Reported risk: This recall involves McDonnell and Miller series 750 Low Water Cut-Off control units, which in connection with a water level sensor, are used as a primary or secondary safety control on hot water or steam boilers to signal the boiler to provide protection in low water conditions. The unit is mounted on the outside of a boiler, generally near the boiler's main electrical panel. They are black and measure about 6 inches high x 5 inches wide x 2 1/2 inches deep. The units have a green LED "On" light, a red LED "Low Water" light and test and manual reset buttons on the top. "McDonnell and Miller," "Guard Dog," "Low Water Cut-Off" and model numbers 750-MT-120, 751-MT-120, 751P-MT-120 or 752P-MT-24 are printed on a white label on the outside of the unit. Date codes G41 or H41 are inked on the inside back plate. Hazards: The ground wire and probe wires could be incorrectly assembled in the units by the manufacturer, posing fire and explosion hazards.
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