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Fisher & Paykel Dishwasher Error Code U1

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

Flood protection activated — water in base

The most common cause of the U1 error on a Fisher & Paykel dishwasher is door seal damaged (~35% of cases); start with: drain the base tray.

💰 DIY cost: $0–$100 👨‍🔧 Pro cost: $200–$450 Save $200+ by doing it yourself
Fisher & Paykel Dishwasher error code U1 on the display panel
How the U1 code appears on a Fisher & Paykel dishwasher display

What Does Error Code U1 Mean on a Fisher & Paykel Dishwasher?

Flood protection activated — water in base.

The flood system detected water in the DishDrawer base tray and tripped the float/sensor, so the unit stops to prevent a cabinet leak. A damaged drawer seal, loose internal hose, oversudsing, or cracked tub is the usual source.

What Causes Error Code U1?

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 damaged 35% of cases
  2. 2
    Internal hose connection leaking 35% of cases
  3. 3
    Oversudsing 20% of cases
  4. 4
    Tub crack 10% of cases

How to Fix Fisher & Paykel Dishwasher Error Code U1

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

    Drain the base tray

    Turn power off and carefully tilt the unit forward over towels to drain water from the base tray.

    ⚠️ Turn off power before tilting.
  2. 2

    Inspect the drawer seal

    Check the drawer gasket for tears, flattening, or debris that lets wash water escape into the base.

    🔩 F&P door seal ($35–$80)
  3. 3

    Check internal hoses

    Inspect pump, fill, and drain hose connections inside the drawer for drips or loose clamps.

  4. 4

    Reduce suds

    Use only dishwasher detergent and correct dose; oversudsing can overflow the drawer into the base.

How to Reset Error Code U1

Drain the base tray, fix the leak source, dry the sensor area, then restore power. U1 clears when the float/sensor resets and no new water enters the base.

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

Symptom guide: Dishwasher leaking →

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When to Call a Professional

If the base refills and no seal, hose, or sudsing issue is visible, an internal crack or drawer component leak needs Fisher & Paykel authorized inspection.

Average professional repair cost for this issue: $200–$450

Related Error Codes

U4
Not draining — drain fault
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Fisher & Paykel Dishwasher:

🔩
Search PartSelect
Fisher & Paykel Dishwasher repair parts
🔧
Search RepairClinic
Step-by-step video guides

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

More Fisher & Paykel Dishwasher Error Codes

U7 Heating failure — water not reaching target temperature

Frequently Asked Questions

Can I keep using my Fisher & Paykel Dishwasher when error U1 appears? +
It is not advisable. The dishwasher may still power on, but running it while U1 is active can worsen the leak fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes U1 on a Fisher & Paykel Dishwasher? +
Across reported Fisher & Paykel dishwasher repairs, the most frequent is door seal damaged (35% of cases), internal hose connection leaking (35%), then oversudsing (20%). Check them in that order before replacing any parts.
U1 keeps coming back after a reset — what should I check next? +
A reset only clears the stored U1 fault; if it returns, the leak problem is still present. Move on to the physical checks — drain the base tray, then inspect the drawer seal — 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 Fisher & Paykel Dishwasher error U1? +
A DIY repair typically runs $0–$100 in parts, versus $200–$450 for a professional service call, so handling it yourself saves around $200. Expect the work to take roughly 30–60 minutes.

Sources & References

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

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