Bosch Dishwasher E4 Error Code: Causes and Fixes
Quick answer: Spray arm performance low
What you’ll notice
Cycle pauses; spray arm performance has fallen below the minimum threshold.
Bosch
Dishwasher
Code E4
low severity
Bosch models: Bosch dishwashers have a three-stage filter: coarse screen, flat micro-filter, and cylindrical fine filter under the lower spray arm. Remove and clean all three together. Bosch drains actively using a pump — any standing water in the sump at mid-cycle is a blockage indicator, not normal residual water.
Common causes
- Spray arm holes blocked by limescale or food
- Object in the rack obstructing spray arm rotation
- Low inlet water pressure
Step-by-step fix
- Remove and clean the spray arms (see F6 steps).
- Check that no tall items in the rack block arm rotation.
- Spin both arms by hand before starting the next cycle.
Tools you may need
ToothpickSmall brush
Prevention
- Check spray arm clearance when loading the machine.
When to stop DIY
Replace spray arms if cleaning does not restore normal rotation.
FAQ
What does E4 mean on Bosch dishwasher?
E4 usually indicates: Spray arm performance low.
Can I keep using the appliance with E4?
Use caution. Severity is low. Replace spray arms if cleaning does not restore normal rotation.
How long does this fix usually take?
Typical first-pass troubleshooting takes 10–15 minutes.