nealtw
Contractor retired
With no other place to go I found a few pretty cool tools for the control board:
1. troubleshooting manual: https://www.manualslib.com/manual/556709/White-Rodgers-50a55.html?page=3#manual
2. Schematic for control board: https://arnoldservice.com/wp-content/uploads/2012/09/PCBBF112S-50A55-289-instructions.pdf
Using the troubleshooting flow chart, it has guided me back to the 120v/24v transformer. Got voltage going in, nothing coming out.
That could be a problem.