iWorx® SMZ1
26
505-048-2, Effective: March 10, 2015
© 2015 Taco Electronic Solutions, Inc.
Troubleshooting Tips
Getting Help
Components within an iWorx® controller, sensor, or power supply cannot be field repaired. If there is a problem with a
unit, follow the steps below before contacting your local TES representative or TES technical service.
1.Make sure controllers, sensors, and power supplies are connected and communicating to desired devices.
2.Record precise hardware setup indicating the following:
Version numbers of application software.
Device and/or firmware version number.
A complete description of difficulties encountered.
Notes:
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.
A zone pilot relay will not come on even
though the LCI indicates it is on.
Ensure that the controller and output pilot relay have been powered with 24
VAC
and the output has been correctly wired to the coil of the pilot relay. Also ensure
that the pilot relay has a 24
VAC coil. Ensure that the output jumpers are in the
right position for this application (isolated group, power sourcing or power sink-
ing).
The 10K thermistor reading is out of
range.
The input is either shorted or open, or the dip switches are not set. Make sure
the appropriate dip switch for this input is in the VTH “On” and 5V “Off“ position.
Thermistor readings fluctuate rapidly,
sometimes by several degrees.
The controller is not properly grounded. The controller’s ground (GND) pin (T40)
must be connected to earth ground.
Also ensure that the controller’s digital inputs are dry contacts and that no volt-
age is being applied or switched to the inputs.
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).
Why is my pump short cycling?
Ensure that the temperature inputs and controller are properly grounded and
that the PI Gain is set properly.
What should I do with unused inputs?
The installer may want to place dummy 10K resistors across unused inputs to
prevent confusion from aberrant readings. Any unused snow sense inputs
should be left open and will read approximately 30 °F.
