emm... not heat

j-d wrote:
As we ponder this, and I hate intermittents too, it isn't clear to me if the fan was starting or not. OP indicated that the fan WAS starting, but most of the responses were worded as if it had NOT started. Being sure which is which will help with troubleshooting.

OP stated:
"So I waited until we got home. When I switch the thermostat to "heat" I can hear a relay fire in the thermostat, followed by the click of a relay/solenoid in the furnace. But the fan does not come on.

Check the connector on board...loose/dirty/not making good contact.
Doesn't take much to stop 12V DC

As we ponder this, and I hate intermittents too, it isn't clear to me if the fan was starting or not. OP indicated that the fan WAS starting, but most of the responses were worded as if it had NOT started. Being sure which is which will help with troubleshooting.

well, crap, this is not going to be fun.
Went out to the rig today and it works

I hate intermittents

Suspect list (And by the way I do not have a Surburan, I have an Atwood, no difference really save for the name plate).

Fuse
Bad connection
Fuse
Circuit breaker (more on this in a sec)
Control board
Blower motor

IF it is the control board,,, May I recommend a DINOSAUR board.. Their most expensive furnace board (Guess which one my Atwood takes, by the way it fits Surburan as well, same board) cost me 108, IN MY HAND. The OEM 250 plus S&H.

Plus it is way way better made from the drawing board to the final assembly it is better made with quality parts here in the USA.

The circuit breaker: On my Atwood, if you remove the cover outside, there is a switch.. same is also a circuit breaker.. HOWEVER if it is off or tripped you will not hear anything from the furnace area when the T-Stat calls for heat, Since it shuts it all down (power---Breaker--Everything else on furnace including T-Stat).

I would start by checking for 12vdc at the power terminals on the control board. Then wiggle the heavy wires in the area to see if it kicks in.. I know I can kill mine by pulling just so on a wire but it re-starts when I let go.

If furnace fan is not coming on.........all the propane in the world won't help.

The fan gets power from DC Dist panel (fuse).
DC power is on control board blower circuit (use to be on a timed delay relay).
When the t-stat clicks it sends DC power to the control board which allows DC power to go to motor. Fan runs purging combustion chamber, makes up sail switch/limit switch which allows DC power back to board. Board then sends DC power to gas valve and spark electrode for ignition. Main flame light off, flame is proved......heat. Temp set point of t-stat is reached....t-stat opens and drops power off timer circuit on board......which then allows fan to run for cool down cycle until timed out.

You hear click at t-stat.
You hear click at furnace (timer on control board)
But no fan (motor doesn't start).

Bad blower circuit on control board (unless you have a separate timed delay relay....but it being a 2012 model probably on the control board) OR bad motor

Do you have a furnace with outside access cover or only from inside?
You can check for DC power at power terminal on board and then to motor (red wire).
Power to board and not to motor.....bad board
Power to board and to motor......bad motor
Provided you have good ground circuit.

If bad board..replace with one from Dinosaur Boards...Fan 50 Plus style

And provided you have good DC voltage.

I think at the end you are saying the fan runs but no heat. That sounds like the sail switch keeping the propane off. Either the fan is not spinning fast enough to open the sail switch, or the switch is somehow not able to travel freely.

Do you have good gas flow to the stove? Turn on all the burners and check. It could be caused by a defective gas regulator. But the fan not coming on is making me rethink it.