I have a 1999 U320 and Zone 1 furnace stopped working. I would like to upgrade the 4 button thermostat. Anyone know what I have to do and what would be a good replacement.
Look in the commercial vendor here. Jim Frerichs repairs them.
This is the one I have works great even has time start and stop ability.
Dometic thermostat (https://www.foreforums.com/index.php?topic=27092.msg220860#msg220860)