Appliance Spares
Quick answer: A fridge leaking water inside or onto the floor is almost always caused by a blocked defrost drain. Defrost water cannot escape through the drain tube, overflows the drain pan inside the fridge, and pools on the floor or at the bottom of the fridge interior. Clearing the drain is free. If the drain heater has failed or a door seal is leaking, parts typically cost $8 – $40.
Parts for this repair: Universal Defrost Termination Thermostat with clip — $8.95 · 3 x Defrost Termination Thermostat pack — $19.95 · Westinghouse / Kelvinator / Electrolux Thermostat 1409938 — $18.95 · Haier Temperature Sensor H0060401766 — $23.95 · Not sure? Use the Part Finder
What causes a fridge to leak water?
Frost-free refrigerators run a defrost cycle every 8 – 24 hours. A resistance heater melts frost from the evaporator coil, and the meltwater drains down through a tube at the base of the freezer, through the cabinet, and into an evaporation tray near the compressor where the heat from the compressor evaporates it. In a correctly functioning fridge, this happens invisibly.
When something interrupts this path — a blocked drain, a failed drain heater, or a door seal leak — water ends up where it should not.
| Cause | Likelihood | Where water appears | Fix |
|---|---|---|---|
| Blocked defrost drain tube | Most common | Inside fridge at the bottom; may overflow to floor | Clear the drain — no parts needed |
| Defrost thermostat failed (ice re-blocks drain) | Common | Same as above; drain clears temporarily but blocks again within days | Replace defrost termination thermostat — $8.95 – $19.95 |
| Defrost sensor fault | Possible | Frost overload on evaporator that eventually melts uncontrolled | Replace temperature sensor |
| Door seal worn or damaged | Possible | Condensation dripping inside fridge; frost or ice near the door opening | Replace door gasket seal |
| Cracked or overflowing evaporation tray | Possible | Water under the fridge only — not inside | Clean or replace tray |
| Water dispenser or ice maker dripping | Possible (applicable models only) | Near dispenser or at the front of the fridge | Different fault — see inlet valve or ice maker |
How to locate and clear the blocked defrost drain
This is the free first step and solves the problem in the majority of cases.
- Unplug the fridge and remove all food from the fridge section.
- Find the drain hole. In most frost-free fridges it is at the bottom-back of the fridge interior, sometimes behind a small plastic cover or ledge. On some models the drain sits in the freezer at the base of the evaporator coil.
- Clear visible debris. Remove the cover if present. Clear any food particles, mould, or sediment from around the drain opening with a soft brush or cotton bud.
- Flush the drain. Use a turkey baster or squeeze bottle to pour a small amount of warm (not boiling) water into the hole. You should hear it drain away through the tube below. If it backs up, the tube is blocked further down.
- Clear a stubborn blockage. Insert a thin flexible brush — a long pipe cleaner or straw brush — into the tube from the drain hole end and work it gently back and forth to break up the ice or debris.
- Check the drain tube outlet. Pull the fridge away from the wall and confirm the drain tube outlet at the back of the unit empties freely into the evaporation tray. A kinked tube is a common cause of recurring blockage.
- Plug back in and monitor. If no water pools within 48 hours, the problem is solved. If water returns quickly, the defrost thermostat may be failing and re-icing the drain — proceed to the next step.
Signs the defrost thermostat has failed
If you clear the drain and the water leak returns within one to two weeks, a failing defrost thermostat is the likely underlying cause. The thermostat controls when the defrost heater runs and stops. When it fails open-circuit, the defrost heater either never activates or never stops — both conditions cause abnormal frost accumulation that eventually melts in large volumes and overwhelms the drain.
Key signs the thermostat is the root cause:
- You cleared the drain and the fridge was dry for a week or so, but water has returned.
- Heavy frost is visible on the evaporator coil (behind the freezer back panel) after just a few days of normal use.
- The fridge section is also running slightly warm — indicating a concurrent cooling fault from the defrost failure.
Universal Defrost Termination Thermostat with clip (GE, Whirlpool, Hoover, Amana, universal) — $8.95
3 x Defrost Termination Thermostat pack — $19.95
Westinghouse / Kelvinator / Electrolux Fridge Thermostat 1409938 — $18.95
Haier Fridge Freezer Temperature Sensor H0060401766 — $23.95
For Samsung, Hisense, and other brands, use the Part Finder or search fridge defrost parts.
