Oven
F04
The F04 error code on a Hotpoint oven indicates a fault with the oven’s temperature sensor (NTC probe) or the control board’s ability to read it — and while it sounds alarming, it’s one of the more straightforward faults to diagnose and often fix yourself.
What does this error mean?
F04 signals that the oven’s electronic control board has detected an abnormal reading from the NTC temperature sensor — the component that monitors the oven cavity temperature and tells the board when to heat or cut power. When the board receives a reading that’s out of the expected resistance range (either too high, too low, or no signal at all), it throws F04 and shuts down heating as a safety measure. In plain terms: the oven thinks it can’t trust its own temperature readings, so it refuses to operate.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£130 professional sensor repair; £150–£250 if PCB replacement is needed
🔍 Likely causes
🛠️ Step-by-step fix
Power cycle the oven: switch it off at the wall socket (or trip the circuit breaker), wait 5 minutes, then restore power. A temporary glitch can trigger F04 and a reset may clear it.
Check the oven door seal: a damaged or perished seal causes excessive heat retention, which stresses the sensor. Inspect the rubber gasket around the door — if it’s torn or compressed flat, replace it (seals typically cost £10–£25 and clip on without tools).
Locate and inspect the NTC sensor: it’s usually a small probe mounted on the back interior wall of the oven cavity, held by one or two screws. Unplug the oven, remove the probe, and visually inspect it for burn marks, cracks, or corrosion.
Test the sensor with a multimeter: at room temperature (~20°C), a healthy Hotpoint NTC sensor typically reads around 1,000–1,100 ohms. A reading of zero (short circuit), OL (open circuit), or wildly outside this range confirms the sensor is faulty and needs replacing.
Replace the NTC sensor if faulty: genuine Hotpoint/Indesit NTC probes cost £15–£35 online (use your model number to confirm compatibility). Unscrew the old probe, unplug the connector, fit the new one, and reassemble. This is a safe DIY task with the oven unplugged.
Inspect the wiring harness: with the oven unplugged, trace the sensor cable back toward the control board and check for pinched, burnt, or disconnected wires. Reseat any loose connectors firmly. If wiring is visibly burnt or damaged, stop and call a professional.
📞 When to call a professional
If replacing the NTC sensor does not clear the F04 code, the fault likely lies with the oven’s main control board (PCB) — this requires a professional to diagnose and replace, as it involves working inside the oven’s electrical housing. You should also call an engineer if you find burnt wiring, melted connectors, or any sign of electrical arcing inside the appliance. When you call, tell them the exact error code (F04), your oven’s full model number (found on the frame inside the door), and that you’ve already checked or replaced the NTC sensor.
⚖️ Repair or replace?
An NTC sensor replacement by a professional typically costs £80–£130 all-in; a PCB replacement ranges from £150–£250 depending on the model. If your Hotpoint oven is under 5 years old, repair is almost always worthwhile. If it’s over 8–10 years old and the PCB has failed, a new mid-range electric oven (£300–£500) is likely better value than a costly board replacement — especially if other components are also showing wear.