Suburban furnace troubleshooting help
I recently bought a used trailer and it has a suburban sf-25 furnace in it. It sat unused for a long time so I brought it home, cleaned it out, powered it up, connected propane and it worked as it was...
Forum Discussion
Yes sail switch MUST CLOSE in order for DC Voltage to go to circuit board
No DC thru sail switch then no DC Voltage to gas valve/spark electrode
Sail switch makes up when fan motor reaches 75% RPM.....dirty switch, dirty 'paddle' etc ----sail switch doesn't make up
Check for 12V DC at sail switch....both sides
Black wire to ground (DC to sail switch)
Red wire to Ground (DC from sail switch going to circuit board WHEN switch is closed)
YELLOW wire is ground source
No DC thru sail switch then no DC Voltage to gas valve/spark electrode
Sail switch makes up when fan motor reaches 75% RPM.....dirty switch, dirty 'paddle' etc ----sail switch doesn't make up
Check for 12V DC at sail switch....both sides
Black wire to ground (DC to sail switch)
Red wire to Ground (DC from sail switch going to circuit board WHEN switch is closed)
YELLOW wire is ground source
