No Comm From Micro To Inpbd1

The main microprocessor cannot communicate internally; the unit shuts all modules except the display and alarm, and the main microprocessor status LED stays steady green.

Alarm 21100 NO COMM FROM ANY BOARD TO MAIN MICRO is not active and the main microprocessor cannot communicate internally.

Engine and Electric Operation: Shutdown all modules except the display and alarm. (The alarm will only display if the display module is communicating.) Main microprocessor status LED will illuminate steady green (not pulsing).

Auto reset when internal communication is restored, alarm reset, or alarm may be manually reset by turning the unit off, then back on again.