Nortec On Digital Wall & Duct Humidistat - Manual (Page 4)

4 | Introduction
Figure 4: Duct Sensor Dimensions
Table 3: Troubleshooting
Display Cause
Symptoms
Corrective Action
ALA3
The controller will initiate
this alarm if the humidity
sensor reports a relative
humidity below 6%.
The LCD screen will report
the message ALA3. The
controller will negate output
until a relative humidity
above 6% is report to the
controller from the sensor.
Normal operation resumes once the sensed humidity is
above 6% RH. The message will remain on the LCD screen
until removed by pressing the option button on the control
panel. If this error persists verify that the wiring is correct.
Also verify that the sensor is mounted in an area that
accurately represents the controlled humidity level.
ALA4
The controller will initiate
this alarm if the humidity
sensor reports a relative
humidity above 95%.
The LCD screen will report
the message ALA4. The
controller will negate output
until a relative humidity
below 95% is report to the
controller from the sensor.
Normal operation resumes once the sensed humidity is
below 95% RH. The message will remain on the LCD screen
until removed by pressing the option button on the control
panel. If this error persists verify that the wiring is correct.
Also verify that the sensor is mounted in an area that
accurately represents the controlled humidity level.
Note: If at any time this troubleshooting guide fail s to provide the information needed Nortec’s Technical Support Department can be
reached at 1-866-NORTEC-1 to provide assistance.