suburban furnace won't start

Old-Biscuit wrote:

If it has a bad stand alone timed delay relay it can 'click'
If bad relay is on circuit board it can 'click'
If sail switch is stuck closed...you can hear just a 'click' and nothing will run
If motor is bad you can hear a 'click'
Click could be just at t-stat when contacts close.

If you can hear a bi-metal relay click, a sail switch click when it is stuck in only one position, or a computer board which doesn't have any magnetic relays click (that I know of) then you got some super hearing ability. Me I can only hear the igniter clicking when the furnace is not on the bench.

To the OP take a look at the following Youtube.. You need two things to have ignition spark and gas. If you hear the sparker, then it leaves only gas. Now if you do have ignition and it goes out after a few seconds, then it will be your electric safeties coming into play. If you have no ignition but do have spark....

On Edit:

Bugs love the smell of propane and will do all sorts of damage to that area. You might pay to install some screens on the furnace if your area is prone for this happening.

Second Edit:

OP You may also have a slow leak in your propane line allowing air. Prior to running the furnace try to light the stove with a match. It should ignite right away, and not blow the match out. If air is in your line after sitting for awhile then your furnace need to cycle a few times before the line is purged of the air. If you want to get fancy you can build a manometer pretty cheaply.