I have an Empire DV 215 propane furnace. Last January I turned it off after successfully using for the month of December. Still have 25 gal of propane and wanted to heat area to keep plants warm. Can get pilot light lit but burner won't ignite. Totally cleaned all parts and replaced thermopile and thermostat... still no luck. Since this is a fairly simple system, am not sure what I could be missing. Please help.

Are you sure there is power to the furnace? Is the pilot a standing pilot? (that you light yourself) Do you hear the gas valve clicking or making any sound when the tstat is calling for heat? Takes 2 ,one to be at the furnace with ears listening whie another raises the tstat to call for heat,, let us know what you`ve found

It's a standing pilot. In the past when the thermostat was turned up you could hear it. Now there is nothing.