Un hook the incoming power lines, turn the breaker back on, and carefully measure power between the 2 hot wires, not the ground. You must have 220 to 240 volts between these 2 wires, if you dont either the breaker is bad, or the wire is broken somewhere. If you have 240 volts to the heater, with the power OFF unhook the wires from both elements and use an ohm meter to test the resistance on the elements, both should be around 30 ohms and about the same, if not one is bad. Test across the elements after re connecting them and turning the power on you must have 240 volts across the elements when they are on, if you have only 120 or 0 then the trouble is the breaker or the wire.
Answers & Comments
Un hook the incoming power lines, turn the breaker back on, and carefully measure power between the 2 hot wires, not the ground. You must have 220 to 240 volts between these 2 wires, if you dont either the breaker is bad, or the wire is broken somewhere. If you have 240 volts to the heater, with the power OFF unhook the wires from both elements and use an ohm meter to test the resistance on the elements, both should be around 30 ohms and about the same, if not one is bad. Test across the elements after re connecting them and turning the power on you must have 240 volts across the elements when they are on, if you have only 120 or 0 then the trouble is the breaker or the wire.