A submersible drainage pump is a dependable tool for removing unwanted water from basements, construction sites, and flooded areas. But like any piece of equipment, it can develop issues over time. The good news is that many common problems can be solved with simple troubleshooting steps — often without the need for costly repairs or replacements.
In this guide, we’ll cover the most common drainage pump problems and how to fix them.

1. Pump Won’t Start
Possible Causes:

• Power supply issues (unplugged cord, tripped breaker, blown fuse)
• Faulty or stuck float switch
• Burned-out motor

Solutions:

• Check if the pump is plugged in and receiving power.
• Reset the breaker or replace the fuse.
• Test the float switch by lifting it manually to see if the pump starts.
• If the motor is silent or overheated, consult a professional for repair or replacement.

2. Pump Runs But Doesn’t Discharge Water
Possible Causes:

• Clogged inlet screen
• Blocked or frozen discharge pipe
• Airlock in the pump
• Impeller jammed or broken

Solutions:

• Turn off the pump and clean the inlet screen.
• Inspect the discharge line for kinks, debris, or ice.
• To clear an airlock, tilt the pump slightly or loosen the discharge fitting to release trapped air.
• If the impeller is damaged, it may need replacement.

3. Pump Starts and Stops Frequently (Short Cycling)
Possible Causes:

• Faulty check valve allowing water to flow back into the sump
• Float switch improperly positioned or stuck
• Sump pit too small for pump capacity

Solutions:

• Inspect and replace the check valve if needed.
• Ensure the float switch moves freely without obstructions.
• If the pit is too small, consider resizing or upgrading to a pump better suited for the application.

4. Pump Runs Continuously Without Shutting Off
Possible Causes:

• Float switch stuck in the “on” position
• Excessive water inflow (during heavy rain or flooding)
• Motor or switch malfunction

Solutions:

• Inspect the float switch for obstructions.
• Check if the water inflow is too high for the pump’s capacity — if so, upgrade to a higher-capacity pump.
• If the pump keeps running even with low water, the switch or motor may need servicing.

5. Pump Is Too Noisy or Vibrates Excessively
Possible Causes:

• Debris caught in the impeller
• Pump not sitting level in the sump pit
• Worn-out bearings or motor issues

Solutions:

• Turn off the pump and clean out any debris.
• Reposition the pump on a level, stable surface.
• If noise persists, the motor bearings may need lubrication or replacement by a technician.

6. Pump Overheats or Shuts Down
Possible Causes:

• Running dry without water
• Blocked intake or discharge restricting water flow
• Electrical issues in the motor

Solutions:

• Never run the pump without water — it relies on water to cool the motor.
• Clear any clogs in the inlet or discharge line.
• If overheating continues, consult a service professional.

7. Water Is Not Being Fully Removed
Possible Causes:

• Float switch set too high
• Pump capacity too low for the application
• Sediment buildup at the bottom of the sump pit

Solutions:

• Adjust the float switch to activate at a lower water level.
• Upgrade to a pump with higher flow rate or head capacity.
• Clean the sump pit regularly to prevent sediment buildup.

A submersible drainage pump is only as reliable as its maintenance and setup. By understanding these common problems — from clogged inlets and stuck floats to electrical faults — you can troubleshoot quickly and keep your pump working efficiently.
Regular cleaning, routine testing, and prompt repairs not only prevent breakdowns but also extend the life of your drainage pump, ensuring it’s ready when you need it most. For more info contact Submersible Pump Suppliers in UAE or call us at +971 4 2522966.