Hi ronfaiplays,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
Don't know of a reset switch on the furnace. Turn it off and on, but it may take several attempts to light the furnace due to air in the system. Also when you open the valve on the propane tank you must open very slowly at first to pressurize the regulator and lines because all the tanks have a safety valve built in to stop flow of propane in case of broken hose or accident.
Let us know what happens.
Enjoy the forum.
Jim M