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...
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ALL the sail switch does is close to allow 12 volt positive thru it. You test the sail switch by just seeing if when running you have 12 volts on both wires at the sail switch. IF NOT, and you have 12 volts on one side and not the other the switch is bad. Doug
