Oven
F05
The F05 error code on an Indesit oven indicates a fault with the oven’s temperature sensor (NTC probe) or its wiring circuit. It’s a moderately serious fault — the oven will typically stop heating or refuse to start until the issue is resolved.
What does this error mean?
F05 tells you that the oven’s control board is receiving an abnormal signal from the NTC temperature sensor — the component that monitors the internal oven temperature. Either the sensor is reading a temperature outside the expected range, or the signal has been lost entirely. Without a reliable temperature reading, the oven’s safety logic shuts down heating to prevent overheating or damage.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£130 professional sensor repair; £150–£250 if control board replacement is needed
🔍 Likely causes
🛠️ Step-by-step fix
Power cycle the oven: switch it off at the wall, wait 5 minutes, then turn it back on. A transient glitch can occasionally trigger F05 and a reset clears it.
Check your model number (found on the oven door frame or back panel) and look up the specific NTC sensor part number for your exact Indesit model before ordering any parts.
Locate the NTC sensor — on most Indesit fan ovens it sits inside the oven cavity, usually at the back wall or top-rear corner, and is held by one or two screws. Visually inspect it for obvious burn marks, cracks, or melted plastic.
Inspect the wiring harness running from the sensor to the back of the appliance. Look for scorch marks, frayed insulation, or connectors that have pulled loose. Re-seating a loose connector is a safe DIY fix.
If the sensor looks damaged or wiring is intact but the error persists, replace the NTC sensor. Replacement sensors cost £15–£35 online (search by your model number). Disconnect power, unscrew the sensor, unplug the connector, fit the new part, and reassemble. This is a safe DIY repair for a competent homeowner.
Do NOT attempt to open the main control board housing or test live components yourself — if replacing the sensor doesn’t resolve F05, the fault has moved beyond safe DIY territory.
📞 When to call a professional
If replacing the NTC sensor doesn’t clear the F05 code, the control board is likely at fault — this requires a qualified appliance engineer. Also call a professional if you find burnt or heavily damaged wiring inside the appliance, as rewiring an oven incorrectly is a fire risk. When you call, tell the engineer: ‘Indesit oven showing F05, NTC sensor already replaced, suspect control board fault.’
⚖️ Repair or replace?
A professional repair for an F05 fault (sensor replacement by an engineer) typically costs £80–£130 including parts and labour. If the control board needs replacing, expect £150–£250. For any Indesit oven over 8–10 years old, weigh this against a new mid-range built-in oven costing £250–£400 — if the board has gone on an older appliance, replacement is usually the smarter spend.