No verified model list is available for this code
A manufacturer code/support source may be available, but no exact supported model has been documented for this record. Do not treat the code as a model-specific diagnosis without checking the manual.
Verify the full model number against the manufacturer manual.
Open manufacturer sourceWhat does this code mean?
Limescale accumulation in the heat pump requires descaling.
Source scope: Compatibility with specific model numbers has not been established. Always check your exact appliance manual.
This code and broad meaning appear in manufacturer support material. Applicability to your exact model is not yet proven. Confirm your full model designation in the official manual.
Open manufacturer sourceWhat can you try?
- 01
Confirm the limescale warning
On supported Bosch models the code points to scaling in the heat pump. Check water hardness and dishwasher salt settings in the manual.
What the result means: Poor softening may contribute to deposits.
- 02
Use the Bosch-approved descaling process
Follow the official Bosch dishwasher descaler product directions and the appropriate maintenance cycle; never mix cleaning chemicals.
What the result means: Check the next normal cycle for the warning.
- 03
Seek service if it persists
Provide the E-Nr and exact code without opening the heat pump.
What the result means: Descaling will not repair every possible fault.
Stop immediately for leaks, smoke, burning smell or electrical danger. For gas leaks, leave the area and call local emergency services.
How do you actually fix this?
Start with safe checks. Some codes have no safe home fix; in that case we explain what the professional repair actually involves.
Practical fixes you can try
- Check dishwasher salt and water-hardness settings per the manual. Use only a compatible maintenance/descaling product.
- Run the prescribed empty maintenance cycle if supported. Never mix vinegar, acids or aggressive cleaning chemicals.
- If the heating fault remains, do not open the heat pump or flush it with chemicals yourself.
If it persists, how is it actually repaired?
A technician checks heater performance, water softening and scaling, performs approved descaling or repairs the proven faulty heating component.
How do you know it is fixed? The scaling/heating warning should not return and hardness settings should be correct.
Safety and warranty: Warranty terms depend on manufacturer, model and local law. Damage caused by unauthorised disassembly or improper repair may be excluded. Live electrical work, gas, refrigerant circuits and sealed cabinets require qualified professionals; this is not a DIY instruction for those tasks.
Evidence: The manufacturer link above supports the broad code meaning. The repair pathway is a general technical diagnostic explanation, not a confirmed failed-part diagnosis for every model.
Manufacturer source
Independent safety-focused explanation with a manufacturer link. Possible causes are not verified part diagnoses; the code may vary by model or region.
Open original manufacturer guidance ↗