Does anyone know what the Error Code F90 means? Can't seem to find it anywhere but the oven will not turn on and it keeps giving F90 code.

See if this helps: https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20and%20KitchenAid%20Failure%20Codes%20a nd%20Wiring%20diagrams.pdf
If not, then go here: Appliance Fault Codes - AppliancePartsPros.com (http://www.appliancepartspros.com/repair-help/appliance-fault-codes.html#Whirlpool%20Duet%20Front%20Loading%20Ga s%20and%20Electric%20Dryer%20Fault%20Codes)