Bosch Oven E302, Control Module Overheating Itself

What E302 means

A heat sensor on the control board keeps watch over the board's own temperature, and E302 means it went past the permitted limit. In response the oven switches the elements off and pushes the cooling fan to maximum so the electronics can recover. Heating returns once the cavity has dropped to 212 degrees Fahrenheit. Any self-clean that was underway stays blocked until someone resets the control.

Common causes of E302

Cooling fan stopped or turning sluggishly
Vent trim around the oven blocked, bent or installed incorrectly
Stuck heating relay adding more heat inside the cabinet than intended

✓ One safe check you can try

1. Let the oven cool down. 2. Check the trim strips above and below the door for blockages and damage; a trim kit bent out of shape during installation turns out to be a very common reason. 3. Do not stuff anything into the gaps around the oven. 4. If the code returns, call us.

! Why to stop there

A control board that overheats repeatedly can fail for good.
A stuck relay generates extra heat, so treating this as only an airflow problem can let it get worse.
Removing trims in a built-in installation can disturb the cabinet fit and the electrical connection.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Oven codes

E223Lower Probe Reads Colder Than Allowed (Bosch Oven E223) E226Bosch Oven E226 After the Lower Door Latch Signal Is Lost E309Control Module Failed Its Program Memory Check: Bosch Oven E309 E310Bosch Oven E310 Signals a Settings Memory Failure on the Control Module E312The Control Board's Own Heat Sensor Died (Bosch Oven E312) E314Bosch Oven E314 When the Cancel or Off Key Reads Stuck E414Off Key Failure Logged Behind the Scenes, Bosch Oven E414 E201Bosch Oven E201 on a Double Wall Model, Lower Cavity Sensor Reads Open

E302E302 questions

Does a loud fan mean something is wrong?

The high-speed fan is the oven's cooling response to this error. If it persists after the cavity cools, the board may be running hot for another reason.

Can poor installation cause E302?

Yes. Trims that are crushed or misfit restrict airflow around the control module. We check the installation on a visit and tell you what we find.

Is it safe to keep baking?

We would not. An overheating board risks lasting damage, so let it cool and have the cause checked. We give a written price before any repair.