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Error code reference

AEG Washer Error Code C3

Aqua Control fault

AEG codesAEG washer codes

Aqua Control fault – float switch (f16) has detected water in the base of the machine, triggering the drain pump directly and halting the program.

First step from the service manual

Check for leaks; once the float switch resets, press Start/Pause to resume the program.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What C3 means on a AEG washer

The C3 error code on an AEG washer indicates an Aqua Control fault. This system is a flood protection mechanism built into the base of the machine. When water accumulates in the drip tray at the bottom of the appliance, a float switch designated as F16 rises with the water level and closes an electrical circuit that signals the control board. The control board responds immediately by activating the drain pump to remove water from the drum and suspending the active wash program entirely.

The Aqua Control system is designed to prevent serious water damage by detecting even small amounts of leakage before it can spread across a floor. The float switch F16 sits in the base tray and remains in a low position during normal operation. Any water that escapes internal hoses, pumps, seals, or the drum itself collects in this tray and lifts the float. Until that water evaporates or is removed and the float drops back to its resting position, the machine will not resume normal operation.

Diagnosing this fault requires identifying the source of the water that reached the base tray. Leaks can originate from multiple points including door seals, inlet hose connections, internal hose clamps, the pump housing, or the tub-to-pump drain path. Once the leak source is addressed and the base tray is dry, the float switch resets automatically. At that point, pressing Start/Pause allows the program to continue. If the float switch itself is faulty and triggers C3 without any actual water present, the switch will need testing or replacement.

Source: manufacturer service documentation.

Common causes of C3

  1. 01

    Leaking door seal or gasket

    Part replacement

    Tears, cracks, or debris buildup on the door boot seal can allow water to drip past the door and run down into the base tray during a wash cycle. Inspect the seal visually and feel for damage around its entire circumference.

  2. 02

    Loose or damaged internal hose connection

    Part replacement

    Hoses connecting the drum, pump, and dispenser drawer can develop loose clamps or small splits over time, allowing water to drip into the base. Tip the machine carefully and inspect all visible hose joints for moisture or mineral deposits indicating a slow leak.

  3. 03

    Drain pump housing leak

    Part replacement

    The pump body or its sealing points can crack or develop leaks, particularly if debris has caused an obstruction that built up pressure. Check the pump housing and filter cap area for signs of water seepage.

  4. 04

    Detergent drawer or dispenser housing overflow

    Wiring / connection

    Using too much detergent or a clogged dispenser housing can cause water and foam to overflow internally and find its way to the base tray. Check the dispenser compartment for blockages and reduce detergent quantity if foam is excessive.

  5. 05

    Faulty float switch (F16)

    Part replacement

    If no water is visible in the base tray and no leak source can be found, the F16 float switch itself may be stuck in the triggered position or electrically faulty. The switch would need to be tested for proper operation and replaced if it is signaling incorrectly.

See the test procedure for each cause

Frequently asked questions about C3

What does C3 mean on a AEG washer?
C3 on an AEG washer means the Aqua Control flood protection system has been triggered. The float switch F16, located in the base tray of the machine, has detected water collecting at the bottom of the appliance. In response, the washer automatically activates the drain pump and stops the wash program to prevent further water damage. The root cause is a leak somewhere inside the machine that allowed water to reach the base tray.
How do I fix the C3 error on my AEG washer?
Start by unplugging the machine and inspecting it for the source of the leak. Common locations include the door seal, internal hoses, and the drain pump area. Once you have identified and repaired the leak, allow the base tray to dry completely so the float switch F16 can drop back to its resting position. After the float resets, plug the machine back in and press Start/Pause to resume your program.
Is it safe to keep using my AEG washer when C3 is showing?
You should not continue using the washer until the cause of the leak has been found and fixed. The C3 code exists specifically to stop operation and protect your home from water damage. Running the machine before addressing the leak could result in a larger flood, electrical hazards, or further damage to internal components.
Will resetting my AEG washer clear the C3 error?
A simple power reset will not permanently clear C3 if water remains in the base tray, because the float switch F16 will still be in the triggered position. The error will only clear once the base tray is dry and the float drops back down. If the underlying leak is not repaired, the fault will return during the next wash cycle.
How much does it cost to repair an AEG washer showing C3?
Repair costs vary depending on the source of the leak. A door seal replacement typically falls in the range of $50 to $150 including parts and labor. Internal hose repairs or pump replacements can range from $100 to $250 or more depending on the specific component and labor rates in your area. If the float switch F16 itself is the faulty component and requires replacement, that is generally a lower-cost repair, often in the $60 to $120 range.

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