Furnace

Since we are planning a trip next week boondocking, we decided to test our furnace last night at home.  Our 172 has the wall switch (temp control) you just put if on the temp desired.  the furnace fan came on right away and then you could hear it light.  It turned off and we waited for it to cycle back on, the furnace fan came on but it failed to light during the second cycle.  Getting a little concerned about the gas I turned the thermostat off.  Waited a few minutes then cut it back on,,, furnace ran through 3 cycles lighting each time now.  Has this happened to anyone else or is this something I should be concerned with??  What if during the night the furnace fails to light?  Is it supposed to light each cycle or shouldn't a pilot light just stay lit? 

It could be air/moisture in your propane lines, the furnace will sometimes not kick on and cycle correctly if you haven't purged air from your lines.   When I park to camp I usually turn on the propane, light a burner on the stove to make sure air has been mostly purged from the lines.   Then I turn on the water heater let it run for a bit then cycle the furnace to make sure its working. 

PodPatrol wrote: gmandual wrote:   These "no pilot"  furnaces don't open up gas full untill they get a light from the  electric lighter gizmo and that happens on each start.    did the g-man use "gizmo" ???   Thanks g-man !!   You have a way of explaining things that I can actually understand !!!

whatchamacallit