E8 appears on the display; unit may power on but controls are unresponsive or shut down intermittently.

Safety first: Unplug the Klarstein air fryer. Internal power supply circuits are connected to mains voltage.

Steps:

• 1. External checks: Verify the wall outlet with another appliance. Inspect the power cord for cuts, kinks, or burn marks. Ensure the plug fits firmly in the outlet.
• 2. Access internal power section: Remove the housing to expose the main control PCB. Identify the area where the mains input enters and is stepped down to low voltage (transformer or capacitive dropper, rectifier, and regulator).
• 3. Visual inspection: Look for burned resistors, cracked capacitors, or darkened PCB around the power components. Check the mains connector on the board for loose solder joints.
• 4. Cord and connector test: With the unit unplugged, test continuity from the plug pins to the board input terminals. Replace the power cord or internal mains harness if open or intermittent.
• 5. Replace control board: If power supply components are visibly damaged or if the board does not provide stable low voltage to the logic circuits, replace the entire control PCB with the correct Klarstein part.
• 6. Reassemble and test: Refit all covers and screws. Plug in and verify that the display powers up normally and E8 is cleared.

Warning: Do not attempt live-voltage measurements inside the fryer unless you are trained and using proper insulated tools.