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Diagnostics
CNT-SVX07C-EN 59
Smart reset diagnostics
After the controller detects the first smart reset diagnostic, the unit waits
30 minutes before initiating the smart reset function. If another diagnos-
tic of this type occurs again within 24 hours after an automatic clearing,
you must clear the diagnostic manually by using any of the ways shown
for “Manual (latching) diagnostics.”
Informational diagnostics
Informational diagnostics provide information about the status of the
controller. They do not affect machine operation. They can be cleared from
the controller using any of the ways shown for “Manual (latching) diag-
nostics.”
Table of diagnostics
Table 16 The tables present each diagnostic that can be generated by the
Tracer ZN521, its effect on outputs (consequences), and its type.
Note:
The generic binary output is unaffected by diagnostics.
Table 16. Diagnostics
Diagnostic Probable cause Consequences
Diagnostic
type
Maintenance Required Fan run hours exceed the
time set to indicate filter
change
Fan unaffected
Valves unaffected
Electric heat unaffected
Face and bypass damper unaffected
Informational
Condensate Overflow The drain pan is full of
water
Fan off
Valves closed
Outdoor air damper closed
Face and bypass damper bypass
DX/electric heat off
Baseboard heat off
Manual
Low Coil Temp Detection The leaving fluid temper-
ature may be close to
freezing
Fan off
Valves open
Outdoor air damper closed
Face and bypass damper bypass
DX/electric heat off
Baseboard heat off
Smart reset/
Manual
Low Airflow—Fan Failure The fan drive belt, con-
tactor, or motor has
failed.
Fan off
Valves closed
Outdoor air damper closed
Face and bypass damper bypass
DX/electric heat off
Baseboard heat off
Manual