Steve,

I hope you had a merry Christmas, and I once again, want to thank you for your help!

You are absolutely correct in that I was not cognizant of the need for the default cycling provided by the controller to the frequency valve when there is no output from the O2 sensor. Learning, learning, learning…. I’ll be off to purchase some calibrated flasks this week.

A THOUSAND AND ONE THANK YOUs - Have a happy & healthy New Year!