Written by
Marcus Hale Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU1
ApplianceDishwasher
Quick answer
U1 on a DCS DD24 DishDrawer is a fill fault; check the water supply and spray arm, then call service.
Model compatibility: DCS reuses codes across series and model years, so U1 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
Fill fault.
U1 means the DD24 DishDrawer has a fill fault, so the drawer is not taking in water as expected.
Checks from the user guide
Turn the DishDrawer water supply on.
Make sure the spray arm sits on the impeller and can rotate. If the drawer is full of water, empty it manually.
If U1 persists, call service.
Related
A fault in the neighbouring drawer is reported as U4. Water-related trouble can also show as F1, the flood switch code.
DCS dishwasher service in Los Angeles
Share U1, the model number and which checks you finished. 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.
