Samsung dishwasher 4C error code
What 4C means on a Samsung dishwasher
Water inlet fault: no water entering the appliance.
Meaning checked by NAC's engineers, 9 November 2026.
What our engineers say
On a Samsung dishwasher, code 4C points to a water inlet fault, which means no water is getting into the machine. You may also see a water supply warning, find the dishwasher will not fill or will not start, or notice beeping and flashing lights.
What engineers sometimes find is a fault with the water inlet hose, the hose that brings water into the dishwasher and has a safety valve built into it. The valve may be getting power but fail to open, or let only a brief trickle through before stopping. Some homeowners also hear a clunking sound before the code appears.
An engineer will usually check whether power reaches the valve when a wash starts and listen for water coming in. They will also make sure water is reaching the hose from the supply, and test the valve itself to see whether it has failed. The usual repair is to replace the inlet hose and its valve as one part, then run a cycle to confirm the machine fills, washes, heats and drains properly. The new hose often has to be ordered and fitted at a second visit.
Written by our engineers from NAC's own jobs.
Faults this code turns up with
What our engineers found and fixed for each, from NAC's own repair records.
What we fixed. We'll add what our engineers found, the parts they fitted and what customers typically paid once enough of these repairs are confirmed. How we work out our figures.
Before you check anything yourself
- Switch the dishwasher off and unplug it, or turn it off at the isolator switch, before you touch anything. Our guide to safely isolating an appliance walks you through it.
- An error code tells you where to look, not that it's safe to take the dishwasher apart. Don't remove panels or covers to get at the parts it points to: that's an engineer's job.
- If it involves the mains supply, sealed parts, or you're not confident at any point, stop and book a qualified engineer rather than risk injury or further damage.
Rather leave it to us?
- Fixed-price quote before any work starts
- Same or next-day visits where available
- UK-wide engineer coverage