Air fryer does not power on at all; no lights or display when plugged in.

Safety first: Verify the outlet with another appliance. Then unplug the air fryer before opening it.

Basic checks:

• 1. Outlet and breaker: Confirm the wall socket has power and that no circuit breaker has tripped.
• 2. Power cord: Inspect the Bosch power cord for cuts, burns, or loose plug blades. Gently wiggle the cord at the entry point while plugged in (unit off) to see if power flickers; if so, the cord or strain relief is faulty and should be replaced.

Internal checks (advanced):

• 3. Access fuse: Remove the bottom or rear cover to locate the main fuse on the control/power board. Test with a multimeter. Replace only with the same type and rating if blown.
• 4. Thermal fuse: Some Bosch air fryers route mains through a thermal fuse near the heater. Test for continuity; replace if open.
• 5. Power switch / touch circuit: If equipped with a mechanical power switch, test it for continuity. For touch models, check the low‑voltage supply on the control board (requires expertise).

Note: If the new fuse blows immediately, there is likely a shorted component (heater, motor, or power supply). Do not continue replacing fuses; seek professional repair.