We just went thru the furnace problem this weekend on our maiden voyage in our new BH. The furnace worked fine all evening and then we woke up at 4 am with the inside being 50 degrees.The furnace would not ignite at all with 10-15 attempts. Gas tanks were full.Lit the stove,still no luck. I switched water heater to gas and after it lit the furnace lit also.It has worked fine since. Called the dealer and he suggested to replace the regulator, which I did today but now it is 70 degrees instead of 30 so I haven't tried it yet.Another possible fix is to turn both LP tanks off and then turn back on slowly. With the new OPD valves, if you tun them on too quickly the OPD will partially shut down the gas flow, thus not enough pressure to ignite furnace.Let us know what you find.