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Error Code

Fisher & Paykel DishDrawer U4

This guide explains U4 in plain language for Fisher & Paykel DishDrawer appliances (DishDrawer — F/U display fault codes). It is independent repair guidance — not official manufacturer service instructions.

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Reviewed by Ethan Cole · Last reviewed August 10, 2026

Ethan Cole Written by Ethan Cole Appliance Repair Content Specialist Published August 10, 2026 Updated August 11, 2026 Technically reviewed August 10, 2026

Content status: Verified

Error code U4
Appliance DishDrawer
Affected model series DishDrawer (F/U fault-code generation) — confirm the rating-plate model before acting
Quick answer

Fisher & Paykel DishDrawer alert U4: typical presentation, safe checks, and when to call an independent tech.

Model compatibility: Fisher & Paykel reuses codes across series and model years, so U4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

Plain language

What this code means

Fisher & Paykel may reuse display labels across generations. For U4 on DishDrawer — F/U display fault codes, compare the on-screen text with your model’s error table.

Signs

Symptoms you may notice

  • The DishDrawer control panel displays U4 during or after a wash cycle.
  • The cycle may pause, stop early, or fail to start while U4 is shown.
  • An indicator light or beep may accompany the U4 display.
Before you call

Safe checks you can make

These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.

  • Check that the drawer is fully closed and latched before restarting.
  • Confirm the water supply tap is fully open and not kinked or restricted.
  • Check that the drain hose is not kinked and the drain path / air gap is clear.
  • Switch the DishDrawer off at the wall, wait about 60 seconds, then switch back on and retry once.
  • Record the full model and serial number from the rating plate for reference.

Important safety warning. Do not open internal panels, remove covers, or access wiring or the control board. Do not bypass the drawer safety interlock. If you notice water pooling near electrical parts, a burning smell, or sparks, switch off power at the wall and call a professional immediately.

Get help

When to call a technician

If U4 returns after the safe checks, pause further DIY and book an independent diagnosis with Fisher & Paykel Appliance Repair — bring the model/serial and a photo of the display.

Code still active?

Have this Fisher & Paykel alert verified on site

Repeating fault codes usually need platform-specific testing. We confirm the cause and price the fix before work begins.

FAQ

Frequently asked questions

References

Sources & references

Code still active?

Have this Fisher & Paykel alert verified on site

Repeating fault codes usually need platform-specific testing. We confirm the cause and price the fix before work begins.

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