Air Fryer
E3
The E3 error code on a Cosori air fryer indicates an overheating fault — specifically that the internal temperature has exceeded a safe operating limit. It’s a safety cut-out, not a catastrophic failure, and in most cases you can resolve it yourself in minutes.
What does this error mean?
Your Cosori air fryer has a built-in thermal sensor that monitors the internal temperature throughout cooking. When that sensor detects temperatures above the safe threshold — typically triggered by restricted airflow or a sensor fault — the appliance shuts down and displays E3. Think of it as the appliance protecting itself (and your kitchen) from a potential fire hazard. The unit will not operate again until the issue is resolved and the appliance has cooled down.
Est. repair cost
£40–£100 professional repair; £8–£20 DIY thermistor part (only if comfortable with basic appliance disassembly)
🔍 Likely causes
🛠️ Step-by-step fix
Unplug the air fryer immediately and leave it on a heat-safe surface to cool for at least 30 minutes — do not attempt to use it while hot
Check the placement: the unit needs at least 10cm of clear space on all sides and above. Move it away from walls, cabinets, or other appliances if needed
Remove the basket and drawer, then clean all vent holes on the back and underside using a soft brush or dry cloth to remove grease and food debris
Inspect the basket for overfilling — if you were cooking a large batch, divide it into smaller portions and cook in separate rounds
Once fully cooled, plug the unit back in and run a short test cook (5 minutes at 180°C with an empty basket) — if E3 reappears immediately, the temperature sensor or heating element is likely faulty
If the error clears and the unit works normally, monitor it over the next few uses. If E3 returns consistently, the thermal sensor (thermistor) may need replacing — this is a low-cost part but requires opening the unit, so consider professional repair or replacement
📞 When to call a professional
If E3 persists after a full cool-down, a thorough clean, and correct placement, the internal thermistor or heating element is most likely the cause — and replacing either involves opening the appliance’s casing and working near electrical components. Stop DIY at that point and contact Cosori UK support (the brand offers a 2-year warranty on most models) or a local small appliance repair technician. Tell them the exact error code (E3), the model number (found on the base), and whether the unit gets unusually hot to the touch during normal use.
⚖️ Repair or replace?
A thermistor replacement by a technician typically costs £40–£70 in the UK; a heating element repair can run £60–£100 including labour. Cosori air fryers retail between £60 and £130 new, so if your unit is over 2–3 years old and out of warranty, replacement is often the smarter financial call. If the appliance is under 2 years old, pursue the Cosori warranty first — it’s free and covers manufacturing defects.