The E21 code will show when the machine thinks it has detected a blockage between the circulation pump and the water inlet. This could require pulling out the pump to clean or replace it, which will probably mean pulling the bottom cover off - which is a bit beyond the scope of this video. But before doing that you can also check out the E20 error code video for some other diagnosis options.
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0:00 Intro and explanation of the fault
0:41 Things to check
3:10 Disassembly
5:29 Checking the pump
6:13 Thanks for watching, buy me a coffee
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