What it is
Bosch lists limescale build-up in the heat pump, especially in hard water areas, as the cause of E12 and says to descale the dishwasher with a dishwasher descaler (Bosch sells its own) following the product instructions.
How to choose
- Follow your manufacturer's guidance on allowed products. Choose a cleaner labelled for dishwashers and follow its package directions.
How to use it
- Run the cleaner in an empty dishwasher following the product directions.
Safety firstNever mix cleaners. Follow product and manual instructions.
Capacitors can hold a charge after the power is off. Safety terms.
Where to buy
These are Amazon links. Product page links go to one specific listing whose title we read on Amazon; we do not say it fits your model. Search links open search results, which change. Always confirm your model number and the part number in your manual.
Product pages
Searches by type or size
Search: Dishwasher cleaner descaler, general searchSearch: Dishwasher cleaner tabletsSearch: Water hardness test strips
Searches by brand
Search: Bosch dishwasher cleaner descalerSearch: GE dishwasher cleaner descalerSearch: LG dishwasher cleaner descalerSearch: Samsung dishwasher cleaner descaler
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Codes that mention it
Error codes whose own causes or steps name this part or check.
Bosch
Per-brand lists: Bosch dishwasher.