Oven does not power on at all (no display, no lights) on Hitachi built-in oven

Safety first: Always turn off power at the distribution board before opening any covers.

• Check household supply: Verify that the kitchen circuit breaker or fuse for the oven has not tripped. Reset if necessary.
• Test outlet or junction box: Use a voltage tester to confirm that mains voltage is present at the oven connection point.
• Inspect terminal block: Remove the rear cover and check the mains terminal block for loose screws or burnt connections. Tighten and replace damaged parts.
• Check internal fuse: Locate any internal fuses on the control PCB or wiring harness. Test for continuity and replace only with the same rating.
• Control board diagnosis: If power is present and fuses are good but the display remains off, the main control PCB is likely faulty and should be replaced.