ACC-APG001A-EN
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Fault Symbio 700 Response
Response Type
Coil Temperature Sensor 1
• Annunciated in the Active Alarm list.
• If Outdoor Air Temperature < 52° F, Demand
Defrost will be disabled and timed defrost will
be used.
Auto Reset
Coil Temperature Sensor 2
• Annunciated in the Active Alarm list.
• If Outdoor Air Temperature < 52°F, Demand
Defrost will be disabled and timed defrost will
be used.
Auto Reset
Space Humidity Sensor Annunciated in the Active Alarm list. Auto Reset
Space CO2 Sensor Annunciated in the Active Alarm list. Auto Reset
Compressor Fault
Symbio 700 supports compressor safety functionality to keep the compressors from operating in
an undesirable condition. If a compressor safety failure occurs, the following actions occur:
Fault Symbio 700 Response
Response Type
LPC Lockout For specific operation associated with the LPC
diagnostics, refer to the Compressor Protection
section of this document.
Manual Reset
Proving Lockout For specific operation associated with the proving
diagnostics, refer to the Compressor Protection
section of this document.
Manual Reset
Contactor Failure For specific operation associated with the proving
diagnostics, refer to the Compressor Protection
section of this document.
Manual Reset
VFD Fault
The following failures are derived either through direct data monitoring from the Modbus device,
or through a combination of Modbus data and additional failure criteria:
Fault Fault Detection Symbio 700 Response
Response Type
Diagnostic: Supply Fan
Failure
If while the Supply Fan
VFD is requested to run,
the VFD Running Status
from the drive is set to
False for 40 continuous
seconds, this failure will be
detected
• Diagnostic: Supply
Fan Failure will be set
to Active
• All unit functions will
be shut down
immediately
Manual Reset
Diagnostic: VFD Fault
Supply Fan – 1
When Active All unit functions will be
shut down immediately
Auto Reset
Diagnostic: VFD Supply
Fan Ground Fault – 1
When Active All unit functions will be
shut down immediately
Auto Reset
Diagnostic: VFD Supply
Fan Motor Current
Overload – 1
When Active All unit functions will be
shut down immediately
Auto Reset
Diagnostic: VFD Supply
Fan Short Circuit – 1
When Active All unit functions will be
shut down immediately
Auto Reset
Supply Fan VFD
Communication Status
If continual loss of
communication between
the controller and the VFD
has occurred for a 30-
second period, this failure
will be detected.
• Supply Fan VFD
Communication
Status will be set to
Not Communicating
• All unit functions will
be shut down
Manual Reset
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