Ice Maker and Water Dispense Actuate Together

Hi, My through the door dispenser/ice maker is acting up. When either the water dispenser or icemaker calls for water both units activate. When I try to dispense water I get water but also water dispensed to the icemaker causing overflow. I have replaced the water valve and verified water pressure is okay. I suspect the control board but don’t know how to verify. It also seems there are 2 boards. Not sure to tell which one might be the problem. Any suggestions?