F05 error for Whirlpool GHW9100L Front Load Washer

That means the temperature sensor is out of range in most cases it will have to be replaced. Visit the link below for troubleshooting the error.
Whirlpool Duet Washer F05 Error Code

The following link explains the "F05" error code:

http://www.fixya.com/support/r629462-f05_error_code_whirlpool_duet_kenmore

I hope you find this information helpful. I have seen this error code generated by something as simple as a loose connector on the NTC sensor. Hopefully, you can resolve this with no expense. If you do require any parts, however, you can locate parts with illustrations at searspartsdirect.com or repairclinic.com. If you require further assistance, please let me know.