What to check, in order
- Let it cool right down
Unplug it first.
- Clean out the grease
Built-up grease is one of the two usual causes.
- Give it space
Make sure nothing blocks the air vents, and leave clear space behind and above it on the worktop.
When to call an engineer
If it keeps cutting out after a thorough clean.
Good to know
- Air fryer makers use these codes less consistently than other appliances. If your manual says something different, the manual wins.
Quick answers
What does the E4 error code mean on an air fryer?
The over-temperature cut-out has tripped: the fryer got hotter than it's allowed to, and shut itself down to stay safe.
Can I fix E4 on an air fryer myself?
Very easy (about 30 minutes). Start with: let it cool right down; clean out the grease; give it space. If it keeps cutting out after a thorough clean.
Is E4 on an air fryer worth repairing?
Usually free. Clean it. This usually isn't a fault at all, just grease and too little space around the fryer.
About this code
Unbranded and less common appliances don't publish one shared code list, so this page gives the most common meaning across makers. Your manual is the final word, and the model number that finds it is on a label on the underside.
Last reviewed October 2026.