I need help with Suburban NT-12SE Furnace!
I have a 1984 Toyota Sunrader. I've completely renovated my Sunrader. I'm approximately 98% done with renovations, but I'm having issues with my Suburban furnace. I have a Suburban NT-12SE furna...
Forum Discussion
Can't say about the limit switch without looking at a diagram. If you have a link you could post it.
However, the normal course of events is for the fan to come on for some time (usually about 30 seconds) to ventilate the furnace of any residual propane fumes. Normally the 30 second timer does not start until the "sail" switch tells the controller that the fan has started. After the 30 seconds, the solenoid gas valve opens and the igniter tries to light the burner (usually max of 3 tries). If burner lights it heats the thermocouple telling the controller that the flame is burning.
Based on that and the fact that you have changed the controller, I'd be suspect of your sail switch operation.
However, the normal course of events is for the fan to come on for some time (usually about 30 seconds) to ventilate the furnace of any residual propane fumes. Normally the 30 second timer does not start until the "sail" switch tells the controller that the fan has started. After the 30 seconds, the solenoid gas valve opens and the igniter tries to light the burner (usually max of 3 tries). If burner lights it heats the thermocouple telling the controller that the flame is burning.
Based on that and the fact that you have changed the controller, I'd be suspect of your sail switch operation.
