Diagnostics
CNT-SVX12C-EN 79
Table of diagnostics
Table 28 describes each diagnostic that can be generated by the Tracer
ZN517.
Table 28. Diagnostics for the ZN517 unitary controller
Diagnostic Probable cause Consequences
Diagnostic
type
P Normal Default value until power-up
control wait expires
None N/A
Normal Default value after power-up
control wait expires
None N/A
Local Space Setpoint Failure Invalid or missing value for
space setpoint
The controller uses default values. Informational
Maintenance Required The maintenance required
timer has expired
Informational warning only. Informational
Local Fan Switch Failure BI2 has not seen a contact
closure for 60 seconds, indi-
cating fan proving
All binary outputs are disabled. Automatic
CO
2
Sensor Failure CO
2
input is invalid or
missing
Demand control ventilation is
disabled.
Automatic
Discharge Air Temp Failure Discharge air temperature
input is invalid or missing
All binary outputs are disabled. Automatic
Invalid Unit Configuration Invalid DIP switch setting Controller will not operate. Automatic
RH Sensor Failure Relative humidity input is
invalid or missing
Dehumidification is disabled. Automatic
Space Temperature Failure Space temperature sensor
is invalid or missing
All binary outputs are disabled. Automatic
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