ERROR CODE EXPLAINED
Bosch Dishwasher
Bosch Dishwasher E12 Error Code
What it means
The dishwasher detected limescale buildup in the heat pump.
Try this first
- Use an appropriate dishwasher descaling product.
- Follow the descaler instructions carefully.
- If your dishwasher has a water-softener system, make sure dishwasher salt is being used as required.
- Run the recommended descaling cycle.
Can I keep using it?⚠ Descale before normal use continues
Repair usually required?✅ Usually no
If the error keeps returning
If E12 returns after the dishwasher has been properly descaled, further diagnosis may be required.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.