Status
This is a critical alarm, the unit will not operate in any mode.
Description
Universal Outdoor Control (UODC) is not communicating with the Inverter Drive Board
Expected Operation
No operation.
Cause
May be loose or damaged modbus cable between UODC and Inverter Drive. A secondary cause might be that one of the two controllers has failed.
Solution
1. Make sure modbus cable between UODC and Inverter Drive board are connected and have no visible missing insulation and that the connectors are fully seated to plug housing and plug housing is fully seated to control. If necessary, replace modbus cable.