U4 Minor Easy DIY

Fisher & Paykel DishDrawer U4 — Fault in the Other Drawer

Fisher & Paykel Dishwasher · Error code U4

What U4 Means

U4 on a double DishDrawer means there is a fault in the OTHER drawer that is disabling this one. Resolve the other drawer's fault first.

Symptoms

  • One drawer will not run
  • U4 on the display

Common Causes

1
A fault present on the other drawer

An E-fault in the opposite tub disables both.

2
Controller link between the two tubs

A loom/connection issue between the drawers.

How to Fix It

  1. Check the other drawer for its own fault code and clear it first.
  2. Power the unit off at the wall for a minute, then retry both drawers.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Dishwasher Multimeter / Test Tools View on Amazon→

More Fisher & Paykel Dishwasher Codes

F30 F30 — Flood Switch Activated F40 F40 — Water Flow Error F50 F50 — Electronics Error F90 F90 — Data / Electronics Error FA0 FA0 — Electronics / Power Supply Error FC0 FC0 — Motor Fault

All Fisher & Paykel codes → All dishwasher codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.