ok everyone. i'm a dumbass. I checked the propane tank that was on and it was completely empty. apparentliy this furnace ran all night and sucked all the propane out of that tank. my bad. I turned my other propane tank on and the thermostat still would not control the furnace. there is a telephone wire connected to the back of the digital dometic thermostat. I disconnected that wire and put the fuse back in and the blower came on and then the gas kicked on then the unit started putting out heat like normal. I turned the gas off and let the blower stop by itself. then I pulled the furnace unit out of the camper. (suburban model SF-35Q). I checked the sails switch and it worked. I checked the high limit switch and it worked. I cleaned the terminals on the control board. I checked both the solenoids on the gas valve and they were fine. I could not find the relay delay switch. my guess is that its built into the control board. so I put everything back together. re-connected all the wires. thermostat is still completely disconnected. I turned the service switch (next to the blower) back on and then put the fuse back in and the blower fan kicked back on. After a minute I pulled the fuse to stop the blower and shut it down for the day. I'm assuming its not the thermostat since the blower would come on with it being connected. So that leaves the control board. any help is appreciated. thanks in advanced.
