i bought a new circuit board (s1-33102956000) for my york furnace (031-1234-000). i installed the circuit board my self and got the 9 red blinking error (reverse polarity). Based on other posts on this site i reversed the polarity and am now receiving the slow green flash, which according to my manual indicates normal operation.
However, when i run the heater, the hot surface ignitor will not heat up. The gas turns on for about 7 seconds and then seems to just blow out air. Weird thing is, this was not an issue when i had the "old" circuit board installed, the ignitor would always heated up. Could i have wired something incorrectly even though im getting the slow green flash?
p.s. the heat sensor rod has been cleaned so i dont believe this is the issue.