Veryify first that you have 240vac between the black and red wires at the terminal block. When operating, you should have 240vac when you measure accross the element, but you need to check the thermal cut-out and the high limit thermostat for continuity. Both are attached to the heater housing. If they check OK, check the operating thermostat attached to the blower duct for continuity. Any of these item's will prevent heater operation.
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