Zoeller M53 Switch Failure

Short demo showing replacing the float switch on a zoeller sump pump.

Zoeller m53 switch failure.

Arcing may have caused switch contacts to weld together in closed position. Clean or replace if plugged. Pump will not shut off debris under float assembly float bound by basin sides or other switch damaged or out of adjustment. Replace switch if defective.

The switch would get stuck in the high position. The constant expansion and contraction of the rubber in the grommet around the float arm causes it to wear faster and once you get water in the switch housing it s going to fail. Oeerus o e u od ouse a 100 factory tested model 53 features. Purchased this replacement kit for my zoeller m53.

Examine points and other parts of switch for defects. While the rest of the machine is built to withstand virtually any kind of punishment you can think to throw its way the float switch tends to flame out relatively quickly. Float switch tether length too short check valve stuck open or none installed in long distance line overload open bidding sump pit too small. The m98 is more expensive than the m53 but both are affordable on any household budget less than 200.

Model 53 sump effluent or dewatering pumps fm2958 0720 supersedes. I purchased this kit a year after installing my m53 when it started behaving weirdly. When no water is delivered check prime of pump and well piping. With the higher cost the m98 provides a higher flow rate of 72 gallons of water per hour thanks to the 1 2 hp motor compared to 43 gph and 1 3 hp on the m53.

That said a supply house near me carries little giant chinese made zoeller and hydromatic copies and claims that their m53 copy has a better seal around the float arm. Remove tubing and blow through it. The biggest issue consumers have with the zoeller m53 mighty mate submersible sump pump 1 3 hp is its float switch. Tubing to pressure switch plugged.