Tumble Dryer
F04
The F04 error code on an Electrolux tumble dryer indicates a fault with the NTC temperature sensor — the component that monitors heat inside the drum. It’s a moderately serious fault that will stop your dryer from running safely until it’s resolved.
What does this error mean?
The F04 code tells you that the dryer’s control board has detected an abnormal reading from the NTC (Negative Temperature Coefficient) sensor, which continuously monitors drum temperature during a cycle. Either the sensor is reading a temperature outside its expected range, or the electrical signal from it has dropped out entirely. The dryer shuts down as a precaution to prevent overheating or a fire risk.
Est. repair cost
£10–£25 DIY NTC sensor replacement; £80–£150 for a professional repair including callout and labour
🔍 Likely causes
🛠️ Step-by-step fix
Reset the dryer first: switch it off at the wall, leave it unplugged for 5 minutes, then restart a short cycle. A one-off electrical glitch can sometimes trigger F04 and a reset clears it.
Clean the lint filter thoroughly: remove it, rinse under a tap if it’s a mesh filter, and let it dry completely before reinserting. Do this after every cycle going forward.
On condenser models, remove and clean the condenser unit: slide it out from the bottom front panel, rinse it under the shower or a tap until the water runs clear, and leave it to dry before refitting. Do this every 4–6 weeks.
Check the drum isn’t overloaded: a full load should allow clothes to tumble freely. Reduce load size and run a test cycle to see if F04 returns.
Inspect the NTC sensor wiring (only if you’re comfortable with basic appliance DIY): with the dryer unplugged, access the sensor — usually located near the heating element at the rear — and check that the connector is firmly seated and the wires show no visible burning or fraying. Reconnect any loose plug and retest.
Replace the NTC temperature sensor if the fault persists: genuine or compatible Electrolux NTC sensors cost £10–£25 online. Unplug the dryer, swap the sensor, refit, and test. If you’re not confident doing this, stop here and call an engineer.
📞 When to call a professional
If the F04 error returns after cleaning filters, resetting the dryer, and checking connections, the NTC sensor or control board likely needs professional diagnosis and replacement. You should also call an engineer immediately if you notice any burning smell, scorch marks near the heating element, or visible wire damage. When booking, tell the engineer: ‘My Electrolux tumble dryer is showing an F04 error code — I’ve cleaned the filters and reset it, but the fault persists. I’d like the NTC sensor and wiring harness checked.’
⚖️ Repair or replace?
A professional repair for an F04 fault — covering callout, labour, and parts — typically costs £80–£150 in the UK. If your dryer is under 5 years old, repair is almost always worth it. If it’s over 8 years old and this isn’t the first fault, a new mid-range condenser or heat pump dryer (£300–£500) is likely the smarter long-term investment, particularly given the energy savings of newer heat pump models.