Suburban SF30 Furnace

Another option - mounted to the blower housing (on my unit) Was the delay relay, a black circular device with numerous wires affixed. The cap on my unit cane loose and intermittently would allow then refuse to allow ignition. It's worth taking a look at. I repaired mine by holding the relay cap in place & applying a teeny bit of superglue (aka.cyanoacrylate)to the area around the cap. This repair actually held for 2+ years. PS: the key word there is TEENY - too much adhesive and the whole thing becomes one huge bonded together mess.