E20
Bosch Oven
Severity:What Does This Error Mean?
E20 on a Bosch oven means the pyrolytic self-clean cycle has been interrupted because the oven cavity temperature exceeded the safe limit. The oven shuts down and the door remains locked until the oven cools. Do not force the door open.
Affected Models
- Bosch HBG Series (Pyrolytic)
- Bosch HBA Series (Pyrolytic)
- Bosch Series 6 and 8 Built-In Ovens with Pyrolysis
- Bosch HBS573BS0B
Common Causes
- Heavy soiling in the oven caused excessive combustion during pyrolysis, generating abnormal heat
- Temperature sensor reading incorrectly — causing the oven to run hotter than intended
- Poor kitchen ventilation causing ambient temperature around the oven to rise
- Cooling fan fault — not keeping the oven exterior cool during the pyrolytic cycle
- Control board fault — not regulating the pyrolytic temperature correctly
How to Fix It
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Do not attempt to open the door.
The door lock is a safety feature during pyrolysis. The door will unlock automatically once the oven cools to a safe temperature — typically 30-60 minutes after E20.
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Once the oven is fully cool and the door unlocks, clean any remaining ash from the cavity.
A very heavy grease load can cause E20 on the first pyrolytic cycle. Wipe out the bulk of the ash, then run a shorter or lower-intensity self-clean cycle.
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Ensure the kitchen is well ventilated during the next self-clean cycle.
Open windows and run the extractor fan. High ambient temperature reduces the oven's ability to reject heat and can contribute to E20.
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If E20 recurs on a normally soiled oven, call a Bosch technician.
Recurring E20 without heavy soiling suggests a temperature sensor or cooling fan fault.
When to Call a Professional
If E20 occurs regularly during self-clean cycles and not just after very heavy soiling, call a Bosch technician. A recurring E20 suggests a temperature sensor or control board fault.
Frequently Asked Questions
How hot does a Bosch oven get during pyrolytic self-clean?
Bosch pyrolytic ovens reach approximately 480 degrees C (900 degrees F) during the self-clean cycle. At this temperature, grease and food residue are incinerated to ash. This is why the door locks — it is a genuine safety requirement.
How long does the pyrolytic cycle take on a Bosch oven?
A full pyrolytic cycle typically takes 2.5 to 3.5 hours, depending on the soiling level selected. Bosch pyrolytic ovens usually offer 3 levels: light, medium, and heavy. The door remains locked throughout and for 30-60 minutes afterwards until the oven cools.