I have a TRANE XL80 two stage upflow furnace that is eleven years old, with a programmable thermostat. The furnace quit working, I called a technician. He said the problem is the integrated two stage heating control board, He recommends that I replace the entire furnace, because "the board is so expensive, and the furnace is so old." I checked on myhvacparts.com, and the board is $162.95. Seems to me that a TRANE XL80, with a 20-year limited warranty on the heat exchanger, should last longer than 11 years. An entire new furnace, installed, is going to run me about $3000. Should I just replace the board, or would this be throwing my money away?
BTW, the furnace started working again, but the board appears not to be responding to the thermostat. It's either all on (until the house is about 80), or I manually turn it off.
Any advice?
Thanks