Bosch Coffee Machine CALC Error: Descaling Required
What Does Bosch Coffee Machine CALC Mean? The CALC indicator is a maintenance reminder telling you it’s time to descale. Limescale from hard water builds up in the heating system and eventually slows coffee flow and affects taste. Run the automatic descaling program with an approved descaling solution. Prevention Descale every 2-3 months in hard […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. The machine is safe but coffee quality will degrade. Descale as soon as possible.
Can I reset the code?
Yes. The CALC indicator clears automatically after a successful descaling cycle.
When to stop immediately?
Stop if you notice: Coffee barely drips out, Machine takes extremely long to brew.
Symptoms You May Notice
CALC or descale light illuminates
The descaling indicator appears on the display or a dedicated light turns on.
Coffee flow slows down
Brewing takes longer than usual as scale restricts water flow through the heater.
Coffee tastes bitter
Mineral buildup affects water temperature and extraction, giving coffee a bitter or flat taste.
Possible Causes
Normal limescale buildup
Hard water minerals naturally accumulate in the heating system during normal use.
DIY PossibleSafe Checks You Can Do
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1
Run the descaling program
Use the automatic descaling program with a Bosch-approved descaling solution. Follow the on-screen prompts exactly.
Takes about 30 minutes. Do not interrupt the descaling cycle once started.
When to Call a Professional
Contact a qualified technician if:
- Scale buildup is too severe for home descaling
- Heater is partially blocked
- Multiple descaling cycles have no effect
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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