I'm not familiar with the Aqua-Hot system but I have experience with the FireFly system.
I would call or e-mail FireFly and explain your situation.
Contact | Firefly Integrations
I have used their Technical Support on two occasions and they have helped me diagnose and resolve issues.
You could need a firmware update or you could have a hardware problem. They should be able to help you diagnose your problem.
My system has a G7 Main Control board that had to be replaced because I was having issues with it properly controlling my two A/C units. There would be times only the A/C fans would run even though the thermostat called for cooling and there were times only the compressor would run and not the fans. I had the G7 controller replaced in June under warranty and I have not had any issues since.