iWorX® ALM2
18
505-013, Effective: November 12, 2010
© 2010 Taco Electronic Solutions, Inc.
Figure 6: Diagnostic LEDs
Status
Network
Service
Troubleshooting Tips
The following table provides tips on resolving common issues.
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 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 jumper is configured for how the
output is wired; for example Power Isolated vs Power Sourcing.
A temperature reading is at its mini-
mum or maximum value.
The input is either shorted or open. Check the wiring for the indicated sensor. Ensure
that the input switch is in the proper position for dry contact or thermistor.
Thermistor readings fluctuate rap-
idly, sometimes by several degrees.
The controller may not be 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 voltage is being applied or switched to the inputs.
Can I have a different hysteresis for
each input?
No, the same hysteresis applies to all analog inputs, as well as to the high and low
limits.
An alarm indicator is on when it
should be off, and off when it should
be on.
Make sure that you are using the correct type of switch (normally open or normally
closed) and that the configuration of the input as shown at the LCI matches the type
of switch you are using.
