Oven Sensor Wiring Shorting? Bosch Range E104

What E104 means

The oven refuses to warm while the cooling fan blows hard: E104 says the wiring from the cavity temperature probe is shorting to ground. Bosch's own advice puts the probable mechanism ahead of the part, namely wires that are pinched or rubbing against bare metal. The range pauses oven heating and keeps the fan fast until two good readings return.

Common causes of E104

Harness squeezed against the chassis
Probe itself shorted inside
Harness insulation heat-damaged at the back of the cavity

✓ One safe check you can try

1. Turn the range's breaker off for two minutes and then back on. 2. Note whether E104 returns immediately or only after the oven has run a while; that distinguishes a constant short from an intermittent one. 3. Report it to us. 4. On a gas model, close the appliance gas valve before anyone moves the range, and leave moving it to us.

! Why to stop there

Dragging a range forward to reach the wires strains its gas fitting and cord.
A new probe will not help if the wire is what is being crushed.
A harness that is not re-routed correctly will short again after the repair.

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 Range codes

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E104E104 questions

Could my installer have caused this?

Quite possibly. A range shoved hard into its cutout is a classic way to crush the harness, which is why Bosch lists pinched wiring first. Tell us how it was installed if you remember.

Why is the fan so loud?

Full speed is the planned response when a temperature reading cannot be trusted. The range protects itself and its electronics by cooling down instead of guessing.

Will the oven work if I wait it out?

It resumes after two good readings. A short that comes and goes can start and stop again, so we would not plan dinner around it. Plan on a repair visit instead.