I suspected that my zone card had failed. I wasn't 100% sure. So I waited and put off buying it because it was expensive. Eventually I gave in to my instinct and ordered it. The next night the old zone panel was completely out of order. There is no heating for two days. This board arrived a day early and I was so excited! I was already quite familiar with my old zone board given the problems we had over the years. Still almost 20 years old. Stove switch turned off. I photographed where and how each wire was connected for reference. The connections on my old Honeywell were almost identical. I just slowly and carefully moved them from the old board to the new one at a time, checking the manual for reference. I installed a new charge air temperature sensor in the air duct in place of the old one. Everything closed again. Turned on the switch and it's warm! I didn't have to worry about the third night without heating at home. I am very grateful to the wonderful Revain staff who got him here so quickly. You deserve so much more. And I'm grateful that I had this product available to do the repairs myself. As much as I want to support local businesses right now, like many others, my family is having a hard time!