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220V -10.5 ohms approx. 240V -13 ohms approx. If all readings are not correct, replace elements as needed. Oven heats with switch off Mercury Contactor(s) The mercury contactor has probably malfunctioned in the closed position. If there is no voltage to the operating coil, but there is high voltage at the contactor output, replace the mercury contactor. Conveyor will not run (S/N 100-4389) Voltage Supply Check incoming voltage supply at line 1 to neutral. There should be a voltage reading of 120