Furnace quit again

It's a Suburban Dynatrail NT-30SP.

At the thermostat there is only one blue wire. AT the right side of the furnace are two blue wires coming out, connected to a red and white that go off to the left.

Wa8yxm, exactly what do you mean by this:
"Check Thermocouple to control board wire, DISCONNECT (Both ends one at a time) and re-connect a few times to clean the contacts." Would that be the two blue wires coming out of the side of the furnace?

And, where is that control board?

Old-Biscuit, at the thermostat there one each green, brown, red, blue, yellow and white wires. And, I can't see where to disconnect unless I need to pull that board out of the switch.

BTW all of you, thanks for taking the time to help me with this. It's warmed up a little here but it's fixing to get a lot colder.

Remove thermostat....connect the two blue wires together. If furnace fan comes on and fires up......replace thermostat
If fan does not come on..then the timed delay relay (can be stand alone type OR can be part of control board) is bad
If fan comes on but no spark.....then sail switch is not making up OR high limit switch is open

What furnace Brand & Model???

He said he heard the click.

IF the blower does not come on.. Thermostat

If the blower comes on but no attempt to ignite. Batteries are low

IF it tries to ignite, Succedes, but shuts down a few seconds alter

Trouoble shoot as follows

Check Thermocouple to control board wire, DISCONNECT (Both ends one at a time) and re-connect a few times to clean the contacts.

Check and clean the thermocouple itself

Sadly, I had to replace the control board

OEM (Attwood or Suburban) Roughly 250 Plus S&H
Dinosaur board 108 in my hand.

Observations by a trained electronics tech.. That Dino board is very very well built, I'd give it a 10 quality wise.. From the design phase up it's better than the OEM.. and less than half the price as well.

Turn everything off. Then as you turn everything back on, be prepared to listen by your ceiling AC unit. Did you hear a clicking sound? Some trailers have the heat and AC controls together in that location, at least mine does. There might be a loose wire in that junction, or a stuck switch, mine did. Knock on wood, but after my unit was fixed in 2010, it has worked every time. If you know what you are doing it takes less than 5 minutes to fix. Worth a try.

Does the fan start running?

Have you checked voltage at the furnace itself?