Display shows E4 and the air fryer will not heat or shuts off quickly.

Safety first: Unplug the air fryer before inspection. Do not operate the unit on an unstable or incorrect voltage supply.

Steps to address E4:

• Check power source: Verify that the Kalorik air fryer is connected to the correct mains voltage (typically 120V in North America, 220–240V in many other regions). Do not use step-up/step-down transformers unless properly rated.
• Try a different outlet: Plug the air fryer directly into a known-good wall outlet (no extension cords or power strips). Avoid outlets shared with high-load appliances.
• Inspect power cord and plug: Look for damage, burns, or loose blades on the plug. If the cord is damaged, it must be replaced by a qualified technician; do not attempt to tape or splice it.
• Internal inspection: Remove the bottom cover to access the power supply / control board. Look for burnt components, bulging capacitors, or darkened areas near the input section.
• Replace power/control board: If there is visible damage or if E4 persists on a known-good outlet, replace the Kalorik power/control PCB assembly with the correct part for your model. Transfer all connectors one by one to avoid miswiring.
• Use surge protection: After repair, consider using a quality surge protector to reduce the risk of future overvoltage damage.

If you suspect your household voltage is unstable, contact an electrician before continuing to use the air fryer.