Display shows E4 and the air fryer does not heat; fan may still operate.

Safety first: Unplug the appliance and ensure it is completely cool before opening the housing.

Troubleshooting steps:

• Visual inspection: Access the top section to view the heating element. Look for breaks in the coil, burn marks, or loose terminals.
• Check wiring: Inspect the heater wires from the element to the main board. Tighten any loose spade connectors and replace any charred or brittle wiring.
• Continuity test: Disconnect the heater leads and measure resistance across the heating element. A typical Philips air fryer heater is in the 10–40Ω range. An open circuit indicates a failed element that must be replaced.
• Relay check: If the heater tests good, inspect the main control board for a burned heater relay or darkened PCB around the relay. If the relay is visibly damaged or does not click when heating should start, the board or relay must be replaced.
• Reassembly: After replacing the heater or board, reassemble carefully, ensuring all earth/ground connections are secure.

Warning: Incorrect wiring of the heater can cause electric shock or fire. If unsure, have a qualified technician perform the repair.