We have a new home in Flagstaff, AZ so it's a fairly new furnace unit with typical modern bells and whistles. That said, my situation is after yesterday's heavy snowfall, our furnace, and those of numerous neighbors, went off when the snow got to the level of the air intake and plugged off the air supply. A number of them have said that during the day, snow melted and their heaters are back working,. My question: Do these heaters come back on automatically? Or do I have to hit a reset button somewhere? I left the house with the heater set at 50* to keep the water from freezing and it has apparently gone off because my neighbor came in and said no water comes out of the tap or toilet. Thanks very much!

[color=#222222]1. In which area you live and ambient temperatures you usually experience. - Pacific Northwest United States. Temperatures are just above freezing overnight, mid 40s during the day currently.[/color] [color=#222222]2. House style and construction details. - Rambler ~2400 sqft[/color] [color=#222222]3. Make, model and age of equipment related to the problem.[/color] - Thermopride OC5 furnace with a Thermopride A,AF burner [color=#222222]4. Fuel type. - #2 diesel oil[/color] [color=#222222]5. Water temperature and pressures of boiler systems. -N/A[/color] [color=#222222]6. What type of zoning do you have with your boiler system. -N/A[/color] [color=#222222]7. Thermostat type. - Honeywell RTH8500[/color] [color=#222222]8. Anything else that would be useful. No detail is to small. The more information you provide the easier it becomes for the professionals in this forum to determined the cause and correction to the problem.[/color] I'm experiencing quite a lot of air in the supply line between heating cycles, so much so that the pump expels nothing but air or sputters out of the nozzle for the duration of the Protectorelay 45 second inspection period. During this time I audibly hear the lack of ignition. After the lockout period and resetting the furnace will fire and run without issue. During the run I can hear the audible ignition occuring. I have verified the air expulsion from the nozzle by inserting the gun assembly into a bucket during the initial ignition cycle. I've replaced the pump with a new A2VA-7116 Suntec pump, changed oil filter, checked all fittings for snug, verified transformer function with the screwdriver test, replaced the nozzle with a 0.75-80A. The tank is buried outside in front of the house, the line runs are approximately 30 feet long or so, mostly underground. The house was built in the early 70s and I might only speculate that the tank is that old as well. I have between 18-20 inches of oil in the tank currently. I've used compressed air to attempt to back-pressurize the line into the tank to clear any debris. At this point I don't think the issue is cold oil or ambient air and I suspect I have a leak somewhere in the intake line that is allow the oil to leak out and air to enter the intake line. Is there anything else that I might be missing?