ErrorBase
Independent technical referenceOfficial site
  • Appliances
  • Dryers

E90

Bosch E90 on a tumble dryer: electronics fault

Verified with sources1 sourceReviewed Oct 3, 2026
Technician coming? See the 2 steps they must show you
Front-loading tumble dryer
Sweetie candykimCC0Image source

Risk level

Medium

Proceed carefully and stop if the check is unclear.

Urgency

Medium

Quick answer

On a Bosch tumble dryer, E90 means a fault with the electronics. Bosch says only an experienced engineer can fix it: switch it off, unplug it and book a repair with the model number to hand.

Safety first

Stop and check this first

  • Do not open the dryer or touch the electronics: it runs at mains voltage. If you notice a burning smell or a hot plug, unplug it and stop using it.

Safe checks you can perform

  • Power off and appliance details
  • Dryer power socket
  • Fault memory reading

Leave these tasks to a qualified professional

  • Do not attempt this professional task: Electronics and wiring diagnosis
  • Do not attempt this professional task: Operating test after the repair

What a technician must be able to justify

Technician visit

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

  1. Electronics and wiring diagnosis

    What they doThe technician reads the fault memory and measures connectors and wiring with the power off before deciding to replace electronics.

    They must show youthe history reading and a photo of the damaged connector or part.

    In writingthe diagnosis, any replaced part with its reference and the reason.

  2. Operating test after the repair

    What they doThe technician runs a full programme and checks E90 does not return.

    They must show youa full cycle with no code.

    In writingthe programme tested, the result and the date.

Before accepting a part or repair

Nothing has been shown yet. Do not accept a part swap based on the code alone.

Follow these steps

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

  1. Power off and appliance details

    No special tools

    Who:
    you, no tools.
    How:
    switch the dryer off, unplug it and note E90 and the model number (E-Nr) on the door rating plate.
    Result that matters:
    having the details the service will ask for.
    If there was a burning smell, sparks or a hot plug:
    do not plug it back in and tell the technician.
    If nothing else happened:
    book the visit with the details ready.
    Evidence to keep:
    photos of the display and the rating plate.

    Evidence: Dryer Error Code E90 | Bosch

  2. Dryer power socket

    No special tools

    Who:
    you, without opening anything.
    How:
    check the dryer is plugged straight into the wall, with no extension lead or power strip, and the plug is not damaged.
    Result that matters:
    a direct connection in good condition.
    If it was on a strip or extension lead:
    tell the technician; it helps the diagnosis.
    If the socket is fine:
    that outside factor is ruled out.
    Evidence to keep:
    a photo of the socket and plug.

    Evidence: Dryer Error Code E90 | Bosch

  3. Fault memory reading

    Tools required

    Who:
    a Bosch service technician.
    How:
    they connect diagnostic equipment or use service mode to read the dryer fault history.
    Result that matters:
    which fault the control logged and when.
    If the history points to a component:
    measurement focuses on that part.
    If only E90 shows with no detail:
    the technician must measure wiring and electronics before replacing anything.
    Evidence to keep:
    the history reading, printed or photographed.

    Reading the fault memory or opening the dryer is technician work. The appliance runs at mains voltage.

    Evidence: Dryer Error Code E90 | Bosch

Still not solved

If the error persists, stop here. See what the technician must do and show you.

Where this code applies

A code is meaningful only inside the right product and version context.

Primary scope

System
Appliances
Brand
Bosch
Product type
Dryers

Known code variants

  • AEG E90 error
  • AEG Fehler E90
  • AEG lavadora E90
  • AEG lavadora E91
  • AEG lavadora E92
  • AEG lavadora E93
  • AEG lavadora E94
  • AEG lavatrice E90
  • AEG lavatrice E91
  • AEG lavatrice E92
  • AEG lavatrice E93
  • AEG lavatrice E94
  • AEG lave-linge E90
  • AEG lave-linge E91
  • AEG lave-linge E92
  • AEG lave-linge E93
  • AEG lave-linge E94
  • AEG Waschmaschine E90
  • AEG Waschmaschine E91
  • AEG Waschmaschine E92
  • AEG Waschmaschine E93
  • AEG Waschmaschine E94
  • AEG washer E90
  • AEG washer E91
  • AEG washer E92
  • AEG washer E93
  • AEG washer E94
  • Bosch dryer E90
  • Bosch dryer E90 electronics fault
  • Bosch E90 error tumble dryer
  • Bosch E90 secadora
  • code erreur AEG E90
  • E90 AEG lavadora
  • E90 AEG lavatrice
  • E90 AEG lave-linge
  • E90 AEG Waschmaschine
  • E90 AEG washer
  • error AEG E90
  • error E90 secadora Bosch
  • errore AEG E90
  • secadora Bosch E90 fallo electrónico

What it means

Bosch defines E90 as a fault with the electronics and says only an experienced engineer can eliminate it. That covers the control electronics, the internal wiring and the components they drive. The code does not identify which part has failed, so E90 alone is not enough to justify replacing the board without measuring and reading the fault history.

Warnings and stop conditions

  • Higheditorial warning

    Do not open the dryer or touch the electronics: it runs at mains voltage. If you notice a burning smell or a hot plug, unplug it and stop using it.

    Evidence: Dryer Error Code E90 | Bosch

Symptoms and causes

Probable causes · in order

  • Fault in the control electronicsPossible

    Only told apart by reading the fault memory and measuring; nothing visible outside separates it from the other causes.

    Evidence: Dryer Error Code E90 | Bosch

  • Internal connection or wiringPossible

    A loose or damaged connector can give the same code; the technician sees it when checking the wiring with the power off.

    Evidence: Dryer Error Code E90 | Bosch

  • Component driven by the electronicsPossible

    If the board and wiring are fine, the technician looks for the component causing the fault the electronics detects.

    Evidence: Dryer Error Code E90 | Bosch

Virtual technician

Does E90 still appear after these checks?

Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.

Start diagnosis

Sources and technical references

  1. 1

    Dryer Error Code E90 | Bosch

    BSH Home Appliances / Bosch · official_doc

Sources: Dryer Error Code E90 | Boschreviewed 2026-10-03 · verified

Was this entry useful?