Hello, I have a BLANCO BOSEP168 oven. I have used the pyrolsis function, and turned it back to '0' after the time had finished (150mins). However, now Er U and the lock symbol has appeared and I cannot find how to remedy this. The manual does not have an answer. Please advise what I am to do?? My Email is achahn56@yahoo.com.au Thank you, Anna Hahn