Bryant Furnace. Thermostat needed batteries. New batteries inserted. Furnace running. Now condenser unit pan is overflowing at times with water. Red light stays on. Furnace is heating fine. Took off top door and put back on. Red light still on?? Lots of water for wintertime?

Is this a condensing furnace? AFUE if you know it. Metal vent pipe or 2 plastic pipes. You would get water if a condensing furnace. Drain may be plugged. Red light in my unit means everything OK.