Bosch dishwasher: error E20E21
Code E20 / E21 on a Bosch dishwasher display means: heating pump blocked or heater fault.
- Meaning
- Heating pump blocked or heater fault
- Check first
- Wait 10 minutes and try again.
- Repair shop
- 270–650 zł
Most common causes
- Heating pump covered in limescale or blocked
- Damaged heating element
- Clogged filter
What you can check yourself
Turn off the water and unplug the dishwasher.
Wait 10 minutes and try again.
If the error comes back, stop using the dishwasher and report it to a repair service. This code usually means a damaged part.
- the error keeps coming back after these checks,
- water is leaking or you smell burning,
- the appliance trips the circuit breaker.
More detail in our guide: Dishwasher not cleaning well →
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What does error E20 mean on a Bosch dishwasher?
Code E20 / E21 means: heating pump blocked or heater fault. The most common causes: heating pump covered in limescale or blocked, damaged heating element, clogged filter.
Can I keep using the dishwasher with error E20?
If the error goes away after the checks above, yes. If it keeps coming back, water leaks, you smell burning or the breaker trips, stop using it and call a repair service.
Other codes: Bosch dishwasher
- E15water in the dishwasher base (Aquastop)
- E24drain problem: clogged filter or hose
- E25blocked drain pump
- E22clogged filter
- E09water heating problem
- E14 / E17water supply problem
- E27 / E90supply voltage problem
- E01 / E02 / E03 / E04 / E05electronics or control module fault
- E06 / E8000door sensor fault
- E12limescale in the heating pump or too little salt
- E16 / E18 / E32water supply problem
- E23drain pump problem
A code can mean different things on different models and years. Always check the manual or the manufacturer's support page too. Repair prices are approximate, for repair shops in Poland.