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ACC-APG001A-EN
Troubleshooting
The Symbio 700 controller provides system shutdown, operational default operation, and
communication error handling of the Odyssey unit. The list of fault conditions below will stop
normal operation or change the operation of the unit to a default condition. Faults are indicated
in the Active Alarm menu of the onboard user interface and the Symbio Service and Installation
mobile app.
Unit Communication Fault
The maximum time for the inter-module communications (IMC) bus is 15 seconds. If 15 seconds
passes with no valid communications received from any of the Options modules, the Symbio 700
takes the following actions:
Module Symbio 700 Response
Response Type
Symbio 700 Onboard I/O
• Set Diagnostic: Unit Communications Failure
• On-Board I/O Communication Status = Not
Communicating
• All unit functions will be shut down and I/O
will go to their comm. loss state
Auto Reset
Customer Options Module
• Set Diagnostic: Unit Communications Failure
• Customer Options Module Communication
Status = Not Communicating
• All unit functions that have dependencies on
data from other modules will be discontinued
– Ventilation Override functionality is
discontinued
– Alarm Indicator function is discontinued
Auto Reset
Indoor Options Module
• Set Diagnostic: Unit Communications Failure
• Indoor Options Module Communication Status
= Not Communicating
• All unit functions that have dependencies on
data from other modules will be discontinued
– All Electric Heat operation is discontinued
– Discharge Air Temperature dependent
control discontinued (SZVAV)
Auto Reset
Sensor Fault
On Symbio 700, if a sensor value goes outside of its minimum or maximum range, the point goes
into an Alarm State. If the point in the Alarm State, we consider the sensor failed and take the
following actions:
Fault Symbio 700 Response
Response Type
Space Temperature Active
• Annunciated in the Active Alarm list.
• For specific unit operational response, see
Space Temperature Control (CVZT/VVZT)
section of this document.
Auto Reset
Discharge Air Temperature Local
• Annunciated in the Active Alarm list.
• For specific unit operational response, see
Space Temperature Control (CVZT/VVZT)
section of this document.
Auto Reset
Outdoor Air Temperature Active
• Annunciated in the Active Alarm list.
• Heat Pump Low Ambient functionality is
disabled.
Auto Reset
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