Suburban Furnacw won't start.

Eaglefirefighter wrote:
Full battery, full propane. Motor needs to start before burner will fire.

Correct .......model the fan must start first before anything else can occur.

Your year furnace probably has a stand alone 'timed delay relay' which has DC power to one side via Fuse in DC Dist. Panel

Then when t-stat calls for heat (click) DC power goes from t-stat to On/Off switch on furnace cabinet then to other side of 'timed delay relay' This allows the fused DC to flow to fan motor and start it.

So either fused DC power is NOT on TD Relay....blown fuse
OR DC power from t-stat is not getting to TD Relay....On/Off switch needs reset, shorted wire
OR TD Relay is bad.

Hopefully your furnace has an outside panel for access otherwise you have to pull furnace from inside to gain access

Full battery, full propane. Motor needs to start before burner will fire.

enblethen wrote:

The fan should come on as soon as the thermostat calls for heat.

Not necessarily. Many are equipped so that the fan only comes on when the heat exchanger gets HOT.

So, for the OP, leave it ON and turned up for a minute or two.

There could be a circuit breaker on the motor leads that is tripped.
No power to furnace
Thermostat on off switch in off position.
Maintenace switch in furnace turned off.
The fan should come on as soon as the thermostat calls for heat.
Is the thermostat just for the furnace or is all for the air conditioner?

do you have a 12v battery charged,

Make sure your propane is on/flowing without air in the line (does the stove work?).

Have you checked the igniter to make sure it's clean?

And have you tried to start it by bypassing the thermostat?

Here's your manual in case you don't have it.