The contactors should make a click when activated, but if they are buzzing, then you probably have the wrong type of coil for what's connected to the coil (DC rather than AC coil, wrong coil voltage, etc.) What is the exact PN of your contactor, and what voltage is wired to the coil?
The DSPR1 does not require a temp probe in order to operate. All of the DSPRxxx models do require a temp probe before they will operate (as do all ordinary PID's.) Think about it. If the controller doesn't know what the temp is, it doesn't know how much power to apply to maintain temperature, or in heat to boil mode, know when to back off power as boil temp nears.
Brew on