I tried that a number of times before I wrote that post. I just tried it again and wouldn't ya know it worked! I'm glad you took the time to say it does work 'cuz I wouldn't have tried it again.My owners manual states you can extend the run time 10 min more for a total of 20 min run time. It states during first 10 min run press lock/start and it will extend run time.
Started at 3:05 (Eastern time), then re-sent lock/start at 3:10, ran until 3:25 and shut off.
I stand corrected, and quite happy, too! Thanks!