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Suburban furnace.. I assume..
After three attempts it will go into lockout mode. To clear the lockout turn the thermostat completely OFF and wait a minute.
Now try the furnace again.. blower should come on, listen outside and see if you hear the electronic spark firing..
If you do then this tells you the Sail switch is functioning correctly but the gas valve is not opening..
In this case then you either have a propane supply issue, defective propane control valve on the furnace, or defective module board.
Unfortunately Suburban modules don’t have the diagnostic LEDs to aid in your troubleshooting.
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