Written by
Marcus Hale Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU4
ApplianceDishwasher
Quick answer
U4 on a DCS DD24 DishDrawer means a fault in the other drawer prevents use of this drawer.
Model compatibility: DCS 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
Fault in the other drawer preventing use of this drawer.
With a double DD24 DishDrawer, U4 shows that the other drawer has a fault that stops this one from running.
Where to look
Check the other drawer and attend to its fault code. Once that fault is dealt with, U4 is not the problem to chase.
Codes you may find on the other drawer
It could be U1 (fill fault), F1 (flood switch activated) or F9 (electronics malfunction).
DCS dishwasher service in Los Angeles
Say U4, the other drawer’s code and the model number. Call (310) 616-5236 for DCS dishwasher service in Los Angeles, and see the dishwasher repair details.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your DCS appliance?
Book a specialist visit for a clear estimate and approval before any repair.
