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Error Code

Thermador Dryer E90

E90 relates to a control or communication fault detected by the dryer.

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Reviewed by Marcus Cole · Last reviewed August 1, 2026

Error guide

Code overview

Marcus Cole Written by Marcus Cole Appliance Repair Content Specialist Published August 1, 2026 Updated August 12, 2026 Technically reviewed August 1, 2026
Error code E90
Appliance Dryer
Dryer service reference
Quick answer

E90 relates to a control or communication fault detected by the dryer.

Model compatibility: Thermador reuses codes across series and model years, so E90 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

Plain language

What this code means

The E90 code generally indicates the dryer’s electronics detected an internal control or communication problem. It points to a professional diagnosis rather than a user-serviceable step.

Signs

Symptoms you may notice

E90 displayed and cycle interrupted

Dryer may not start reliably

Controls behave inconsistently

Why it happens

Possible causes

A control-board fault

A communication or wiring issue

A related sensor problem

Before you call

Safe checks you can make

These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.

Confirm the dryer has stable power at the outlet

Check that the lint filter and accessible airflow are clear

Note whether the code appears at start or mid-cycle

Important safety warning. Dryers involve high voltage and heat. Internal control diagnostics must be handled by a qualified technician.

Please avoid

What not to attempt

  • Do not open the control housing
  • Do not access internal high-voltage wiring
  • Do not run repeated cycles to force it to work
Get help

When to call a technician

If E90 persists after confirming power and clear airflow, book a diagnosis to evaluate the control safely.

FAQ

Frequently asked questions

References

Sources & references

  • Appliance user manual — fault display section
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