Bosch Oven E104 Temperature Sensor Circuit Shorted to Ground

What E104 means

Where E101 describes a sensor that reports nothing, E104 describes the reverse: the cavity sensor circuit has shorted to ground. Bosch's suggested action looks first at the wiring, which may be squeezed or touching bare metal, and only then at the sensor. The oven reacts as it does to an open sensor, with the cooling fan at full speed and heating halted until two good readings arrive.

Common causes of E104

Sensor leads trapped against the cavity wall or frame
Temperature sensor shorted internally
Insulation on the sensor harness damaged by heat

✓ One safe check you can try

1. Turn the breaker off for a couple of minutes, restore it, and watch what the oven does. 2. Noticing whether the problem is steady or intermittent gives us a real head start. 3. Going further means following wires behind a built-in oven, so do not slide it out or take panels off.

! Why to stop there

Following wires behind a built-in oven means disconnecting a heavy unit from its supply.
Heat-damaged insulation can short again after a temporary fix.
Replacing the probe will not help if the wire is the part that is shorting.

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 E216Lower Cavity Meat Probe Socket Problem on a Bosch Oven, E216 E222Bosch Oven E222 Where the Lower Probe Reads Hotter Than Allowed 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

E104E104 questions

What is a short to ground?

It means the sensor wire is touching metal, so the signal drains away instead of reaching the control. The board reads that as a failed sensor circuit and shuts the heat off.

Could my installation have caused it?

Possibly. A wire that was pinched during installation or an earlier repair can short later as it heats and cools. We check for it on a visit.

How long is the repair?

It depends on where the wire is damaged and how easy it is to reach. We diagnose, give a written price before starting, and our work carries a 30-day workmanship warranty.