NAPCO Gemini GEM-X255 Operating Manual page 36

Trouble System Trouble
Indication Condition
E40-00 RF Self Test Failure
E41-NNN Fire Trouble
E51-00 Bell/Siren Trouble
Smoke Detector Dirty
E66-NNN
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S Y S T E M T R O U B L E E R R O R C O D E S
A wireless motion sensor on the zone indicated has failed its automatic self test routine.
Call installing company for service.
A problem has been detected on the Fire zone indicated. Call installing company for service.
There is a problem with the Bell or Siren. Call installing company for service.
The Smoke Detector on the Fire zone indicated is in need of service.
Action