So it seems to work for a while and then stop, E2 code again. I did the best I could to check all the tubes and the switches nipples, could not see any blockages. I woke up at 2 AM and noticed it was not working even though the thermostat was calling for heat. Yesterday I talked to the tech and he said if he comes out he has to replace the switch and charge me $400. I found both low and high in a pair for 60 so I ordered them. Besides paying another company to come check the furnace I don't know what else to do. I am already minus $200 and still have a problem.