Skip to content

A Comprehensive Guide to Andersen Window Sash Balancer Replacement

Andersen windows are known for their durability, energy efficiency, and classic aesthetics. However, like all components in a home, certain parts of your Andersen windows can wear out over time. One such part is the sash balancer. If your windows are difficult to open or close, it might be time for an Andersen window sash balancer replacement. This guide will walk you through the process, helping you understand what sash balancers are, why they matter, and how to replace them effectively.

What is a Sash Balancer?

A sash balancer is a crucial component in double-hung windows. It is a mechanical device that helps counterbalance the weight of the window sash, making it easier to lift and lower the window. The sash balancer ensures that the window stays in the desired position and doesn't slam shut or remain stuck open.

In Andersen windows, the sash balancer is typically a spring-loaded mechanism hidden within the window frame. Over time, the constant tension and movement can cause the sash balancer to wear out, leading to issues with the window's operation.

Signs Your Sash Balancer Needs Replacement

Before diving into the replacement process, it’s essential to identify whether your sash balancer indeed needs replacement. Here are some common signs:

  1. Difficulty Opening or Closing the Window

If your window feels heavy or difficult to move, it could be due to a faulty sash balancer. The balancer's job is to counterbalance the weight of the sash, so when it fails, the window becomes harder to operate.

  1. Window Doesn’t Stay Open

A properly functioning sash balancer will hold the window in place at any position. If the window slams shut or won’t stay open, it’s a clear sign that the balancer is not working correctly.

  1. Noisy Operation

A sash balancer should operate quietly. If you hear creaking or grinding noises when you open or close the window, it could indicate that the balancer is worn out and needs replacement.

  1. Visible Damage

In some cases, you might be able to see the damage to the sash balancer. If the balancer looks corroded, broken, or if the spring is visibly damaged, it’s time for a replacement.

Tools and Materials Needed

Before you start the replacement process, gather the necessary tools and materials. Here’s what you’ll need:

  • New Andersen sash balancer
  • Phillips screwdriver
  • Flathead screwdriver
  • Putty knife
  • Tape measure
  • Replacement clips (if necessary)
  • Safety gloves
  • Safety glasses

Steps to Replace Andersen Window Sash Balancer

Now that you have identified the need for a sash balancer replacement and gathered your tools, follow these steps to replace the sash balancer in your Andersen window:

Step 1: Remove the Window Sash

1.1 Unlock the Window

Unlock the window and raise it to a comfortable working height.

1.2 Release the Tilt Latches

Locate the tilt latches on the top of the window sash. Press the latches inward to release the sash from the frame.

1.3 Tilt and Remove the Sash

Tilt the window sash towards you until it is at a 90-degree angle. Lift one side of the sash to disengage it from the pivot pins on the window frame. Carefully remove the sash and set it aside.

Step 2: Remove the Old Sash Balancer

2.1 Locate the Sash Balancer

With the sash removed, you should be able to see the sash balancer inside the window frame channel.

2.2 Release the Balancer

Use a flathead screwdriver to disengage the sash balancer from the frame. There might be a screw or clip holding it in place. Carefully remove any screws or clips and slide the balancer out of the channel.

Step 3: Measure and Order the Correct Replacement

3.1 Measure the Balancer

Measure the length and width of the old sash balancer. Note any part numbers or manufacturer details to ensure you order the correct replacement.

3.2 Order the Replacement

Order the replacement sash balancer from Andersen or an authorized dealer, ensuring it matches the specifications of your old balancer.

Step 4: Install the New Sash Balancer

4.1 Insert the New Balancer

Once you have the correct replacement, slide the new sash balancer into the channel where the old one was located. Ensure it is seated correctly and aligned with the frame.

4.2 Secure the Balancer

If the new balancer requires screws or clips, secure it in place using the appropriate fasteners. Make sure it is firmly attached and doesn’t move.

Step 5: Reinstall the Window Sash

5.1 Re-engage the Pivot Pins

Tilt the window sash to 90 degrees again and insert the pivot pins into the balancer brackets on both sides.

5.2 Tilt the Sash Back into Place

Once the pivot pins are engaged, tilt the sash back into its normal position. Ensure it sits correctly within the frame.

5.3 Test the Window

Test the window to make sure it opens and closes smoothly. Ensure the sash stays in place at different heights and operates quietly.

Step 6: Final Adjustments and Cleanup

6.1 Adjust as Necessary

If the window does not operate smoothly, you may need to make slight adjustments to the sash balancer or check for any obstructions in the channel.

6.2 Clean the Work Area

Once the window is operating correctly, clean up any debris or tools from the work area. Dispose of the old sash balancer properly.

Maintenance Tips for Andersen Windows

To extend the life of your Andersen windows and their components, consider these maintenance tips:

  1. Regular Cleaning

Clean the window tracks and frames regularly to prevent dirt and debris buildup, which can affect the operation of the sash balancer and other components.

  1. Lubrication

Apply a silicone-based lubricant to the window tracks and moving parts to ensure smooth operation. Avoid using oil-based lubricants as they can attract dirt and grime.

  1. Inspection

Periodically inspect your windows for signs of wear or damage. Early detection of issues can prevent more significant problems and extend the lifespan of your windows.

  1. Professional Service

For complicated repairs or if you’re unsure about performing maintenance yourself, consider hiring a professional. Andersen provides service and support through authorized dealers and service providers.


Replacing an Andersen window sash balancer might seem daunting at first, but with the right tools and a step-by-step approach, it is a manageable DIY task. By following this comprehensive guide, you can restore your window’s smooth operation and ensure it continues to provide comfort, efficiency, and aesthetic appeal for years to come.

Remember, regular maintenance is key to prolonging the life of your windows. Keep an eye on the condition of your sash balancers and other components, and don’t hesitate to replace them when necessary. By doing so, you’ll enjoy the many benefits of your Andersen windows without interruption.  Contact for help!


Previous article Easy Tips for Removing & Replacing Window Spline
Next article Exploring the Kawneer Door Parts Catalog: A Comprehensive Guide