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The only F04 error on a Bosch oven is with the Bosch 5000 Series wall oven. On this model, the problem is with the door latch. Unplug (or turn off at the circuit breaker) the oven. Turn it back on after a few seconds. When the power comes on, the oven should do a self-test of the lock mechanism. If the error persists, you'll need to do some diagnostics to determine if the lock is faulty. The problem could also be with the wiring or the control board didn't register the correct signal from the lock sensor.
Please add a comment with the model number of the wall oven for more assistance and any possible parts lists. You may want to call for service if you aren't comfortable doing this work. You probably need to get the oven out of the wall cavity for some of the diagnostics.
the key sign shows that the child lock is engaged. to unlock, usually you push and hold the lock button for a few seconds. the correct button is usually a dual function and so marked. if you need more help, go to manualsonline.com and look up your model number for your manual. good luck
There is a small white plastic triangular switch that needs to be in the out position for the oven to recognize that the racks have been taken out. Look at the back left side WITHIN the upper rack support channel. (This is not the small U-shaped piece that can be seen slightly lower on the wall oven.) If the switch is still depressed, with power turned off at the breaker, depress the switch using a small screwdriver. It should pop outwards to the proper "racks out" position. When we had this problem and recycled the power, we again got the signal. Husband switched to a nonconductive tool and repeated the depressing/releasing of the switch while the oven was giving the "remove racks" command. It sensed that all was well and now operates properly. If this does not fix the problem, you may have to replace a board $$$.
Check the lineator actuator motor. If you remove the top cover there should be a strip of metal stuck on the cover to put pressure on the gear to keep it from free wheeling down. These is a tiny button/nipple that sits in the hole in the top of the gear shaft. Lose it and you're sunk. Work with good light and watch the grease. Good luck
1. The screws seem to need a small hex screwdriver, but I managed to get my normal electrical screwdriver to fit - they are not too tight.
2. The wiring is straightforward - there is an earth position with no wire from the oven attached, marked with the standard earth sign, that should connect to your yellow/green wire. The other two connectors have either a blue (neutral) or a brown (live) wire attached to them - they should connect to your black (neutral in old money) or red (live) wires
After the oven is switched off, the after-run of the cooling fan is controlled by an electromechanical thermostat switch. The fan can switch back on, due to residual oven heat that accumulates within the oven's outer case and reactivates the cooling fan temperature switch.
Considering yours is making buzzing sounds and activates on and off, the fan's thermal switch may have dirty contacts or just be defective and require replacement.