Form #: SIDOM.4 Page | 21 Revised: 03/19
Analog Control Troubleshooting
The following troubleshooting guide pertains to single duct cooling applications but the same
concepts can be applied to other configurations.
NOTE: For approximately 15 seconds after power is applied, no rotation will occur and one or both
of the controller/actuator LEDs will flash.
Controller
1. Check that the shaft moves freely. (Press and hold the actuator release clutch and manually
rotate the shaft.)
2. Check wiring. (See Wiring Issues section below.)
3. Check for a tripped circuit breaker to the transformer, for proper supply voltage from the
transformer (or power supply), and for enough capacity (VA) for all connected devices.
4. Check that the direction jumper is in the proper position per individual controls submittal.
5. Check the polarity and level of the input signal from the thermostat.
Wrong Rotation Direction or Stroke Range
1. Check the position of the direction jumper.
2. Check the Min and Max flow limits on the thermostat (AO1 / AO2).
3. Check the adjustable mechanical stop position.
No Pressure Output Signal from Inlet Sensor
1. Check the tubing. Tubing should be free of kinks and restrictions.
2. Check air flow and sensor. Sensor must be oriented in the correct airflow direction and free
of debris.
Wiring Issues
1. Check for correct wiring at unit and thermostat per individual controls submittal.
2. At the Controller, verify 24 VAC at terminals “~” (phase) and “-” (ground). Tolerance can be
–15% to +20% (20.4 to 28.8 VAC).
3. Verify 16 VDC at terminals “16 VDC” and “COM”
a. Tolerance is 15.0 to 17.0 VDC power supply to thermostat.
b. If not correct, disconnect thermostat and recheck.
c. If still incorrect, replace CSP controller.
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