What is the code for the failure your experiencing ? Look at the red
flashing indicator light on the Circuit Board in the blower compartment
.. count the number of flashes then refer to the sticker on/in the
furnace for the correct code and respective likely problem. On certain
model Carrier furnaces., there have been specific problems associated
with THAT model ; ie : Faulty circuit boards / faulty limit switches /
faulty pressure switches, etc...
GIve us the model number of the furnace and the code number that flashes