I had an issue with my AqualCal Heat Pump starting up with the IntelliCenter. The "fix" was quite easy but not intuitive. The AquaCal is set up with a two pin communication wire which is recognized by the IntelliCenter when you make the interface with a GAS heater NOT a Heat Pump. This sets the communication with a two wire set-up.
Not sure if this was posted before but wanted to share.
Not sure if this was posted before but wanted to share.