The temperature controller on my Delatech 858 has four dashes (- - - -) across the readout and our tool is not heating up. What do we check?

9 breaks of 10 this is an open thermocouple. Detach the thermocouple and "ohm it out"-- if it is open it is bad. If it is closed, then change the controller by taking it straight from the front (do not attempt to take it out though the back of the device).If you wind up requiring a brand-new

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