Thanks, looks pretty straight forward, line 2 passes right through the motor switch with 120v. Which I have tested, I'm positive I'm getting power through this switch. Looks like the second switch is the neutral. Then line one feeds the remaining 120v through the heater relay. If I jump out this relay then power flows and the heater comes on. So I think I'm still coming back to what closes that relay? Assuming the control boards are not defective, what tells the relay to close is the thermistor, correct? I guess I'll also have another thermistor and control as well along with the ui and motor one way or another this think is getting fixed lol.