The reading in two sentences
E100 on this oven means an electronics fault has occurred, with no component named by the manufacturer — that is what the manufacturer published for it, and no more. If the oven completes a bake normally after a power cycle you can use it, but stop if the code returns during cooking. One of the checks below is an owner check, and the rest of the work is behind a panel.
Error codes
Reference| Code | Meaning |
|---|---|
| E100 | An electronics fault has occurred. |
What else is happening when this shows
- The code appears at power-up before anything is selected — That is the control finding the fault during its own start-up check.
- Behaviour that changes between attempts — An inconsistent fault points at a connection or a supply rather than a failed component.
- NEAR MISS — no display and no response at all — That is a supply fault rather than an electronics code, and it starts at the breaker.
What triggers E100, most likely first
- A latched transient with no live fault behind it — It goes first because the code names nothing: a brief supply disturbance or an interrupted start leaves a stored reading that a full minute at the breaker clears for good.
- A loose connector or a chafed harness at the control — It ranks here because it is the commonest physical cause: a plug not fully home fails a self-check intermittently, which is exactly how these codes behave.
- A genuinely failed control board — Last, and deliberately so: it is the most expensive answer, and the four causes above imitate it exactly while costing nothing to eliminate.
The order to work through
- Note whether the code follows heavy or steamy cooking — A pattern that tracks use rather than time points at the environment round the control.
- Power the oven down at the breaker for a full minute and time how long it stays clear — That interval is the only diagnostic this code offers, and it costs nothing but attention.
- Cut power at the breaker for a full minute and restore it — This is the first and most informative step: stored and live faults behave differently from here on.
The reset and the checks that follow it
- Give the appliance its own outlet with nothing shared — Remove strips, adaptors and extension leads from the path before anything is ordered.
About 10 min
- Cut power for a full minute, then run one ordinary bake and write down exactly what happens — Whether it completes, where it stops and what the display does are the three things a technician will ask for.
About 60 min
- Let a damp or steamed appliance dry out and retest — If the code follows a hot or humid cycle, leave it off and open until dry, then try again.
About 60 min
- STOP HERE — do not keep resetting a code that returns at once — A code that comes straight back is live, and resetting round it removes the evidence a technician needs.
Before a panel comes off
Safety
Unplug the oven or switch off its breaker before any panel comes off — a capacitor can hold a charge after the power is off. The cavity and the glass stay hot long after the heat is off, so let everything cool first. On a gas model, if you smell gas, leave the building and call the gas utility from outside.
Where an owner check ends
Call straight away if you smell hot plastic, see scorching at a connector, or the appliance behaves unpredictably rather than simply stopping.
Other codes on a Bosch oven
What is deliberately not here
Treat this as the general Bosch oven reading. It stops short of anything model-specific — part numbers, harness colours, connector layouts and service-mode entry — because those differ by family and a technician takes them from the rating plate rather than from a code. A family- or model-specific page, where one exists, is linked from the code index below and is the closer answer.
Links: - [Bosch oven error codes](/blog/bosch-oven-error-codes)
Next steps
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
