Bosch Range F31, the Shorted Twin of F30

What F31 means

Where F30 flags an open sensor circuit, F31 flags the opposite on an older Evolution range: the board sees almost no resistance across the oven sensor. To decide between a bad probe and a bad wire, the manual unplugs the sensor and measures it alone. A good one still reads 1080 to 1110 ohms, so anything near zero there condemns the probe.

Common causes of F31

Probe shorted internally
Wiring shorted somewhere between the probe and the board
Worn wire touching the chassis

✓ One safe check you can try

Home measurement is not practical, but a note helps. 1. Turn the breaker off. 2. Write down whether the oven ran hot or would not heat at all, since a shorted sensor looks like an impossibly high temperature to the board. 3. Give us that when you book.

! Why to stop there

Reaching the plug means moving a heavy slide-in range.
On gas models the space behind the fascia sits over the manifold, no place for guesswork.
If a chafed wire is behind it, a new probe alone will not end the short.

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.

→Same appliance

Other Range codes

F91Bosch Range F91 Means the Unlock Attempts Ran Out F92Bosch Range F92: Oven Believes the Door Is Open F93Bosch Range F93 Is the Lock-Side Twin of F90 F94Bosch Range F94: Door Lock Attempts Exhausted F11Bosch Range F11 Can Be as Simple as a Pressed Key F12Bosch Range F12: Control Module Cannot Recognize Its Own Processor F13Bosch Range F13 Signals Corrupted Stored Settings F30Bosch Range F30: Reading 1080 to 1110 Ohms on the Oven Sensor

F31F31 questions

Can a household multimeter test the sensor?

The measurement is simple, but reaching the plug means shifting a heavy range and working in a cramped space that, on gas models, sits above the manifold.

Will this damage anything else?

Usually not. The board stops heating instead of acting on an impossible reading, so the oven goes cold rather than racing away. Nothing else in the oven is stressed by it.

Why is my oven cold with F31?

The board believes the oven is far hotter than it is, so it declines to heat. The sensor circuit, not the heating parts, is the likely culprit.