Thank you for your post, friend!
I understand that your Electrolux cooktop is flashing an "E21" error code. Based off the information I was able to look up it sounds like a possible issue within the left board. I would suggest seeking assistance from a technician for proper repair because some of these intricate parts do require precision and patience. Therefore when replacing the exchange of electrical components or removing them from your appliance, I always suggest seeking professional assistance. -Matt
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