ERROR CODE EXPLAINED
Thermador Dishwasher
Thermador Dishwasher E12 Error Code
What it means
Limescale has built up in the dishwasher heat pump.
Try this first
- Descale the dishwasher using a dishwasher-safe descaler.
- Use dishwasher softening salt if the appliance has a water softener.
- Retry the dishwasher.
Can I keep using it?⚠ Limescale buildup
Repair usually required?✅ Often user-correctable
If the error keeps returning
If the condition returns after troubleshooting, qualified service 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.