Thermador Dishwasher E0105: Start-Up Check Rejects the Heating Circuit

What E0105 means

Shortly after power-up the dishwasher halts and E0105 appears. On newer boards that count in four digits, this is Thermador's wording for the situation that older machines report as E04: during its own opening check, the heating electronics returned a reading the board refuses to accept. Loading, detergent and the door play no part in it.

Usual causes of E0105

A loose or corroded plug on the harness between the board and the heating circuit
A heating-circuit part whose measured value sits outside the expected range
A control board that can no longer interpret the heater circuit it is meant to watch

✓ A safe check worth trying

1. Leave all panels closed, since this is not an owner-level test. 2. Look on the door edge for the label and copy down the model number and the FD number. 3. Record E0105 exactly as displayed. 4. Phone us with those details; Thermador treats this number as a support matter and publishes no checklist for it.

! Why you should stop here

The area under test is wired at line voltage, so exploring it while the machine is energized invites injury.
No reset procedure is published for this number, and cycling the power again only postpones the measurement a technician would take with a meter.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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E0105E0105 questions

The dishes still come out warm. Does that mean the heater is fine?

Not necessarily. The check may be rejecting the reading taken by the watching circuit rather than the element, and a meter on the board side is the way to tell them apart.

Does E0105 describe the same problem as E04?

Thermador words them identically, so we regard them as one problem displayed by two generations of control board. The approach to diagnosing it does not change.

Where does a technician begin?

With the harness plugs, because a poor contact is the cheapest explanation and quick to rule out. Next come readings across the heater circuit, and then the board itself.