How to check your door seals for leaks
A failed door seal allows warm, humid air to enter the fridge continuously. That moisture condenses on the cold surfaces inside and can drip down to the floor, mimicking a drain leak.
To test your seals:
- Paper test: Close the fridge door on a piece of paper so the paper is sandwiched in the seal. Pull the paper out. If it slides out without resistance, the seal is not gripping and warm air is entering at that point. Repeat on all four sides of both fridge and freezer doors.
- Visual check: Inspect the rubber seal all the way around for cracks, tears, hardening, or sections that have pulled away from the door. Any gap allows air in.
- Torch check: At night, place a torch inside the fridge, close the door, and look around the door perimeter from outside. Any light visible through the seal indicates a gap.
If the seal fails the paper or visual test, replacing the door gasket will eliminate the ingress of warm air and the condensation drip it causes. Find your model number on the model sticker on the inner door frame and use the Part Finder to order the correct replacement seal.
What if the water is from the dispenser or ice maker?
If the drip is located near the water dispenser nozzle, the ice maker, or the front of the fridge rather than pooling inside the food compartment or under the unit, the fault is unrelated to the defrost drain. A drip from the dispenser while not in use typically indicates a failing inlet valve or check valve. Ice maker leaks usually point to the water supply line connection or the fill valve. Both are separate faults not covered in this guide.
Frequently asked questions
There is water pooling at the bottom of my fridge interior — what is causing it?
This is almost always a blocked defrost drain. The drain hole at the back of the fridge interior is blocked with debris or an ice plug, so meltwater cannot escape and collects in the food compartment. Clearing the drain takes under 15 minutes and requires no parts.
There is water on the floor under my fridge — is it the drain or the evaporation tray?
Pull the fridge away from the wall and inspect the evaporation tray near the compressor. If the tray is full and overflowing, the drain is passing more water than the tray can evaporate — often because the defrost system is running erratically and producing excessive melt. Check the defrost thermostat.
I cleared the fridge drain but water came back in less than two weeks. What next?
The defrost system is causing a rapid re-block. A defrost thermostat that has failed open-circuit means the heater never runs, frost accumulates quickly, and the resulting melt overwhelms the drain on a short cycle. Replace the defrost termination thermostat.
Water or ice is forming near the door of my fridge — is it the seal?
Yes, most likely. Condensation or ice near the door opening indicates warm, humid air is entering through a worn door seal. Run the paper test around all four sides of the door. If the paper pulls out without resistance anywhere, the seal needs replacing. Your model sticker on the door frame has the model number you need to order the correct seal.
My fridge has a water dispenser and it is dripping — is this the same problem as a blocked drain?
No — dispenser leaks are a separate fault, typically the water inlet valve, the dispenser tube, or the check valve. The blocked-drain cause described in this guide does not apply to dispenser drips. A drip from the nozzle while the dispenser is not in use usually indicates a failing inlet valve or check valve that needs replacing.
Related
- Samsung fridge not cooling — step-by-step diagnosis and fix
- Fridge not cooling but freezer works — all-brands guide
- Fridge defrost parts — all brands
- Defrost thermostats in stock
- Part Finder — find the exact part for your model
Ready to fix it?
- Clear the defrost drain first — it is free, takes under 15 minutes, and resolves the problem in most cases.
- If the leak returns within two weeks, note your model number from the model sticker on the door frame and use the Part Finder to identify your defrost thermostat.
- If water is forming near the door, run the paper test and replace the door seal if it fails.
- Order before 2 pm AEST on a business day for same-day dispatch from Sydney’s Northern Beaches.
Disclaimer: this article is general information only and is provided without warranty of any kind. Appliance designs vary between models and production runs — always follow the manufacturer’s instructions, switch off and unplug the appliance before starting any work, and confirm parts against the model number on your appliance’s model sticker. Any repair is undertaken at your own risk and Oz Appliance Spares accepts no liability for injury, loss or damage arising from work performed after reading this guide, to the maximum extent permitted by law. If in doubt, use a qualified technician.
