E202 — Internal Control Fault
Bosch's official US oven/microwave error-code page documents only E11 (touch keys/condensation) plus generic 'E and a number' catch-alls that instruct disconnecting power and calling Bosch support. A specific 'E202' is not separately documented. The 'internal control fault' explanation below is not confirmed on Bosch's US consumer page — verify against your model's manual.
- Keep using it?
- Limited use only
- DIY difficulty
- Hard
- Verified against
- bosch-home.com ↗
How to fix it
- Power off at the breaker for 10 minutes; restore and retry once — a soft fault may clear.
- Remove the rear panel and visually inspect the main control for burn marks or bulged capacitors.
- Verify supply voltage to the board is in spec (240 V across the heater feed legs).
- If E202 returns at every power-up, the main control needs replacement.
- Confirm part number against the model tag — Bosch boards are NOT cross-compatible across series.
Why it happens
Typical signs: Oven won't heat at all · E202 on power-up or after a few seconds · Display otherwise normal · Sometimes paired with burned smell at control
- Failed relay or relay driver Power surge or age killed the heating relay.
- Corrupted EEPROM Brownout during a write left config invalid.
- Burned PCB trace Often visible at the relay or terminal area.
- Failed power supply on the board Logic rail collapsing under load.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- Bosch oven main control board Common replacementAmazon →
More Bosch oven codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.