Air Humidifier

The other day I was doing laundry and happened to notice the Aprilaire humidifier control installed on my HVAC system was indicating the relative humidity was 60%. This seemed odd to me since I have never noticed the humidifier operating during the summer. Then I talked to my HAVC installer and found my humidifier control is wired to only operate the humidifier during a heat call. Even though the humidifier control will only control humidity up to 45% relative humidity, it will measure relative and display humidity up 99%. Since my heat is never on during the summer, the reading on the control is the relative humidity the last time the heat ran.