I have a CR-240 that is having an air intake issue when I put on the cover. Without the cover, the unit works fine, but once the cover goes on, I get the error that means the system is not betting enough combustion air. There are only 2 45's and a 90 in the 30' run, so we do not have too many turns or too much length.
Has this happened to anyone else?
Has this happened to anyone else?