What do F03 or F04 error codes mean on my Bosch oven?
An F03 or F04 error indicates a problem with the door lock mechanism. Turn the power off and back on after a few seconds — the oven should run a latch auto-test. If the condition persists, note the code number and call an authorized servicer. (Page 19)
From the official Bosch 5000 Series Wall Ovens manual, page 19
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