To quote from another board (*.*/forum/gas-oil-home-heating-furnaces/373358-bdp-carrier-furnace-20-yr-old-faulty.html)
Quote Originally Posted by mbk3 View Post
There a four things that make the blower go into operation and no heat with this -
1. bad transformer (loss of 24 volts)
2. open limit
3. open fuse link
4. bad board
Good list. And of course a transformer failure would prevent the relay from closing when the power is turned on, too.
So maybe it can't be true, but somehow it is.