My furnace (RUUD) Starts up properly sequentially. The power vent lights, the forced air begins, the glow plug lights , then the gas is delivered. The flames ignite. Perfect! Then the glow plug shuts down and the flame goes out. The timing of these evens seems to be incorrect. The glow plug is on long before the gas galve opens. There is little time for the thermo coupler to get hot. IF I HEAT THE THERMO COUPLER WITH A TORCH THE FURNACE STARTS UP PROPERLY.
Is there a timer ajustment for all these funtions?
Periodically the second burner will not ignite, Why?