Problem: York Control board problem-Blinking 9 blinks after installation and not working- Reverse Polarity Problem
Solution: Just wanted to follow-up…figured out the problem described in my 14 December email…the following may help with future customers who buy this board. As you know, I bought the S1-33102956000 control board for my York P2MP furnace. I installed it and the furnace would not work. Upon installation, I got the recurring nine blinking lights error code which means reverse polarity problem or control board not grounded
Here’s what I found out. Apparently, the polarity of the new, upgraded control board is reverse (in polarity) in design from the OEM control board. To get the furnace to work with the new control board simply reverse two wires when connecting them to the new control board. There are two 24V wires that come from the transformer to the control board. A light brown wire connects to the lead labeled “XFMR” (near the black, blue and red wires and leads)… the other white wire coming from the transformer connects to a neutral lead.
Reverse these two wires…put the white on the XFMR lead and the light brown wire on the neutral lead….and then the furnace will work.
Hope this helps….I like your web site – it has a lot of useful, helpful information; and I plan to order some more parts from you in the future…I think I am going to replace parts before they break…novel idea!
*Below we have a real good YouTube Video made by GrayFurnaceMan that discusses problems with reverse polarity in furnaces. Thanks so very much GrayFurnaceMan for making this informative video! I hope this video will help you understand about reversed polarity problems.