the appliance's own defrost water taking a wrong turn. Start with blocked or frozen defrost drain. If the water is clean, cold and continuous, close the supply valve first and treat it as plumbing.
The symptoms, and the ones that mean something else
- Clean cold water on the floor at the front — Water at the front usually ran forward from inside; water at the back is more often supply.
- A sheet of ice across the freezer floor — Defrost water freezing where it stands means the drain opening below it is blocked.
- Water pooling under the crisper drawers — The classic blocked-defrost-drain signature: water that should have run to the pan backs up into the lowest point of the fresh-food compartment.
- NEAR MISS — the water is warm, or soapy — Warm or soapy water came from somewhere else in the kitchen. Dry the floor, put paper down, and confirm the source before opening anything.
What actually causes this, ranked
- Blocked or frozen defrost drain — What makes this cause so common is that it is silent: nothing stops, nothing sounds different, and the first evidence is water somewhere it should not be, weeks after the tube first closed. First, because nothing else on the list explains as many of these calls, and ruling it out costs nothing but a few minutes. A smaller brand rarely publishes a service manual to the public, so the order below leans on what is visible from outside rather than what a schematic would tell you.
- A compression fitting or filter head weeping — Any cabinet plumbed for ice or a dispenser has mains water at the back under pressure, and every joint in that path is a potential leak: the shutoff, the compression fitting, the filter head and the fill valve itself. It follows the first because the two produce the same complaint, and this one is the cheaper of the pair to eliminate.
- Drain pan cracked, dislodged or overflowing — A pan that is simply full is also possible in a very humid room or when the doors are opened constantly, because evaporation cannot keep pace with what the defrost cycle delivers. It ranks here because it is genuinely less common, not because it matters less when it happens.
- A gasket that no longer seals, so the cabinet sweats — The tell is that the water arrives with other complaints — more frost, longer run times, food spoiling in the door — because all of them come from the same leak of warm air. Last, and deliberately so — it should be where a diagnosis ends rather than where it starts.
Check in this order, and why
- Check under the crisper drawers for standing water — Water at the lowest point of the fresh-food compartment with a dry floor behind the cabinet means the drain, not the supply. First: the answer here changes everything you do next.
- Check whether the water keeps arriving when the unit is switched off — Water that arrives regardless of the cycle is mains water, and the shutoff is the immediate answer. Next, because it takes the same few minutes and covers the other likely half.
- Remove the base grille and look at the pan while the unit runs — A pan sitting proud of its clips, or one with a visible crack, settles the question on the spot. Third, and only if the two above found nothing.
What you can do yourself
- Empty the freezer floor and pour warm water slowly into the drain opening — Repeat until it runs freely; never push anything metal or sharp down the tube.
Tools: warm water, turkey baster or funnel, towelsAbout 40 min
- Close the water shutoff to the cabinet and see whether the leak stops — This is both the diagnosis and the first aid: it protects the floor while you arrange the rest.
About 15 min
- Adjust the levelling feet so the cabinet sits firm with a slight backward tilt — It helps the doors close on their own as well as keeping the pan level.
Tools: adjustable spanner, spirit levelAbout 25 min
- STOP before testing anything electrical with the power on — The checks above are all done cold. A test that needs power applied is a technician test, whatever a video shows.
Read this before you start
Safety
Unplug the refrigerator or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Never chip ice off a coil or a liner with a knife or a screwdriver: the tubing behind it is thin, and puncturing it releases the charge and ends the life of the cabinet. Let ice melt on its own.
When to hand it over
The line is at the evaporator cover and at any joint under mains pressure. Before it, warm water and a cloth solve most of these; past it, the panel comes off and that is a technician's work.
Pages next to this one
Scope, and what is missing from it
A note on scope: this page treats Kostch refrigerators as one class. A page written for your specific family or model line will carry what this one deliberately leaves out — component locations, fastener sizes and the disassembly order — and it takes precedence over this page for your unit.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
