When Zone 1 (ground floor) temperature is satisfied AC unit stops

[rdmitchell97006]

Recently purchased home with an EWC zoning systems (BMPlus3000 ?). The home has three floors and 5 zones. Initially I found that all of the upstairs thermostats were NOT set to "Cool" and one thermostat was dead. All of the zones are now working (cool air coming out of the vents). However, the AC unit stops running when the cooling temperature on the first floor (Zone1) has been met even though the upstairs thermostats are set to "Cool". Suggestions?

Ron Mitchell
Beaverton, OR

[Steven W.]

Are you using the "ONE ZONE" terminal on the Zone 1 T-Stat lower left hand side of the board?