The F04 error on your Indesit Oven means the appliance has detected a fault with the oven temperature sensor (probe), usually because it is reading a temperature outside the normal expected range. This often points to a wiring issue or a failed sensor rather than something you can reset away. Turning off the power and checking the sensor connection is the first sensible step before assuming a full replacement is needed.

Error code F04
Meaning Oven temperature sensor (probe) fault or wiring/connection problem
Severity Medium — the oven may still work but heating control becomes unreliable
Time to fix 15–45 minutes
Tools needed Screwdriver, multimeter (optional, for testing sensor resistance)

What the F04 error means

Indesit ovens use a temperature sensor (sometimes called an RTD probe) to monitor the internal cavity temperature and feed this back to the control board. If the reading falls outside the expected range, is missing entirely, or shows a short circuit, the control board raises the F04 code to prevent unsafe or inaccurate heating. It’s a safety measure rather than a random glitch, so it usually indicates a genuine hardware issue somewhere between the sensor and the main board.

Common causes

  • Faulty or degraded temperature sensor (probe) inside the oven cavity
  • Loose, corroded, or disconnected wiring connector at the sensor or control board
  • Damage to the sensor wiring from heat exposure over time
  • Moisture or condensation affecting the sensor connection
  • Main control board fault misreading a normal sensor signal
  • Recent oven cleaning or installation disturbing the sensor wiring

How to fix the F04 error

  1. Power off and reset: Switch off the oven at the wall for 2–3 minutes, then power back on to see if the error clears. This won’t fix a hardware fault but rules out a temporary glitch.
  2. Inspect the sensor wiring: With the power disconnected, open the back panel or access point and check the sensor’s wiring connector for looseness, corrosion, or visible damage.
  3. Reseat the connector: Unplug and firmly reconnect the sensor connector to ensure a clean contact, then restart the oven and test.
  4. Test the sensor resistance: Using a multimeter, check the sensor’s resistance against the manufacturer’s spec (usually printed in the service manual). A reading far outside spec means the sensor needs replacing.
  5. Replace the temperature sensor: If the sensor fails the resistance test, fit a genuine Indesit replacement part matched to your model number.
  6. Call a qualified engineer: If the error persists after replacing the sensor, the control board itself may be at fault and should be checked by a professional.

FAQ

Can I keep using the oven with an F04 error showing?
It’s best not to. The error means temperature readings can’t be trusted, so the oven may overheat or undercook food unpredictably until it’s fixed.

Is the F04 error the same across all Indesit appliances?
No. F-codes mean different things depending on the appliance type. For example, this differs from the Indesit Washing F04 Error Code: Causes and Fixes, which relates to a washing machine drain fault rather than an oven sensor.

Do I need a professional to replace the temperature sensor?
Many homeowners can do this themselves with basic tools if they’re comfortable working safely with a disconnected appliance, but if you’re unsure, a qualified engineer is the safer option.