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Samsung Washing Machine Error Code AP

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ High Severity 🔧🔧 Moderate DIY

Aqua Protection activated — flood protection triggered

The most common cause of the AP error on a Samsung washing machine is door seal torn or pulled away from channel (~35% of cases); start with: tilt the machine to drain the base.

💰 DIY cost: $0–$90 👨‍🔧 Pro cost: $150–$380 Save $150+ by doing it yourself
Samsung Washing Machine error code AP on the display panel
How the AP code appears on a Samsung washing machine display

What Does Error Code AP Mean on a Samsung Washing Machine?

Aqua Protection activated — flood protection triggered.

The AP code fires when a float switch in the base pan detects standing water beneath the tub. The control interprets any accumulation as a potential flood, so it aborts the cycle, drains, and locks out operation until the pan is dry and the float drops. Unlike OE (drain/overflow at the tub) or DE (door lock), AP specifically reflects water pooling in the chassis base — from an external leak, a failed seal, or foam overflow — rather than a sensor or drainage timing fault.

Models affected: Front-load and select top-load Samsung washers equipped with the Aqua Stop / Aqua Protection base tray and float switch, including models such as WF45T6000AW, WF45R6100AP, WF42H5000AW, and WF50BG8300AV
What owners report: Owners commonly report AP appearing mid-cycle after using too much or non-HE detergent, where excess suds spill into the base and trigger the float even without a true leak. A frequent quick win is tilting the machine to drain the pan, letting it dry overnight, then cutting the detergent dose; if it recurs with no visible external leak, an internal seal or pump leak is more likely.

What Causes Error Code AP?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Door seal torn or pulled away from channel 35% of cases
  2. 2
    Detergent oversudsing causing foam overflow into base 30% of cases
  3. 3
    Supply hose connection leaking at machine inlet 20% of cases
  4. 4
    Drain hose loose at pump connection 15% of cases

How to Fix Samsung Washing Machine Error Code AP

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Tilt the machine to drain the base

    Turn off power. Carefully tilt the machine forward to drain water from the base pan. Have towels ready.

    ⚠️ Turn off water supply and disconnect power before tilting.
  2. 2

    Allow base to dry

    Leave machine upright with door open for several hours.

  3. 3

    Inspect door seal

    Check the rubber door gasket for tears, pulled sections, or mold damage.

    🔩 Samsung door gasket ($40–$90)
  4. 4

    Check detergent amount

    Excessive suds can overflow into the base. Use HE detergent, max 1 tablespoon.

  5. 5

    Check hose connections

    Inspect supply hose both ends, pump outlet, and drain hose connection.

How to Reset Error Code AP

Drain base, fix leak source, let it dry completely, then restart. The float sensor resets when the base is dry.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full Samsung washer reset guide → Enter diagnostic mode → Symptom guide: Washer leaking water →

Did this guide fix your appliance?

When to Call a Professional

If no visible external leak, the tub, drum bearing seal, or pump housing may have an internal leak requiring professional inspection.

Average professional repair cost for this issue: $150–$380

Related Error Codes

OE
Drain failure — water not draining
⚠ High Severity
DE
Door not properly closed or door lock failure
⚠ Medium Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Samsung Washing Machine:

🔩
Search PartSelect
Samsung Washing Machine repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Samsung Washing Machine Error Codes

4C Water supply not detected UE Unbalanced load detected LE Motor locked — drum cannot rotate HE Water heater error — water not heating to target temperature SUD Excessive suds detected tE Temperature sensor (thermistor) fault

Frequently Asked Questions

Can I keep using my Samsung Washing Machine when error AP appears? +
It is not advisable. The washing machine may still power on, but running it while AP is active can worsen the leak fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes AP on a Samsung Washing Machine? +
Across reported Samsung washing machine repairs, the most frequent is door seal torn or pulled away from channel (35% of cases), detergent oversudsing causing foam overflow into base (30%), then supply hose connection leaking at machine inlet (20%). Check them in that order before replacing any parts.
AP keeps coming back after a reset — what should I check next? +
A reset only clears the stored AP fault; if it returns, the leak problem is still present. Move on to the physical checks — tilt the machine to drain the base, then allow base to dry — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix Samsung Washing Machine error AP? +
A DIY repair typically runs $0–$90 in parts, versus $150–$380 for a professional service call, so handling it yourself saves around $150. Expect the work to take roughly 30–60 minutes.
Which Samsung Washing Machine models show error AP? +
AP is documented on Front-load and select top-load Samsung washers equipped with the Aqua Stop / Aqua Protection base tray and float switch, including models such as WF45T6000AW, WF45R6100AP, WF42H5000AW, and WF50BG8300AV. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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