Upon arrival found that both systems Tstats would go from the time out screen to rebooting thermostat. Checked wiring and safety float switches, checked wiring at outside units all was good. Reset system and thermostats booted back up. Thermostat began to work properly, went back and forth between screens and checked alert history, found no recent alerts or current ones. System is now working properly.
Performed a two system maintenance checking cooling. Set thermostats to run at 100% and checked Indoor units, checked amp draws, electrical and mechanical components, drain lines and changed out customer supplied filter. Checked outdoor units pressures and amp draws all looked good. Found that the outdoor coils were dirty homeowner approved repairs.
Completed 4 system fall matience. All equipment was also entered. All units are operating properly at this time. I changed the upstairs April air filter 410. Also unit #4 Heat pump was washed. Other then the new unit the other 3 were signed up for chrome club annual.
Completed 2 system fall matience, signing up one unit for chrome club membership.
AC repair including maintenance and tune up. Replace air filters, iInspect evaporator coil, drain pan and condensate drain lines.