How do I check to see if the contactor needs to be replaced on my nu-wave spa supreme series (2 pole heating element)? There is no power coming off the side that conects to the heating element.

See if control voltage is present, if so, connection should be made between line and load side. If not, Coil on contactor is open.
240 volts needs to be present on load side, with CORRECT voltage on coil.