So I have a question for you all. I will try to explain this as best as possible in the short 2 days i've been in my attic trying to figure out the problem. I have a Carrier unit installed around 2004. I apologize I do not have the serial/model #. So this winter I noticed that my heat would randomly work. The thermostat works fine. I could hear the unit kicking on and attempting to turn on for about 1-2 min than it
would shut down. This cycle would have happen about 3-4 times and then nothing. So I went up into the attic and after being up there for about 40 min I noticed this. There are 5 burners, when the unit attempts to work, the 2 top burners come on. The other 3 burners wont light and then the unit shuts down and attempts the entire cycle again. The flame sensor is on the bottom burner. The amber light gives me error code 34. I've reset the power to unit and it tends to work for a little bit then the same thing happens. Thanks for any help. If there are any questions, i'll try to respond asap.