Depends on how old unit is...The E11 error code indicates a problem with the gas sensor
DE32-60013A and or the wire harness
DE39-40678D. Unfortunately the manufacturer has discontinued the sensor. You may want to try contacting local parts dealers, one of them might still have it in stock. Enter your part number in a search engine, a smaller company might have it or try eBay, Amazon or similar sites . Search by using the manufacturers part number. Try a used appliance store, sometimes they have the same model or a usable part for your machine.