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and specifically page 4 where the manual states that you are to ensure that there is no obstruction on or in front of the infrared sensor. Clean any dirt off the sensor lens. try adjusting the sensitivity potentiometer on the CBM blue knob. if the problem persists replace the CBM and or the sensor module.
The ASI A0036 Sensor Module for ASI 0165 Hand Dryers Can be seen here:
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and the ASI A0009 Circuit Board Module for ASI 0185 Hand Dryers Can be seen here: