Washing Machine Keeps Filling: 1 Simple Test Splits It

Last Updated on September 2, 2026 by Umar Farooq

If a washing machine keeps filling right now and will not stop, turn off the supply valves behind it immediately.

Do that before anything else, and specifically before unplugging. It seems backwards — surely cutting power stops the machine? — but an inlet valve that has failed mechanically stays open whether or not the machine has power. Unplugging a washer with a stuck valve just leaves you with a dead machine that is still filling. The valves at the wall are the only thing guaranteed to stop it.

Once the flood risk is handled, the diagnosis turns on one question that most guides skip entirely: is water arriving too fast, or leaving too slowly?

Both look identical from the front. In both cases you have a drum with a rising water level and a machine that seems to be ignoring it. But one is an inlet problem and one is a drain problem, and nothing you do to fix the first will help the second. Working that out takes two minutes and saves you from replacing a perfectly good inlet valve.

This guide is for water that keeps entering past the expected level. If the machine fills and then empties straight away, see washing machine fills then drains.

The one test that splits the diagnosis

With the supply valves closed, watch the drum.

Level still rising with the valves closed → water is not coming from the supply. Something is siphoning, or the level reading is wrong.
Level static with valves closed, rises when opened → genuine inlet problem. Continue below.
Level falls slowly on its own → the drain is working but being outpaced. The inlet is the problem.
Level does not fall at all → drainage is the real fault, and the “overfill” is a symptom of it.

That last case deserves explaining, because it is the one that sends people down the wrong path.

Several brands run the drain pump automatically during an overfill condition. It is a designed safety response — the machine detects a level it does not like and starts pumping to hold it down while it works out what to do. Which means that on those machines, a partially blocked pump filter turns a modest, harmless inlet excess into a level that only ever climbs. The inlet valve is fine. The sensor is fine. The pump is trying. The filter is full of coins and lint, and the machine is quietly losing a fight nobody told you it was having.

If your drain is restricted, fix that first and the overfill often disappears on its own.

Why a washing machine keeps filling: the likely causes

A drainage restriction the machine is compensating for. Clogged pump filter or restricted drain hose, as above. Check this before condemning any valve.
Siphoning from drain hose installation. If the hose sits too deep in the standpipe it can seal and siphon, so the machine refills continuously to compensate. Do not insert the hose more than about 4 inches into the standpipe.
A mechanically stuck inlet valve. The failure most people assume first. Confirmed by whether water still flows with the machine unplugged.
A pinched, cracked or disconnected pressure hose — the narrow air tube running from the tub to the level sensor. It works by trapping air, so a crack anywhere along it means the sensor reads an empty tub no matter how full it is.
Excess suds distorting the level reading. Foam sitting over the sensor port makes a full tub read empty, so the control keeps adding water to a drum that is already too full.
Water entering through the detergent dispenser path, where residue routes supply water straight through.
A control-board fault that never cuts power to the valve. Genuinely last.

The safe checks

1. Confirm the supply side

With the valves closed, does water still enter? If yes, the inlet valve is not your problem — look at siphoning and at the level reading instead.

2. Unplug while it’s filling

Restore the supply briefly, reproduce the fill, then unplug the machine at the wall while water is actively entering. This is the cleanest single test in the whole diagnosis, because it separates “the valve is broken” from “the valve is being told to stay open” — two very different repairs that look identical.

Water stops immediately → the valve is only open because it is being commanded open. The valve itself is fine. Look at the pressure hose, suds, or the level sensor.
Water keeps flowing with no power → the valve solenoid is mechanically stuck open. It needs replacing, and the supply valves stay closed until it is.

3. Check the drain hose for siphoning

Confirm the hose end is not inserted more than 4 inches into the standpipe.
Confirm the height is within your machine’s documented range.
Confirm the outlet is not submerged in standing water.

4. Check drainage actually works

Run a spin-only or drain cycle with the drum otherwise empty and confirm water leaves cleanly. If it doesn’t, stop here and treat this as a drain fault — see washing machine won’t drain.

5. Inspect the pressure hose

With water and power off, find the narrow tube running from near the bottom of the tub to the level sensor. Confirm both ends are seated, and check its length for pinches, kinks or residue. Clear gently — stretching or forcing it cracks it, and a cracked one causes exactly the fault you are trying to fix.

6. Rule out suds

Run one empty cycle with no detergent. If foam still appears, you have residue build-up rather than a dosing problem, and it will take two or three empty cycles to clear.

