A door closer diagnostics system including a door closer, a server, and a mobile device having a display and at least one sensor. The mobile device is configured to (i) generate, by the at least one sensor, motion data indicative of motion of the door as the door is moved from an open position to a closed position, and (ii) transmit the motion data to the server. The server is configured to analyze the motion data to (i) determine a duration the door was in each of a plurality of door movement zones between the open and closed positions, (ii) determine at least one adjustment to the door closer for a successful installation of the door closer based on the duration the door was in each of the door movement zones, and (iii) transmit at least one installation instruction corresponding with the at least one adjustment to the mobile device.