My furnace (Quatro True Blue) has been diagnosed with a bad circuit board.
The manufacturer is out of business.
The furnace (propane) is in good shape except for the board.
Can another board be used in place of the bad one?
Or, since the furnace is a 1990's model, would I be better by installing a more efficient one?
Thanks.
Hunter Clarkson

There are universal circuit boards that can be adapted to a variety of applications, but this is not a job for a D.I.Y.'er. Seek professional help.