I have a carrier ics 96 down flow furnace that was installed 2 months prior with a 2 zone honeywellcom system. It was working fine but now I hear a slight rattle and I have been getting error code 33 for about a week now. It sounds like a fluttering, think of the sound a train makes.
The error code remains 33 and does not go to error code 13. I believe this means it's a limit switch fault. I have tried resetting it to no avail. Also all the registers are open. I have searched through the forums and have not found the answer I'm looking for.
I do get heat throughout the house and the flame burns bright blue.
Can anyone share some light on my issue?