Troubleshooting; Unit Communication Fault - Trane Symbio 700 Controller Application Manual

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:
ACC-APG002A-EN
Module
Symbio 700 Onboard I/O
Customer Options Module
Indoor Options Module
Fresh Air Options Module
Stepper Motor Module
Symbio 700 Response
• 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
• 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 after
seven seconds
• 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)
– HGRH/Dehumidification control will be
discontinued
• Set Diagnostic: Unit Communications Failure
• Fresh Air Options Module Communication Status =
Not Communicating
• All unit functions that have dependencies on data
from other modules will be discontinued
– All economizing operation is discontinued
• Set Diagnostic: Unit Communications Failure
• Stepper Motor Module Communication Status = Not
Communicating
• All unit functions that have dependencies on data
from other modules will be discontinued
– All HGRH functionality will be discontinued
– All Compressor related functionality will be
discontinued
Response Type
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
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