I have an update, I found the info about adjusting the contacts in the thermostat switches. Did that and no change.
Next went to control boarod on front unit, checked fuse, not blown, unplugged power to board and reconnected. Could not see anything wrong.
went over to thermostat and tried to change modes, now I can change to mode 1, 2 or 3. Now my a/c units run in all three modes. I can control the furnaces in any mode now.
I have heatpump in mode 1 and mode 2. When I set thermostat to mode 3 and heatpump I never get any heat.
Is it possible rear unit (mode 3) is just a/c or do I have bad unit?
I have never owned a unit with 3 roof a/c's and 2 furnaces.
Anyone know how all this is supposed to work?