MAINS FAIL TO CLOSE ALARM

UnclassifiedEmissions

What This Code Means

Generator turns off; Mains Fail to Close Alarm displayed; Alarm LED beside the screen turns on; Controller's buzzer starts beeping; Fault displays on the green LCD screen

Possible Causes

  • Red stop button is pushed to initiate a return to Utility request during on-load test, but Utility is not available
  • Fault occurs during ATS operation

Suggested Actions

  1. 1Push and hold the alarm button for 5 seconds to reset the alarm
  2. 2Push the alarm button to silence the beeping
  3. 3Push and hold the alarm button for 5 seconds to reset and clear all alarms

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for MAINS FAIL TO CLOSE ALARM on your specific Thomson Power Systems unit — cited to the OEM manual, not a forum guess.

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