I have power to the unit and the lights come on but I do not get power to the heaters. (Units sold before 2015)
by ETI Staff | Jul 26, 2017 | SST-2 Heat Trace FAQs
When wiring the SST-2 the white and red wires of the controller must be wired together for the unit to have power. This is regardless of the voltage applied to the unit. The white wire powers the controller and the red wire goes to the contact of the internal relay to power the heaters.