Liberty Pump Pro 370 Troubleshooting

Liberty Pump Pro 370 Troubleshooting

This complete guide on Liberty Pump Pro 370 Troubleshooting will break down 5 common problems of this pump, including: 

  • Pump won’t run
  • Pump won’t turn off
  • Pump runs or hums but not pumping
  • Pump runs periodically when fixtures are not in use
  • Pump operates noisily

To discover the solutions to those problems, keep scrolling till the end. 

Table of Contents

Liberty Pump Pro 370 Troubleshooting [5 Problems & Solutions]

Before jumping over each troubleshooting step, make sure you disconnect the pump from the power source to avoid potential risks of electric shocks. 

1. Pump Won’t Run

Your Liberty Pump Pro 370 won’t operate or work at all if there is a problem associated with: 

  • Electrical issues like improper voltage, other interruption of power, or the fuse gets blown out
  • Switch is stuck in the Off position
  • Insufficient liquid level
  • Defective switch 

How To Fix: 

For electrical issues, I highly recommend you to call a certified electrician to have the wiring of the unit or the house’s wiring inspected. 

On other hand, if you are electrically inclined, check the fuse and ensure it doesn’t get blown out. 

Also, take your eyes at the circuit breaker and verify it doesn’t get tripped. If needed, replace the fuse or set the circuit breaker to the On position. 

Next, test the switch of the pump by moving it to the On and Off position. If the switch gets clogged by debris or corrosion, you can’t turn it to the On position. In other words, you can’t operate the pump. Turns out, you are unable to move the switch if it’s interrupted with the side of the basin. 

To resolve this issue, make sure there is enough clearance for the switch to move freely. Afterward, check the switch and ensure it doesn’t get restricted by debris. If needed, clean the obstructions in the switch so that it goes up and down like a charm. 

Thirdly, the switch will not actuate to turn on the pump if the water level is below the activation level. So, ensure the water level is allowed to rise enough to activate the switch. 

Lastly, a defective switch will prevent the pump from running. In this case, you must replace the switch to bring the pump into working condition. 

2. Pump Won’t Turn Off

The pump keeps running though you try to turn it off! If this is the issue you are experiencing, either the switch gets stuck in the On position or the switch goes bad. 

The switch of the pump is prone to corrosion as it deals with water. If it gets corroded or restricted by debris, you can’t move the switch freely. 

Besides, a bad switch could cause the unit to keep running. 

How To Fix: 

Inspect the switch for restrictions. If needed, release the obstructions from the switch to let it move to the On and the Off position freely. 

However, if cleaning the switch doesn’t bring any luck, replace the switch with a new one. If you don’t know how to make the replacement, check out this short video:

3. Pump Runs or Makes A Hum But It Doesn’t Pump Water

You hear the operating noise of the pump or the pump makes a hum… 

But the heck is- it doesn’t pump a single drop of water from the basement even though it makes a humming noise. It occurs due to one of the following reasons: 

  • Restricted discharge line
  • Improper installation of the check valve
  • Closed gate or ball valve
  • Total head is beyond pump’s capability 
  • Pump impeller gets clogged 

How To Fix: 

To begin with, check the discharge line of the unit for blockage. If it gets clogged by dirt or debris, water fails to pass through it. Similarly, if the discharge is going through or into a cold area, it may get restricted by ice. 

Clean the discharge line by detaching it from the pump. Once you clean the discharge line, reattach it to the system.

Next, take a look at the check valve for proper installation. If you install it backwards or it is stuck closed, the check valve won’t work as intended. Regarding this, remove the check valve and inspect it for freedom of operation and proper installation. 

In addition, verify the ball valve is open. 

Moreover, the pump fails to move any water if the total head (lift height) goes beyond the capacity of the system. To resolve this issue, I recommend you route the piping to a lower level. If there is no option to route the piping, it will be better to replace the pump with larger capacity or consult with Liberty Pump Tech Support. 

And last not the least, you can’t expect the pump to move the water if its impeller gets clogged. 

In this case, you must remove the impeller and clean it. To do so, remove the pump from the basin and take out both the cutter & the cutter plate. Now, clean the area around the impeller. 

Once you clean the impeller’s area, reassemble everything back into place and complete the installation task. 

4. Pump Runs Periodically When Fixtures Are Not In Use

It happens because of: 

  • A check valve that is stuck open or the valve is leaking or installed improperly
  • Leaking fixtures 

How To Fix: 

Start by examining the check valve for proper installation & operation. Ensure it’s not leaking or stuck open. If needed, remove the check valve and install it again by maintaining the installation instructions. 

Afterward, check the fixtures and verify they are not leaking water. Repair the fixtures if needed to eliminate leakage.

5. Pump Operates Noisily

The Liberty Pump Pro 370 will make a loud noise while operating if: 

  • Foreign objects get stuck in the impeller cavity 
  • Broken impeller 
  • Bearings are worn out
  • Piping attachments to building are too rigid

How To Fix: 

First off, check the impeller for foreign objects. 

What you need to do, in this case, is- take out the pump from the basin. Then, remove the cutter and the cutter plate. Now, take a look into the impeller cavity and clean the area around the impeller. Afterward, replace everything in their place to complete the installation. 

Secondly, inspect the impeller thoroughly and ensure it doesn’t get broken. If it is, take consultation from Liberty Pumps to learn further about impeller replacement. 

Similar to replacing the impeller, I highly suggest you contact Liberty Pump Tech Support to replace the worn out bearings. 

For the too rigid piping attachments, it will be better to replace a portion of the discharge pipe with a rubber hose or connector. 


Like every electric appliance, Liberty Pump Pro 370 is not beyond malfunction. Over time, it won’t function as intended or operate noisily. To resolve such issues, this guide on Liberty Pump Pro 370 Troubleshooting comes into play. 

Follow the troubleshooting steps I mentioned and fix a specific problem. If you are not mechanically or technically inclined, don’t hesitate to call a certified plumber to check your pump professionally.  

Keep in mind; Liberty Pumps, Inc. is not liable for any damage that may occur due to disassembly in the field.

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