It does but it doesnt affect it , I have been reading up a bit and it seems it has a humidity sensor that sometimes gets covered with fabric softener and it affects the reading.. Sensor is a 3$ part, now i'm trying to find where the sensor is inside that beast, looking for a schematic.. I have a feeling it needs a good cleaning after 11 years of use.. I have seen quite a built up of lint when I cleaned the exhaust vent from the outside of the house..