Limescale build-up in the heat pump.
Homeowner part this code names: dishwasher cleaner descaler.
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Likely causes
- Limescale, especially in hard water areas
How to fix E12: safe DIY steps
- Descale the dishwasher with a dishwasher descaler (Bosch sells its own); follow the product instructions
- To help prevent it, use softening salt if your dishwasher has a water softener function
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Bosch gives descaling as the fix. If E12 returns after descaling, contact Bosch Customer Support.
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Parts & tools for this fix
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Dishwasher descaler and cleaner: guide
In this code: Limescale, especially in hard water areas
Dishwasher softening salt: guide
In this code: To help prevent it, use softening salt if your dishwasher has a water softener function
See the guide for what to look for when buying one.
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