iWorx® VAV Series
12
502-011, Effective: March 16, 2011
© 2011 Taco Electronic Solutions, Inc.
TROUBLESHOOTING
Diagnostic LEDs
The controller has 4 LED indicators. These indicators can aid in troubleshooting equipment operation problems. The
following table lists the functions of the controller’s LEDs in the order they appear from left to right on the unit.
Figure 3: Terminal Unit Controller Controller LEDs
Service (SRV)
Status (RUN)
Network (WNK)
Fault (FLT)
Troubleshooting Tips
The following table provides tips on resolving common issues.
LED Indication
Status
– Solid green when running and configured by an LCI
– Flashing green when running and NOT configured by an LCI
Network
– Yellow while the controller is transmitting data onto the FTT-10A network
– Green when there is network activity
– Off when there is no network activity
Fault
– Solid red when a fault condition exists
Service
– Illuminated when the service pin is pushed
Problem
Solution
Controller is not running and Status
LED is not illuminated.
No power to controller. Verify the voltage on the controller’s power connector (24 VAC).
How do I reset the controller?
The controller can be reset by the LCI, or you can cycle power to the controller. Refer to
the LCI documentation for more information on resetting the controller using the LCI.
I am using a TS303 thermostat and
cannot force the fan ON.
On the VAV Series controller, the Fan Override button is disabled. Model TS303 is not
recommended for use with VAV Series controllers.
On other iWorx® controllers, the sta-
tus LED will turn Red when the con-
troller has entered a fault mode that
requires a reset. Are there any such
modes on the VAV Series?
Yes, but it doesn't require a reset. As with any of the controllers, if the controller detects
that no TS300 series sensor is present, an alarm is issued, the controller enters fault
mode, and the LED is turned red. However, this type of failure doesn't require a manual
reset.
Can VAV Series controllers have
independent schedules?
Yes, each VAV Series controller on the network can be part of a different LCI group con-
taining a different schedule. Remember the LCI is limited to 16 groups and 16 sched-
ules.
