Leak Detected in the Base (Aquastop)

What it means

On Siemens front-load washing machines this code means the Aquastop leak protection system has detected water in the base tray under the machine. The washer cuts off the water supply, the drain pump may keep running to reduce flood risk, and washing does not resume until the leak is dealt with. The same number can mean something else on other brands.

Models covered: Siemens front-load washing machines; newer models show E codes, older ones F codes.

Related codes: E17E18F21

Symptoms4

• E23 shows and washing stops at any stage.
• The drain pump keeps running even after the program is stopped.
• A puddle under the washer or at its front corner.
• Foam marks at the detergent drawer or around the door.

Possible causes6

• The pump filter cap is loose or its rubber ring is missing.
• Excess foam leaking from the detergent drawer due to the wrong detergent or dose.
• A torn door seal or an object caught in it.
• A loose hose connection or a cracked internal hose.
• A leak from the drain pump, inlet valve or tub.
• A faulty float switch alarming with no real water (less common).

How to diagnose5

1. Turn off the water tap immediately, then unplug the washer.
2. Make sure the filter cap is tight, and inspect the door seal and detergent drawer for water or foam marks.
3. Review the detergent type and dose, since excess foam is a common cause.
4. A technician unplugs the washer before removing its cover, looks for the water source, then runs a supervised test after reconnecting.
5. The washer is not tilted and the base is not dried to clear the code until the source is found and fixed; the float is then checked for free movement.

How to fix5

1. Tighten the filter cap or replace its rubber ring.
2. Use a front-loader detergent at the dose suited to water hardness and load.
3. Have the technician replace the leaking door seal, hose or connection.
4. Replace the drain pump or inlet valve if the leak comes from them.
5. After the repair, dry the base, run a short program while watching the floor, and confirm the code does not return.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost stays low for the filter cap or foam, and rises with an internal hose, pump or door seal replacement.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions