IAQ Dehumidify not working
We have an IAQ thermostat with a Trane XL14i heat pump with a variable speed air handler connected through a Honeywell HZ322 zone panel. It's been in use for 4-5 years and I've never tried to use the system to dehumidify with the AC until now. AC and heat operations works fine.
The AC will run if I run the dehumidify option in the installer's test menu. However, I cannot get the system to run automatically. I have the humidity set point at much lower than 5% of the actual sensed humidity. Temp set point is well over 3 degrees above room temperature.
For example, the current outside temperature is 80 degrees as displayed on the IAQ. The temp set point is 85 and the room temp is 75. The humidity set point is 50% and the room humidity is 62%.
I've been over the IAQ settings many times and I cannot determine what would be the cause. Here are some of the applicable settings:
392: 70 (for testing purposes)
System is set to cool and fan on auto. Away mode (Southern De-humidification) doesn't work either.
Any suggestions are greatly appreciated!