My 8 year old Trane Model tuh2d120a9v5va furnace is not giving out heat, but the blower is on. The service people are all busy due to the recent storms. I imagine the ignition is not working.
There is a little glass viewing window. I see red and green flashing lights. The red flashes 4 times, the green 3 times, and these overlap. What do these lights mean?