Bosch Oven Error F21

⚡ Quick Answer: The Bosch oven error F21 indicates a malfunction related to the key panel, often caused by a short in the cancel key or contamination on the control p... ✅ DIY Fixable

What Does Error F21 Mean?

The Bosch oven error F21 indicates a malfunction related to the key panel, often caused by a short in the cancel key or contamination on the control panel. This can lead to erratic temperature readings and unresponsive buttons, affecting cooking results. If you see F21 on your oven screen, it's important to address this issue promptly to restore proper function.

Common Symptoms:

  • F21 displayed on oven screen
  • Buttons on control panel not responding or stuck
  • Cancel key input behaving abnormally

Possible Causes

  • Key panel/cancel key short or contamination (medium)
  • User interface/control board fault or wiring issue (low)

How to Fix Error F21

DIY Fix Power reset and control panel cleaning

  1. Turn off oven power at the mains or circuit breaker.
  2. Wait ~30 seconds and restore power to reset internal electronics.
  3. Gently clean the control panel and buttons with a dry, lint‑free cloth to remove any dirt or moisture.
  4. Attempt to operate the oven and see if the F21 clears.

Technician Only Diagnose and repair key panel / control interface

  1. Disconnect power to the oven.
  2. Remove outer case to access control panel assembly.
  3. Inspect key panel contacts and wiring for corrosion, damage or loose connections.
  4. Test key switches and interface board with a multimeter.
  5. Replace defective control panel components or interface board as needed.

Parts needed: Control panel/key switch assembly, User interface board, Wiring harness

🛑 When to Call a Pro:
  • If F21 persists after power reset and cleaning
  • If control panel buttons are unresponsive or intermittent
  • If error recurs immediately after power cycling

Technical Specifications

wattage N/A
component Temperature Sensor
resistance 1000-1100 ohms
part_number 00420413
voltage_rating 120V AC

Common Questions

What does F21 error mean on bosch oven?

F21 indicates a key panel malfunction, often resulting in unresponsive buttons and inconsistent cooking.

Can I fix bosch oven F21 error myself?

Yes, you can try a power reset and clean the control panel gently to resolve the issue.

How much does it cost to fix F21 error?

The estimated repair cost for the F21 error ranges from $100 to $350, depending on parts and labor.

When should I call a technician for F21?

Call a technician if the F21 error persists after a reset or if the control panel remains unresponsive.

Data last verified: 2026-01-16

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