I have a Goodman gms9 furnace, my exhaust and intake pipes outside were covered by a snow bank. I cleaned them off and now I have exhaust air coming out and the intake pipe is sucking fine, however, the induced draft blower comes on, but, the electronic igniter does not get hot and the gas does not start, so, the burners never light, I get a flashing led code of six, what else could be wrong?