Bosch Refrigerator F1 Shows the Freezer Sensor Reads Open or Shorted

What F1 means

On Bosch French door bottom-freezer models, F1 in the diagnostic display points to the freezer compartment sensor. The display may read Lo, meaning the sensor is disconnected, or Hi, meaning it has shorted. The repair manual's test is a resistance reading at connector CN14 on the main board, and if the sensor reads open or shorted the fix is to replace the freezer sensor itself.

Common causes of F1

Freezer sensor that has failed open or shorted
Sensor connector that has come loose at the main board
Sensor wiring damaged inside the compartment liner

✓ One safe check you can try

1. Open the freezer drawer and make sure nothing keeps it from closing fully. 2. Check that the vents at the back are not blocked by packed food. 3. Rearrange if needed, give it several hours, and note whether F1 stays. A crowded or ajar freezer can mimic a sensor complaint, but a code that stays means a technician is needed.

! Why to stop there

Reading resistance at CN14 means getting into the board area, which is not something to do with the refrigerator plugged in.
A wire problem in the liner can look the same as a dead sensor, so replacing the sensor alone may not help.
Prying at the liner to reach the sensor can crack it and let insulation get damp.

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 Refrigerator codes

C1Bosch Refrigerator C1 Means the Compressor Runs but the Cabinet Will Not Cool F3Bosch Refrigerator F3 Shows a Freezer Defrost That Timed Out r3Bosch Refrigerator r3 Shows a Fresh Food Defrost That Timed Out ESBosch Refrigerator ES Means a Dispenser Button Reads as Pressed drBosch Refrigerator dr Means the Fresh Food Door Reads as Open dFBosch Refrigerator dF Means the Freezer Drawer Reads as Open E21Bosch Refrigerator E21 Means the Dispenser Module Stopped Responding r1Bosch Refrigerator r1 Marks a Fresh Food Probe With No Usable Signal

F1F1 questions

What do Lo and Hi mean on the display?

Lo means the sensor is disconnected, and Hi means it has shorted. Either way the control cannot read the freezer temperature correctly, so it is working blind.

Is the freezer still keeping food cold?

It might, but right now the control is only guessing. Check with a thermometer, and move food to another freezer if it starts to soften.

How long will the repair take?

Typically one visit when we have the sensor with us. We diagnose first, give you a written price, and begin only after you approve it.