Direct answer
For the Samsung RT18M6215 top-freezer refrigerator, the first wet location separates supply/filter/valve, defrost drain, ice maker and condensation causes. First, dry all areas and locate where water first appears.
What this covers
- Samsung RT18M6215 top-freezer refrigerator (RT18M6215*)
- Samsung top-freezer refrigerator; the freezer sits above the fresh-food compartment and cold air falls into it from there.
- The specific fault this record addresses: is leaking water
What it does not cover
- ×The same symptom on a different Samsung product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The defrost drain is blocked
What separates it Water pooling under the crisper drawers, or ice building up in the bottom of the freezer, appearing on a regular cycle rather than continuously.
How to confirm Every frost-free refrigerator melts its evaporator frost periodically and drains that water to a pan underneath. When the drain blocks with debris or freezes, the melt water overflows into the compartment instead. This is the single most common refrigerator leak.
- 2
The water filter housing or its connection is leaking
What separates it Clean water at the front or inside the fresh-food compartment, appearing right after a filter change.
How to confirm A filter not seated fully, or an O-ring left from the previous filter, are the usual causes. Remove and refit the filter carefully.
- 3
The supply line connection is weeping
What separates it Clean water at the rear of the unit or under it, present even when nothing has been dispensed.
How to confirm Check the connection at the refrigerator and at the shut-off valve.
- 4
Condensation from a door left ajar or high humidity
What separates it Water droplets on interior surfaces or around the door opening rather than a pool, worse in humid weather.
How to confirm See door-not-closing. Warm humid air entering continuously condenses on cold surfaces.
- 5
The drain pan is cracked or overfull
What separates it Water on the floor under the rear of the unit with no water inside the compartments.
How to confirm The pan under the unit is designed to hold defrost water until it evaporates. A cracked pan, or one overwhelmed by a genuine defrost problem, spills onto the floor.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Where the water appears: under the crispers, in the freezer floor, at the rear, or on the floor. Each points at a different source.
- Whether it appears continuously or on a repeating cycle, which points at the defrost cycle.
- Whether the water is clean supply water or has been sitting.
- Whether a filter was changed recently.
Determine whether the water appears on a repeating cycle
ReversibleWater that reappears every several hours follows the defrost cycle and points squarely at a blocked defrost drain.
Locate and clear the defrost drain
ReversibleIt is usually at the base of the rear freezer wall. Clearing it per the manual's method resolves the most common refrigerator leak there is.
Reseat the water filter and check for a leftover O-ring
ReversibleA leak that started right after a filter change is almost always the filter itself.
Check the supply connection at the unit and at the shut-off valve
ReversibleClean water at the rear with nothing dispensed points here.
Inspect the drain pan underneath for cracks or overflow
ReversibleWater on the floor with dry compartments points at the pan rather than inside the cabinet.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- RT18M6215*. Samsung top-freezer refrigerator; the freezer sits above the fresh-food compartment and cold air falls into it from there.
- Type — TOP-FREEZER (no through-door dispenser)
- A top-freezer refrigerator (freezer on top, fridge below) — the simplest, most reliable layout. It has NO through-door water or ice dispenser (top-freezers do not), so any 'dispenser' symptom does not apply to this model; you fill water and take ice from inside.
- Ice maker
- This model can have a factory automatic ice maker in the top freezer (verified), fed by a water line. If fitted, 'no ice' traces to the water line/valve, the ice maker being switched off, or the freezer temperature; if your unit has no ice maker installed, ice is made in trays instead.
- Cooling
- A single cooling system with the freezer on top. If the fridge is warm but the freezer is cold, the vent that passes cold air down to the fridge may be blocked by packed food or iced up from a defrost issue — clear the vent and do not overpack the top of the fridge.
- Symptom boundary
- This record covers Samsung RT18M6215 top-freezer refrigerator when it is leaking water. A different symptom on the same hardware, or this symptom on a different Samsung product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Close the water supply and unplug the unit for water spraying under pressure, a cracked supply line, or water reaching an outlet or wiring.
- !Water under a refrigerator that has been leaking for some time damages flooring and subfloor — check underneath and behind, not just the visible area.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Samsung Support publishes this as "Samsung washing machine information and error codes". Samsung's own washer troubleshooting and error-code article; covers filling, draining, spin and unbalanced-load conditions. What that article does not carry is the model boundary — it is written for a product line, and RT18M6215* is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
Where is the water dispenser on my Samsung RT18M6215?+
There isn't one — this is a top-freezer refrigerator, and top-freezers do not have a through-door water or ice dispenser. You take water and ice from inside. If your unit has the factory ice maker in the freezer, ice is made there automatically from a connected water line; otherwise you use ice trays. So dispenser troubleshooting simply does not apply to this model.
There's water pooling under my crisper drawers.+
That is the classic sign of a blocked defrost drain. Every frost-free refrigerator melts frost off its evaporator periodically and drains that water to a pan underneath — when the drain blocks with debris or freezes over, the melt water overflows into the bottom of the compartment instead. The drain is usually at the base of the rear freezer wall.
It only leaks every few hours, not constantly.+
Water that reappears on a repeating cycle rather than continuously is following the defrost cycle, which confirms a defrost-drain problem rather than a supply leak. A supply leak would be continuous or tied to dispensing.
Does this answer apply to every Samsung model?+
No. It is scoped to RT18M6215*. Samsung top-freezer refrigerator; the freezer sits above the fresh-food compartment and cold air falls into it from there.
What should I record before troubleshooting leaking or water under fridge?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing leaking, water under fridge. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Close water and unplug for spraying, electrical wetting or a cracked line.
Answer for the exact device and software version shown above.