Bosch Oven E123 Appears When the Probe Reads Too Cold

What E123 means

Here the probe reports too cold a number, lower than the control is willing to accept, and the oven keeps its elements off until the probe is pulled. The first suspect is the food: a probe pushed into something still frozen does read very low, and legitimately so. If the food was thawed, attention shifts to the probe's own electrical resistance, to loose plug connections, and to a pinched cable.

Common causes of E123

Probe stuck into food that is frozen or still partly frozen
Probe sensing element worn out and reading too low
A loose plug or a squeezed cable on the probe circuit

✓ One safe check you can try

1. Pull the probe from the food and from its socket. 2. Let it sit until it reaches room temperature. 3. Retry with fully thawed food; frozen food is the one cause you can rule out with no tools. 4. If E123 returns with thawed food, stop using the probe and call us.

! Why to stop there

Probe wiring runs through the cavity wall near heating parts, so tracing it is not a home job.
A cold-reading probe and a loose connection give identical codes, and replacing the wrong part wastes money.
Pulling hard on a pinched lead can snap it inside the socket.

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 E206Lower Oven Door Would Not Lock (Bosch Oven E206) E207Bosch Oven E207 and a Lower Cavity Door That Refuses to Unlock E215Lower Cavity Overheated and Locked Itself: Bosch Oven E215 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

E123E123 questions

Can I cook frozen food with the probe?

Not reliably. A frozen center reads colder than the control accepts. Thaw the food first, or skip the probe and check doneness with a separate thermometer.

Is it the oven or the probe?

If it appears only with frozen food, it is neither. If it shows with thawed food too, the probe or its connection is the likely cause, and we can test both.

Is a replacement probe expensive?

Typically a probe is a modest part. We check the circuit first so you pay for the right thing, and you approve a written price before any work starts.