Frequently Asked Questions


HOW LONG IS YOUR WARRANTY PERIOD?

36 months from date of manufacture (on most residential Zoeller pumps). Abuse or misapplication can void this warranty. We have authorized warranty and service repair stations located throughout the United States. Check with individual products for specific warranty information.

WHAT IS THE ESTIMATED SERVICE LIFE OF THE PUMP?

Under normal service conditions, we feel that the unit is designed for a 7-10 year service life. But during this period, the pump may require periodic servicing.

DO I NEED A CHECK VALVE?

In a sewage system a check valve is required to prevent the sewage from draining back to the basin. They are usually recommended for all other submersible pump systems, but not required.

MY AUTOMATIC PUMP STOPS AND STARTS CONSTANTLY, HOW CAN I MAKE THE PUMP RUN LONGER?

A pump short cycling is a function of the basin diameter and the "on/off" pumping range. Since the basin is in the ground it is unlikely that it can be enlarged. If you have an automatic unit which has a self contained float switch the "on/off" pumping range cannot be adjusted. But with a non automatic unit controlled with a pump switch you can have flexibility in the pumping range adjustment. Short-cycling can decrease the service life of a switch assembly. If this occurs, an automatic unit can be converted by using a long-cycle kit (P/N 10-0001) or by using a non-automatic pump with a piggyback variable level switch, which will expand its pumping range and decrease the amount of short-cycling. Installing a check valve in the discharge line will help decrease short cycling.

MY PUMP MAKES A LOUD NOISE EVERY TIME IT STOPS. WHAT'S WRONG?

The noise you hear is the check valve closing. When the flow reverses in the discharge pipe after the pump stops, this slamming effect (Water Hammer) occurs.

MY PUMP IS HUMMING BUT NOTHING IS BEING PUMPED. WHAT'S WRONG?

The pump is probably air locked. If you have a check valve in the system make sure your 3/16" (5 mm) vent hole has been drilled and it is not clogged. If it has not been drilled, disconnect the pump from your power source and drill the hole (See questions #1&4). If the vent hole solution is not the problem, remove the pump from the pit after disconnecting the power and piping and make sure the impeller rotation is not being restricted.

I HAVE TO SHAKE THE DISCHARGE PIPE TO GET IT TO RUN. WHAT'S WRONG?

If you have an automatic unit with an integral float switch, the switch assembly is malfunctioning and the switch, switch arm, and case gasket should be replaced. The average switch life is 4-7 years but may be higher or lower depending on the application. If you have a non automatic pump with a variable level float, it may be hung up on something or needs to be replaced.

MY PUMP BURNED UP AFTER ONLY 3 YEARS IN SERVICE. WHAT'S WRONG?

First, determine whether or not your pump is burned up by checking out the motor's winding resistance. If it checks negative you may not be able to repair the unit. If the motor is OK, the pump can be repaired at a reasonable price. If your pump has burned up you will want to make sure that your pump is sized properly and the voltage powering the pump is rated the same as the pump and sufficient to handle the load. Do not use extension cords. Make sure the temperature of the liquid being pumped is within the rating of the pump. Finally, make sure that the system head is at least the minimum head that the pump is rated at. If your pump is pumping at a low or negative head you will be overloading the motor with each duty cycle and shorten the service life of the pump.not use extension cords. Make sure the temperature of the liquid being pumped is within the rating of the pump. Finally, make sure that the system head is at least the minimum head that the pump is rated at. If your pump is pumping at a low or negative head you will be overloading the motor with each duty cycle and shorten the service life of the pump.

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