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SBUS Class A supervision lost
trouble

Silent Knight SK-6820

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What This Code Means

The panel has lost the return path for a Class A SBUS circuit.

Common Causes

  • 1Break in the SBUS wiring
  • 2Loose connection at the last device

Resolution Steps

Trace the SBUS wiring to find the break, check connections at all SBUS devices, and restore the loop continuity.

Manual References(3)

Field Notes

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Related Codes

GROUND FAULTAn earth ground fault occurs when the panel senses an unexpected flow of current from one or more of its terminals to the earth connection (Terminal 2).Printer is out of paper troubleThe system printer has run out of paper.DISABLEA point or circuit has been manually taken out of service, which prevents the activation of notification appliances or alarm initiation from that specific device.An unexpected SLC device has been IDThe panel has detected a device on the SLC loop that was not programmed into the system.Calibration trouble alertA sensor has failed its internal calibration test.

Related Questions

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All SK-6820 trouble codesSK-6820 panel page