In software versions 13B40 and below, the Humidity Sensor Alarm occurs when the humidity exceeds 90% or when the sensor is disconnected. Humidity alarm only occurs if the sensor is disconnected in software versions after 13B40.


Possible Cause
Component to Check
Recommended Action
Low heat load, site cools down without compressor
Free cooling humidity limit (U04 in L04 Menu)
Change to 80%. For extremely small heat load site, change to 60%.
Loose/incorrect sensor wire
Sensor wire

Correct wiring. Refer to the Humidity Sensor Wiring diagram and reference the helpdesk article: Reconnecting a Loose Humidity Sensor

Defective humidity sensor
Humidity sensor
Replace Humidity Sensor

Humidity Sensor Wiring