E6 appears on the display; fan may run but there is no heat, or unit shuts down unexpectedly.

Safety first: Unplug the Klarstein air fryer and wait for internal components to discharge.

Steps:

• 1. Confirm heater integrity: Before suspecting the board, test the heating element and thermal fuse for continuity as described in other entries. If both are good, proceed to the control board.
• 2. Access control PCB: Remove the outer housing screws and carefully separate the shell to expose the front control panel and main PCB.
• 3. Visual inspection: Look for burned spots, cracked components, or bulging capacitors near the heater relay or power triac (often mounted with a heatsink). Check for darkened PCB around high-current traces.
• 4. Check relay operation (if equipped): With the unit unplugged, inspect the relay solder joints for cracks. Reflow solder if you are experienced. If the relay casing is melted or cracked, replace the relay or the entire board.
• 5. Replace control board: Klarstein air fryers typically use integrated control boards. If the heater drive components are damaged, the most reliable repair is to replace the complete control PCB with the correct part for your model.
• 6. Reassemble and test: Reconnect all harnesses firmly. Refit the housing and screws. Plug in and run a short test cycle to verify that heating resumes and E6 is cleared.

Warning: Board-level repairs involve mains voltage circuitry. If you are not trained in electronics repair, use a qualified technician.