How to Fix Bosch Dryer Error E21

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: E21 Difficulty: Moderate

Problem: Control module failure; Fault with the dryer’s electronic components

⚖️ Repair Decision

❌ NOT WORTH FIXING

Parts over $250

How to Fix E21 Error (Step-by-Step)

Turn the dryer off, unplug it from the power source, wait for a few minutes, and then plug it back in to reset the electronics.
If the error persists after a power cycle, professional service is required to diagnose and replace the control module.
Turn the appliance off, wait about 2 minutes, then turn it back on.
Check for simple blockages (lint screen, drain path, or filter) and clean anything you find.
Make sure all doors, lids, and hoses are fully closed and seated correctly.
Run a short test cycle to see if the error clears.
Stop the cycle if the same error comes back right away, and avoid repeated restarts.

OEM Part #: 00670480

Estimated Market Price: $230-$835

Verified Compatible Alternatives:

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Appliance Type

Appliance Age

Estimated repair cost (parts, or parts + labor) Most DIY parts are $50–$250. If you have a quote, use the total.

Is it under warranty?

More options (for a better recommendation)

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Get the ‘Secret Service Mode’ Cheat Sheet for your Bosch model. Includes an easy-to-read list of every error code and quick diagnostic tips.