The E16 error on your Bosch Dishwasher means the aquastop or water inlet system has detected a leak or fault, causing the machine to shut off the water supply as a safety measure. This is usually caused by a water leak in the base of the unit, a faulty inlet valve, or a stuck float switch, and it needs checking before you run another cycle.
| Error code | E16 |
|---|---|
| Meaning | Water leak detected or aquastop safety valve triggered |
| Severity | High — the dishwasher will not fill or run until resolved |
| Time to fix | 20–45 minutes |
| Tools needed | Torch, towel, adjustable spanner, multimeter (optional) |
What the E16 error means
Bosch dishwashers use a float switch and aquastop system in the base tray to detect standing water. When water is found where it shouldn't be, the control board locks the inlet valve and displays E16 to prevent flooding. It's a protective response rather than a random glitch, so there is almost always a physical cause somewhere in the water system.
Common causes
- A small leak from a hose connection or door seal collecting in the base tray
- A faulty or stuck float switch that thinks there's water even when the base is dry
- A failing aquastop valve on the inlet hose
- Condensation build-up during long or hot cycles being mistaken for a leak
- A cracked or loose spray arm seal allowing water to escape the tub
- Debris trapped under the float, stopping it from sitting correctly
How to fix the E16 error
- Turn off power and water — Switch off the dishwasher at the wall and shut the water supply valve before inspecting anything.
- Check the base tray for water — Remove the lower front panel and use a torch to check for standing water or dampness around the float switch.
- Dry and reset the float — Mop up any water, dry the float switch fully, and gently move it up and down to confirm it moves freely.
- Inspect hoses and seals — Check the inlet hose, drain hose, and door gasket for cracks, loose clips, or wear that could be causing a slow leak.
- Test the inlet valve — If you have a multimeter, check the aquastop valve for continuity; replace it if it fails to open or close properly.
- Restart the dishwasher — Power it back on, run a short rinse cycle, and watch the base tray for a few minutes to confirm the leak is fixed.
FAQ
Can I just clear the E16 error and keep using the dishwasher?
You can reset it, but if there's a genuine leak it will likely return, and running the machine with a leak risks water damage to your kitchen floor.
Why does E16 appear even when the base tray looks dry?
Condensation or a very slow drip can trigger the float switch briefly and then evaporate before you check, so it's worth watching the machine during a full cycle.
Is E16 expensive to fix?
Most cases involve a loose hose clip or dirty float switch, which cost nothing to fix. A replacement aquastop valve is a moderate cost part if that's the actual fault.
If you're troubleshooting other Bosch appliances around the house, guides like Bosch Drill Won'T Start: Causes and How to Fix It, Bosch Drill Overheating During Use: Causes and How to Fix It, Bosch Drill Chuck Won'T Tighten: Causes and How to Fix It, and Bosch Drill Battery Not Connecting: Causes and How to Fix It cover similar step-by-step fixes for common Bosch tool faults.
