Bosch 500 no display - Bosch WFVC5400UC Washer

Probably a thermal fuse or door switch.

The electrical connector to the display panel maybe loose.

call Bosch 1800 944 2904

Check this link for tips: Door lock

Suggestion: Try unplugging the washer for 30 minutes.

Click HERE to get the Users Manual for your machine, from what I can see, it's in the selection option of the machine.
From the manual:
Select the option to be changed with the "Menu" button. Press the button to move to the next option on the display. The active symbol starts flashing.
The current active option setting is displayed on the right. These settings can now be changed with the "Select" button. Press the button to jump to the next possible setting. Pressing the "Menu" button again saves the setting. If you don't press any buttons for 10 seconds the settings are saved automatically.
Hope this answers your question. Please rate and comment. Thank You
Joe

According to the service manual, you should clean water drainage pipe and/or drain hose. Turn selector to off and restart 'drain, program or, on 500 plus machines, the 'refresh' program. It also says this is caused by using too much detergent. Bosch recommends using half of what the manufacturer recommends when using HE detergents. They don't recommend regular detergents. I would run the short wash or refresh cycle without detergent and hopefully your lines will clear. I have also read that if this persists, powder HE detergent is better to use instead of the liquid because of certain chemicals contained in the liquids that cause it to congeal in some front loader drainage pipes. I hope this helps.

It means it is time to change the water filter. You can hold the button down for a while and it will reset whether you change the filter or not.

I did it! The trick was to push a small nail into the hole and push in on the filter door while rotating the door...all at the same time. The original problem was the water not draining and the washer displaying code E04. Just like a previous solution stated, there was one knee high sock in the drainage pipe.