Stop-use warning: Don’t work inside the cabinet with power connected, and never leave a continuously filling machine unattended. If you smell anything electrical, see water reaching electrical components, or water keeps entering after the supply valves are closed, stop and call a professional.

Read your result

What you observed	What it means	Where to go next
Water enters with valves closed	Not an inlet fault	Siphoning, or a false level reading
Water flows with the machine unplugged	Valve solenoid stuck open	Replace the valve; keep valves closed
Water stops the instant power is cut	Valve is being commanded open	Pressure hose, suds, level sensor
Drain cycle fails to empty	Drainage-driven, not inlet-driven	Pump filter, drain hose
Level falls when idle, rises again	Drain working but outpaced	Inlet side
Single bulky item, repeated fills	Rebalancing behaviour	Redistribute the load

If you have a Samsung

Expect OE, 0E, OC, 0C or OF — Samsung’s overflow family, meaning “there is too much water in the washer.” Note that some variants use the letter O and some the number zero; they are the same fault, so don’t waste time deciding which character you’re looking at (Samsung, “Samsung washing machine information and error codes”).
Samsung’s guidance covers leak sources (hoses, door gasket, drain hose, pump filter, levelling) and fill symptoms (no water, slow fill, not enough water) (Samsung, “Samsung washing machine is leaking”), water fill issues with Samsung washing machines).
Full breakdown: Samsung washer OC or OE overflow error.

If you have an LG

LG is the clearest example of the drain-pump behaviour described above, and it changes the order of the checks entirely.

Expect FE, E04 or E12. LG’s own wording explains the mechanism: “The FE/E04/E12 error indicates a problem with water overfilling. During normal operation, the drain pump is activated to prevent leaks” (LG front load washer — error code list).
Read that second sentence twice. It means LG machines counter an overfill by pumping — so on an LG, check drainage before the inlet valve, because a restricted drain is what turns a small excess into an emergency.
LG’s documented FE procedure follows the same logic: check whether extra water is entering via the detergent dispenser, unplug for 60 seconds, then run a Quick 30 to confirm the machine drains properly before assuming a part has failed.
Siphoning limit: LG documents that the drain hose should not be inserted more than 4 inches into the drainpipe (LG top load washer — troubleshooting an IE error code).
Water pressure: 14.5–116 PSI on front-load models (LG, “inlet hose installation — washing machine”); LG’s top-load guidance documents a narrower 14.5–80 PSI, so confirm your own form factor.
Repeated refilling with one bulky item is documented rebalancing behaviour rather than an inlet fault (LG, “LG top load washer — leaking”).

Confirm the repair

With the drum empty, restore the supply and run a short cycle.
Confirm the fill stops at the normal level rather than continuing to rise.
Confirm the machine drains fully at the end — as important as the fill on machines that counter overfills with the pump.
Confirm no extra water is added later in the same cycle.
Stay near the machine for the first cycle or two afterwards.

When to stop and call someone

Water continues entering with the supply valves confirmed closed.
An overfill code persists after the documented checks for your brand.
Drainage will not run clean even after clearing the filter and hose.
You smell anything electrical or see water near wiring.
The machine has overflowed and you are unsure whether water reached outlets, flooring, or the space below — that is a water-damage assessment, not an appliance repair.

FAQ

It isn’t filling at all — is that the opposite?

Yes, and it has its own codes. See washing machine not filling with water.

Why would a drain problem look like overfilling?

Because several machines run the drain pump automatically during an overfill to prevent leaks. If the drain path is restricted the pump cannot bring the level down, so a modest inlet excess presents as a level that only rises.

It overfilled once and has been fine since.

A one-off is a different, much narrower situation than a repeatable overfill. Watch it, but don’t start replacing parts.

There’s water on the floor but the level inside looks normal.

More likely an external leak — a hose connection, door gasket, or drain installation. See leaking during fill or leaking during drain.

Can I just let it run and see if it stops?

No. Continuous filling is an overflow risk. Shut the supply valves as soon as you notice it.

It refills repeatedly rather than filling continuously.

Usually an unbalanced or bulky single item triggering rebalancing. See washing machine stops mid cycle.

An OC or OE code is displayed while it overfills.

That’s the washer’s own overflow detection confirming what you’re seeing, and it comes with a specific documented response. See Samsung washer OC or OE overflow error.

An 8C code appears while the washer is overfilling.

That points at the sensing circuit directly rather than the valve, which changes the order of the checks. See Samsung washer 8C sensor error.