Warning: Your Banging Sump Pump Could Indicate a Hidden Danger

Sump pumps are essential appliances for keeping basements and crawlspaces dry. However, they can sometimes develop an annoying problem: a loud banging noise. If you’re wondering “why sump pump makes loud banging noise,” you’ve come to the right place. In this comprehensive guide, we’ll explore the various reasons behind this issue and provide solutions to restore peace and quiet to your home.

1. Air in the Pump

One of the most common causes of a banging sump pump is the presence of air in the pump. When the pump starts, air can get trapped inside and compress. As the pressure builds up, the air is released suddenly, creating a loud banging sound.

Solution:

• Check the pump’s discharge line for any kinks or blockages that may prevent air from escaping.
• If the discharge line is clear, try priming the pump by pouring water into the pump basin until it reaches the fill line.

2. Loose Impeller

The impeller is a rotating blade inside the pump that moves water. If the impeller becomes loose, it can wobble and hit against the pump housing, causing a banging noise.

Solution:

• Turn off the power to the pump.
• Remove the pump cover and inspect the impeller.
• Tighten any loose screws or bolts that secure the impeller.

3. Worn Bearings

The bearings in the pump allow the impeller to rotate smoothly. Over time, these bearings can wear out and cause the impeller to wobble, resulting in a banging noise.

Solution:

• Replace the worn bearings. This is a more advanced repair that may require the assistance of a plumber.

4. Debris in the Pump

Debris such as sand, gravel, or leaves can get into the pump and clog the impeller or discharge line. When the pump tries to operate, the debris can cause the impeller to hit against the pump housing or the discharge line to vibrate, creating a banging noise.

Solution:

• Clean the pump basin and remove any debris.
• Inspect the discharge line for any blockages and clear them.

5. Malfunctioning Check Valve

The check valve is a device that prevents water from flowing back into the sump basin after the pump has turned off. If the check valve fails, water can flow back into the basin and cause the pump to start and stop repeatedly, resulting in a banging noise.

Solution:

• Replace the malfunctioning check valve. This is a relatively simple repair that you can do yourself.

6. Improper Installation

If the sump pump is not installed properly, it can cause a banging noise. For example, if the pump is not level, it can cause the impeller to wobble and hit against the pump housing.

Solution:

• Check if the pump is level using a level.
• If the pump is not level, adjust the leveling feet to level it.

7. Faulty Electrical Connection

A faulty electrical connection can cause the pump to operate intermittently, resulting in a banging noise. Loose wires or a damaged electrical cord can also create a buzzing or humming sound.

Solution:

• Check the electrical connections to the pump.
• Tighten any loose wires and replace any damaged electrical cords.

Wrap-Up: Restoring Peace and Quiet

A loud banging sump pump can be a frustrating problem, but it’s usually not difficult to resolve. By following the steps outlined in this guide, you can identify the cause of the noise and restore peace and quiet to your home. Remember to always turn off the power to the pump before performing any repairs.

Popular Questions

Q: Can I fix a banging sump pump myself?
A: Yes, you can fix most of the common causes of a banging sump pump yourself, such as removing debris, tightening loose parts, or replacing the check valve. However, more advanced repairs, such as replacing bearings or fixing electrical connections, may require the assistance of a plumber.

Q: How often should I clean my sump pump?
A: It’s recommended to clean your sump pump at least once a year, or more often if you live in an area with a lot of rain or flooding.

Q: What are the signs of a failing sump pump?
A: Some signs of a failing sump pump include:

• Loud banging noises
• Intermittent operation
• Water backing up into the sump basin