The short answer
Water at a full-size refrigerator usually comes down to one thing: the defrost drain is blocked. Next on the list: the supply line or its fitting is weeping. Where the water appears — under a drawer, behind the cabinet, or down the door — decides this faster than any tool.
What you observe
- Water where there was none before — Under a drawer, behind the cabinet, or down the door — each points elsewhere.
- Water pools under the crisper drawers first — The channel backs up before it overflows to the floor.
- A slow puddle behind the cabinet that returns after mopping — Pressurised water refills a dried patch; drain water does not.
- The leak started within days of a filter change — The only joint disturbed was the one that is now leaking.
- NEAR MISS — the cabinet is also failing to hold temperature — Read the cooling page first — that is one fault with two symptoms.
Causes, most likely first on this unit
- The defrost drain is blocked — First on any auto-defrost cabinet, and by a wide margin. Melt water from each defrost is supposed to run down a small channel to a pan over the compressor. Let food debris or a plug of ice close that channel and the water backs up, freezes into a sheet under the crisper, then finds the floor.
- The supply line or its fitting is weeping — Ranked here because it is the only water source on the cabinet that is under pressure all day, every day.
- The filter head or cartridge seat is leaking — Ranked here because it is the one water joint the owner routinely opens and closes themselves.
- The condensate pan is cracked, overfull or out of position — Last, and worth a look while the coil is being cleaned anyway.
Check in this order, and why
- Find the drain hole at the base of the rear wall and clear it — A blocked channel is the commonest leak in refrigeration.
- Dry behind the cabinet and look for a returning wet patch — A joint under pressure weeps continuously, not in bursts.
- Look at the filter housing and check when it was last changed — A leak dating from a filter change is a filter seat, every time.
- Isolate the cabinet and check the pan sits square and whole — Everything that drains lands here, so it is always worth a look.
What an owner can safely check
- Dry everything and find out where the water reappears first — The first wet point is the source; mopping blind loses the diagnosis.
Tools: towelsAbout 15 min
- Flush the drain hole at the base of the freezer rear wall — Warm water and a soft turkey baster. Never wire.
Tools: warm water, basterAbout 30 min
- Dry the area behind the cabinet and recheck after some hours — If it returns with the cabinet idle, it is the supply.
Tools: towels, torchAbout 20 min
- Reseat the filter cartridge and check no old O-ring stayed behind — Two rings on one seat will always weep.
Tools: towelsAbout 15 min
- STOP HERE before disturbing any water fitting or removing a rear panel — Water under pressure and live terminals in the same space is a service job.
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. Shut the water supply off before disturbing any fitting behind the cabinet, and never cut or lever a refrigerant line to make room for a hand.
When to call a technician
Call once you have cleared the drain, confirmed the cabinet is level and dried the area, and water still returns. Call without waiting if water behind the cabinet refills after mopping: pressurised water does not stop on its own. Call immediately if water is reaching an outlet, a plug or any electrical connection — switch the circuit off first.
Nearest pages of this class
What this page does not cover
This page is written for the brand and the cabinet class, not for one family or model line. Where a family- or model-specific page exists for your unit, it is the more specific answer. Deliberately absent: board and fan identifiers, wiring colours, water routing and charge figures, which differ between the top-freezer, side-by-side, French-door and integrated families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
