hI ckass
Leave the green wire there. The unit comes with a ground strap attached. It is located where your power cord is nutted on the the terminal block in the back of the range. It is attached to the middle (of the three) nuts and this strap is screwed directly to the chassis, should be right behind your white (neutral) wire below the terminal. If I remember, it's thin brass, less then 2 inches long. If you have three wires gong to the terminal post, and a forth wire going to the chassis, and you still have that strap, remove it (should of been removed during install). When I corrected this, and turned it on, the same error came back on, but resetting the circuit breaker (10 min off(maybe twice(I forget(it might store the code)):) corrected the error, and has has been good for over a month. Good thing to check this before swapping circuit boards. Of course turn off the circuit breaker before doing this. The strap stays for a 3 wire install, if local code permits. (no ground wire to chassis). The install instructions should be online if you don't have it (pg. 6) Good luck.
(I would guess changing from a 3 to 4 wire install might also correct this condition, to decrease electrical noise to the computerish electronics:)

Just wanted to let you know that I am having the exact thing happening to my stove. I think Electrolux should see that this is a common problem and find out how to fix it.

EUREKA ! I finally found the problem : interference with other electronics nearby the range !!! My Electrolux induction range cannot stand any iPhone, iPad or Fitbit watch nearby ....it reacts by the famous code E15. It took a years of research on the web for me to find that out ..... and yes, it was an intermittent problem so I never decided to change this famous board since many people did ...without success.