: Some versions of this board require "addressing" via dip switches or jumpers to communicate with the main system controller. Match these settings exactly to the board you are replacing. Troubleshooting
: Take high-resolution photos of all wiring connections before disconnecting the old board. Label individual wires if they are not already color-coded or tagged. 4828-0100594
: Disconnect all power sources to the HVAC unit. Large industrial systems may have multiple power feeds; verify with a voltmeter. : Some versions of this board require "addressing"