Armstrong Ultra SX 80 gas furnace
I have a bad control board. I have gone through the trouble shooting guide and do not have 120 VAC across D1 and neutral (N) and the manual says that indicates "replace blower board". I can jumper 120 VAC to D1 and the combustion blower starts and she takes off and ignites, etc.
My question is where can I get that board? It is a Honeywell ST 9120A2004.
Thanks for any help you can provide.