Air Fryer
E4
The E4 error code on a Tower air fryer indicates an overheating fault — the internal temperature has exceeded safe operating limits. It’s a protective shutdown, not a death sentence, and in most cases you can resolve it yourself in minutes.
What does this error mean?
Tower air fryers use a built-in thermal sensor to monitor the cooking chamber temperature. When that sensor detects heat above the safe threshold — typically around 230–260°C internally — the appliance triggers an E4 code and cuts power to the heating element. This is a safety feature designed to prevent fire or damage to internal components, and it means the unit needs to cool down and the root cause needs addressing before it will work again.
Est. repair cost
£60–£120 professional repair; £10–£25 DIY thermal fuse or sensor part (advanced users only)
🔍 Likely causes
🛠️ Step-by-step fix
Switch the air fryer off at the plug immediately and leave it to cool for at least 20–30 minutes — do not attempt to use it while hot
Check and clear all air vents: use a dry pastry brush or soft cloth to remove any grease or crumb build-up from the intake slots (usually on the back or sides) and the exhaust vent on top
Move the unit to a clear, open countertop surface with at least 15 cm of free space on all sides and above — never operate it under wall cabinets or in a tight corner
Remove the basket and drawer, wash them thoroughly, and check for any debris inside the cooking chamber that could be blocking airflow around the heating element
Reduce the basket load to no more than half-to-two-thirds full, lower the temperature by 10–20°C, and run a short test cycle to see if the E4 error returns
If the error persists after all the above steps on a clean, well-positioned unit, the thermal sensor or heating element is likely faulty — do not attempt to open the casing yourself; contact Tower support or a qualified appliance repair technician
📞 When to call a professional
If the E4 error reappears consistently on a clean, unobstructed air fryer — especially at lower temperatures or right at start-up — the thermal sensor or heating element needs professional diagnosis. Call an appliance repair technician and tell them: ‘My Tower air fryer is showing an E4 overheating error persistently, even after cleaning and cooling.’ Do not open the casing yourself, as the capacitors inside can retain charge even when unplugged.
⚖️ Repair or replace?
A professional repair for a faulty thermal sensor or heating element typically costs £60–£120 in the UK including labour. Tower air fryers retail between £40–£130 depending on the model, so on units under two years old or higher-end models, repair can be worthwhile — especially if it’s still within Tower’s 2-year warranty, in which case contact Tower directly before paying for any repair. For budget models over three years old, replacement is usually the more economical choice.