E00 usually requires a technician to reset, although you may manually do it by pressing and hold the start button for five seconds the "feature" should disable. E21 is blocked filter or excess of fabric in the filter over time. Turn the appliance off by the main supply, access the filter located on the bottom kick plate. Remove the filter and clean in hot soapy water, check the propeller for fabric debris. Run a hot wash without any clothing 70C or above with 1/4 cup white vinegar, you should do a maintenance wash at least every month and clean and remove the powder draw or detergent draw and inside every 2 weeks, clean the rubber door seal remove coins which are common and build up of debris 
SOURCE: bosch washing machine error code
I've had the same problem, when we had a power cut I opened the door and after that I could only got F21 flashing! ,I googled for the answer and this WORKED:
Turn programme switch to 6 o clock,hold RPM button turn switch to spin, release RPM button
SOURCE: Washing machine heater not working
Only way to be sure if it is the heater, is to test it with a meter.
They are a fairly straightforward job to replace
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Thanks..
SOURCE: Got the Bosch Classixx 6 Express 1400 washing machine cant
Power on, press the start button for 5 or 6 seconds, the sign will go
off. Try the door gently. Means the machine is locked, for children. I think if you do
it again it locks.
Pl rate me 'very helpful' for the free help, thanks
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