Caple dishwasher E4 error code
What E4 means on a Caple dishwasher
Anti-flood protection: internal leak or water detected in the base.
Meaning checked by NAC's engineers, 9 November 2026.
What our engineers say
On a Caple dishwasher, the E4 code is the anti-flood protection at work. It means water has been detected in the base of the machine, usually because something inside is leaking. You may notice beeping or flashing lights, the dishwasher not draining, water sitting in the base, or the machine stopping partway through a cycle.
Engineers sometimes find water that has spilled into the base through the overfill channels, which can happen if the machine has overfilled or dishes are sitting in the wrong position. They also sometimes find a leaking seal on the drain pump or the water softener, a damaged drain hose inside the machine, or a leaking circulation pump. Now and then a blockage in the pump stops the machine draining, so water overflows into the base.
An engineer will usually clear the water from the base, run the dishwasher to watch where it leaks from, and test the parts inside. Depending on what they find, they may clean out the overfill channels, remove a blockage, or replace the leaking pump, hose or seal. Parts often need 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
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