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I believe your RV has the Atwood furnace. If somlocate the control board module and there is an LED on it.. turn thermostat off, have someone turn thermostat to furnace while you observe the LED for number of flashes..
From the code it flashes you can narrow down your troubles a bit..
Since fan is spinning up you have 12 volts tomthe control module and fan.. it if either the sail switch doesn’t move over enough to complete the circuit OR the Hi Limit switch is open then you will not hear the DSI sparking...
It’s a guessing game until you further diagnose looking at LED..
It cud be an open sail switch, and open limit switch, or a bad control module. If you have the skill set and know how to use a simple multi meter you can verify both sail switch and hi limit switch in very short time...
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