[[SOLVED] Red light flashing after turned off stereo unit on Hotspring Grandee [IQ2020]]

I found and the problem. The audio amp is linked to main control unit with both AC power en I2C connection. I unplugged the I2C cable on main board and it works back. I also unplugged the wireless audio unit and its I2C connection to IQ2020. Problem solved.

[[SOLVED] Red light flashing after turned off stereo unit on Hotspring Grandee [IQ2020]]

Hi,

Curious, it worked well until I turned off stereo amp unit. Then it stopped and just the recirculating pump is on. No more display. I shutoff the breaker ad shut it back, it seems ton restart, display panel turn on and turnoff after a few seconds. 

Is there a link between the audio unit and the main control other than power supply?