I'm sorry, That's all I have. You can try cleaning the phone jack plugs on the thermostat but I doubt that is the problem. You might try resetting your Aqua Hot and then reset the thermostat again.
AHE-100-02S Service Manual Rev. B 9-27-2011.pdf
AHE-100-02S_Parts_Manuals_Rev_B.pdf
AHE-100-02SAqua-HotOwnersManual05-02.pdf