Appliance Spares
Quick answer: The most common cause of a Samsung washing machine overfilling, underfilling or stopping with a water-level fault is the pressure sensor — a small air-pressure sender that tells the control board how much water is in the tub. Replacing it is a straightforward job most people can do at home, but check the sensor’s air hose first: a split, kinked or crusted hose produces identical symptoms and costs nothing but ten minutes to fix. Here is how to tell them apart before you buy anything.
Not sure which one fits? Match your model number or check the sticker inside the door.
Last updated August 2026
What the pressure sensor actually does
A washing machine has no float. Instead, a small air chamber sits at the bottom of the tub with a thin hose running up to the pressure sensor on the cabinet. As water rises in the tub, it compresses the air trapped in that hose, and the sensor converts the pressure into an electrical signal the control board reads as a water level. Every fill decision the machine makes — when to stop filling, whether it is safe to heat, whether it is empty enough to spin — comes from that one reading.
Which is why one small part produces such a scattered set of symptoms when it drifts. The board is not broken and the valve is not broken; they are simply acting on bad information.
Which sensor fits your Samsung
Samsung used different sensors across its top loader families, calibrated to different tubs, so this is a match-by-model-code part. Find the model sticker — on a top loader it is on the back panel or under the lid on the cabinet rim; on a front loader it is inside the door opening on the cabinet rim. The full code matters, including everything after the slash: WA75F5S6DRA/SA is not interchangeable shorthand for any other WA75.
At least 2,700 individual appliance model numbers are served by two or more distinct parts in our catalogue. Same-looking machines, different internals — the code is the only thing that decides it.
| Your model code | Part number | The sensor to order |
|---|---|---|
 WA11M8700GV/SA, WA5471ABP/XAA | — | Samsung pressure sensor for WA11M8700GV/SA and WA5471ABP/XAA |
 WA80F5G4DJW/SA, WA11F5S5QWA/TC | — | Samsung pressure sensor for WA80F5G4DJW/SA and WA11F5S5QWA/TC |
 WA75F5S6DRA/SA, WA75G9TIP/XSA | — | Samsung pressure sensor for WA75F5S6DRA/SA and WA75G9TIP/XSA |
 WA70F5G4DJW/SA, WA70F5S2URW/SA | — | Samsung pressure sensor for WA70F5G4DJW/SA and WA70F5S2URW/SA |
 SW80USPIW/XSA, WA65F5S2URW/SA | — | Samsung pressure sensor for SW80USPIW/XSA and WA65F5S2URW/SA |
 SW65USPIW/XSA, SW75USPIW/XSA | DC32-30006V | Samsung pressure sensor for SW65USPIW/XSA and SW75USPIW/XSA |
 Model not listed — match the part number on your old sensor | DC96-01703G | Samsung washing machine pressure sensor matched by part number |
If your code is not there and the old sensor’s label does not match either, do not guess — sensors from different families plug in happily and then read the wrong level for your tub. Run the code through the part finder or send it to us.
The symptoms, and what each one means
Overfilling. The board thinks there is less water in the tub than there is, so it keeps the inlet valve open. A leaking air hose does this too — pressure escapes, the reading stays low, the water keeps coming. Overfilling deserves prompt attention: beyond the flood risk, every extra litre is heated water and pump time you are paying for, a point the household appliance guidance at energy.gov.au makes at length.
Underfilling or washing with too little water. The reverse error — the sensor over-reads, the board stops the fill early, and clothes come out poorly washed with detergent residue.
Refusing to fill at all. If the sensor reports water in a tub that is empty, the board may decline to open the valve, or sit trying to drain a machine with nothing in it. If your machine drains endlessly instead of filling, work through washing machine not draining — the fix for every brand first, because a genuinely part-full tub looks identical from the board’s point of view.
Refusing to spin. The machine will not go to high-speed spin while it believes water remains. A drifted sensor can leave a fully drained machine sitting there declining to spin — one of several causes covered in Samsung washing machine not spinning: causes and fixes.
Check the hose before you condemn the sensor
- Unplug the machine and turn off the taps.
- Get access — on most Samsung top loaders the sensor sits high in the cabinet behind the control housing; remove the rear screws and open the housing carefully.
- Follow the thin hose from the sensor down toward the tub. You are looking for splits (especially at the ends), kinks where the hose routes around the tub, and detergent crust inside the bottom chamber.
- Pull the hose off the sensor and blow gently down it. Air should move freely with a faint gurgle at the tub end. A blocked hose or chamber means the sensor never had a chance — clear it, refit, and retest before ordering anything.
- If the hose is clear and intact and the symptoms persist, the sensor itself has drifted. They are sealed units; there is nothing serviceable inside.
Replacing the sensor
With access already open, the swap is the easy part. Photograph the connector and hose orientation, unclip the electrical plug, ease the hose off the barb, and unclip or unscrew the sensor from the cabinet. Fit the new one, push the hose fully home onto the barb — a half-seated hose is a slow leak that recreates the original fault — and reconnect the plug. Route the hose exactly as it was, with no new kinks, then run a short cycle and watch the fill stop where it should.
If anything about the wiring looks unfamiliar for your model, the service documentation and user manual for your exact code are on Samsung support.
DIY or call a tradie
Do it yourself if: your model is in the table, you are comfortable opening the control housing with the machine unplugged, and the hose check above pointed clearly at the sensor. There is no water plumbing in this job and no mains wiring — it is clips, one plug and one hose.
Call a tradie if: the level symptoms come bundled with electrical ones (dead panel, tripping the safety switch), if a new sensor did not change the behaviour — that points to the board, where a tradie’s diagnosis is cheaper than parts roulette — or if the machine is under warranty, where opening the cabinet yourself is the wrong move entirely.
Frequently asked questions
Where is the model number on a Samsung washing machine?
Top loaders: back panel, or under the lid on the cabinet rim. Front loaders: inside the door opening on the cabinet rim. Photograph the model sticker and keep the whole code, including the part after the slash — /SA and /XSA machines are different builds.
Can I clean or recalibrate a pressure sensor?
No — they are sealed and not adjustable. What you can clean is everything around them: the air hose and the chamber at the tub, which is where most recoverable faults live. If the sensor itself has drifted, replacement is the fix.
Why does my machine only overfill occasionally?
Intermittent level faults are classic hose behaviour. A pinhole split leaks only under enough pressure, and a kink comes and goes as the tub moves with the load. That is why the hose inspection comes before the sensor every time.
The machine drained fully but will not spin. Is that really a level fault?
It can be. The board will not spin at speed while the sensor reports water present, so a drifted sensor strands an empty machine. Check for standing water in the tub first; if it is bone dry and still refusing, the sensor moves to the top of the list.
Will a sensor from a different Samsung model work if the plug fits?
Fitting the plug is not the standard — matching the calibration is. Sensors are tuned to a tub and fill range, and a mismatched one reads confidently and wrongly, which is worse than a dead part. Match the model code or the part number on the old sensor’s label.
Can I run the machine with the air hose disconnected to test it?
No. With the hose off, the board sees an empty tub no matter what is happening and will keep filling. Do the blow-through test with the machine unplugged, then refit the hose fully before any powered test.
Get the level reading you can trust
Photograph your model sticker and run the full code through the part finder, or send it to us with a photo of the old sensor’s label and we will confirm the match before you order. Orders placed before midday dispatch the same day 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.
