Need help with a SF 30 Suburban Furnace
My original problem was the usual story. The fan would come on and the furnace would fail to light and the fan would then shut down. I, standing outside could hear the switch and smell gas but the spa...
Forum Discussion
enblethen wrote:
Locate the two wires feeding the furnace either at the thermostat or in the furnace. Connect them together. The furnace should start and then produce heat. If this happens, separate the two wires. The furnace should go into shut down mode and turn off.
If this happens, the problem is in the thermostat.
Make and model of thermostat? Number of wires in thermostat? Does it control the A/C?
Here on p.35 is the schematic of my unit. The wires coming down from the thermostat are bk, gn, y, wh and they connect to r, bl, bl, and y, in order, on the furnace.
I have no idea which pair of the bk, gn, y, wh to tie together. I see 6 possible pairs and don't know what further damage could be done by picking the wrong pair.
I do know that when powering the furnace with an external battery that the red and yellow wires power it up with the two blues tied together. Gas connected and the furnace lights and runs.
