CNT-SVX06B-EN 67
Chapter 9
Troubleshooting
Use Table 20 through Table 25 to assist you in diagnosing any of the fol-
lowing operational problems that you might encounter with the Tracer
ZN511 zone controller:
• Fan does not energize (Table 20)
• Valves remain closed (Table 21 on page 68)
• Valves remain open (Table 22 on page 68)
• Compressors are not running (Table 23 on page 69)
• Electric heat does not energize (Table 23 on page 69)
• An outdoor air damper stays closed (Table 24 on page 70)
• An outdoor air damper stays open (Table 25 on page 70)
Table 20. Fan does not energize
Probable cause Explanation
Unit wiring The wiring between the controller outputs and the fan relays and contacts must be
present and correct for normal fan operation. Refer to applicable wiring diagram.
Failed end device The fan motor and relay must be checked to ensure proper operation
Random start
observed
After power-up, the controller always observes a random start from 0 to 25 seconds. The
controller remains off until the random start time expires.
Power-up control-wait If power-up control-wait is enabled (non-zero time), the controller remains off until one of
two conditions occurs:
1) The controller exits power-up control-wait once it receives communicated information.
2) The controller exits power-up control-wait once the power-up control-wait time expires.
Cycling fan operation If configured to cycle with capacity, normally the fan cycles off with heating or cooling.
The heating/cooling sources cycle on or off periodically with the fan to provide varying
amounts of capacity to the zone.
Unoccupied operation Even if the controller is configured for continuous fan operation, the fan normally cycles
with capacity during unoccupied mode. While unoccupied, the fan cycles on or off with
heating/cooling to provide varying amounts of heating or cooling to the space.
Fan mode off If a local fan mode switch determines the fan operation, the off position controls the fan
off.
Requested mode off You can communicate a desired operating mode (such as off, heat, and cool) to the con-
troller. If off is communicated to the controller, the unit controls the fan off. There is no
heating or cooling.
Diagnostic present A specific list of diagnostics affects fan operation, depending on whether the unit is con-
figured as 1 heat/1 cool or a water-source heat pump. For more information, see Table 18
on page 62 and Table 19 on page 64.
No power to the con-
troller
If the controller does not have power, the unit fan does not operate. For the Tracer ZN511
controller to operate normally, it must have an input voltage of 24 Vac. If the green LED is
off continuously, the controller does not have sufficient power or has failed.
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