american standard freedom 80
 

Hi, I have a american standard freedom 80 single stage furnance and the diag. led does not flash. The door interlock switch is closed and I am getting 120 at the line h and line n. The voltage at the transformer is 120 and on the backside i get 24. Is there more voltage checks I can make.

Check the plug in fuse on the board.

american standard freedom 80
 

Hey thanks for the reply, I did check the fuse and it ohm out good. The voltage on either side of it is at 24 volts. Are there other fusings.

Thanks Keith112

That's the only fuse on the board, if everything else checks out good power wise. Sounds like it's time for a new board..

thanks for the help. I found three bad solder connections on the circuitboard. I repair them and the system is up and running. The diag. LED is flashing normally, the led flashing a fault code for the pressure sensor is gone (three flashes). So far so good. I repaired the connection that has 12 connections (one big connection) the connection solder were 3,6,7 and 10.

Thanks for your help, Keith