I have a Great Lakes hot tub with a Brett Aqualine spa pack in it. I have replaced both contactors and both relays. When it calls for heat it will hang up between calling for heat and not calling for heat making this awful contactor chatter noise. If you turn the dial higher or lower when it does the noise it will stop. It is like the temp setting will not pull in the contactor and it hangs up between calling and not calling for heat. I was going to replace the Tecmark 2 button controller next I guess. Any help is appreciated.