The F03 error on your Indesit Oven means the oven’s temperature sensor (probe) has failed or is sending an incorrect signal to the control board. This usually stops the oven heating properly or shows an error message on the display, and it often needs a replacement part rather than a simple reset.

Error code F03
Meaning Oven temperature sensor (probe) fault or wiring fault
Severity Medium — oven may still work intermittently but temperature control is unreliable
Time to fix 20–45 minutes
Tools needed Multimeter, screwdriver

What the F03 error means

Indesit ovens use a temperature sensor, sometimes called a probe or thermistor, to monitor the internal cabinet temperature and relay that reading to the electronic control board. The F03 code appears when this sensor sends a reading outside the expected range, or when the control board detects no signal at all, which points to a broken sensor or a loose or damaged wire connecting it.

This is a common fault on ovens that have been used heavily over several years, since the sensor and its connector are exposed to constant heat cycles. It’s a similar type of component fault to what causes an Indesit Washing F03 Error Code on washing machines, where a sensor sends bad data to the main board.

Common causes

  • Faulty temperature sensor (probe) that has failed internally
  • Loose or corroded wiring connector at the back of the oven
  • Damaged sensor wire from heat exposure over time
  • Control board fault misreading a working sensor
  • Poor earth connection causing electrical interference
  • Moisture or grease build-up around the sensor terminals

How to fix the F03 error

  1. Power off and cool down: Switch off the oven at the wall and let it cool completely before opening the back panel or touching any internal parts.
  2. Check the wiring connector: Locate the sensor at the back or side of the oven cavity and check its connector is firmly seated and free from corrosion or scorch marks.
  3. Test the sensor with a multimeter: Disconnect the sensor and measure resistance across its terminals. Compare the reading to the manufacturer’s spec sheet; a reading of zero or infinite ohms usually means it’s failed.
  4. Replace the sensor if faulty: Fit a genuine replacement Indesit temperature sensor matching your oven model, then reconnect the wiring securely.
  5. Reset the oven: Turn the power back on at the wall and run a short test heat cycle to see if the F03 code clears.
  6. Call an engineer if it persists: If the code returns after replacing the sensor, the control board itself may be at fault and should be checked by a qualified appliance engineer.

FAQ

Can I still use my oven with an F03 error showing?
It’s best not to. The oven may overheat or undercook food because the temperature reading is unreliable, so it’s safer to switch it off until it’s fixed.

How much does an Indesit oven temperature sensor cost to replace?
The part itself is usually inexpensive, but total cost depends on whether you fit it yourself or hire an engineer for labour.

Will unplugging the oven reset the F03 code?
A power reset may clear the display temporarily, but if the sensor or wiring fault is still there, the code will come back once the oven heats up again.