I have an older (80s) Sears furnace. I came back home after a few days away to find some water in my basement (burst pipe above). It was less than 1/2 inch and only in one area--near the furnace and water heater. When I turned the thermostat up, the furnace went on briefly and then went off. I took the cover off the furnace to see if the pilot light was on (it's a gas furnace). It isn't but I can't figure out where to light the pilot. Please help.