You may run into this furnace issue someday.
I recently took my propane tanks to a fill depot for refill. I hooked them back up and opened the valves as usual. Later that night the temps dropped and the furnace wouldn't come on. So I read the manual (of course first tried to impress the wife that I knew the proplem, I didn't). The problem was the pressure valves in the system. It's a simple fix.
1) Turn off the tank valves, wait 5 secs then turn them on.
2) Set thermostat to Furnace, Auto, manual raise the temperature to about 80 deg
3) Sit down on the 5er steps and put your hand at the heat output vent and feel the air as the furnace blower kicks on. Let it run a couple of minutes
4) Set thermostat to OFF and let it shut down.
5) Set thermostat to Furnace, Auto, manual raise to about 80
6) When you feel the heat coming out, go ahead and adjust down to normal temp
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