How to Change Chime on a Nutone Doorbell

Changing the chime on your Nutone doorbell is easier than you think. This guide walks you through every step—from identifying your model to installing a new chime—with clear instructions and safety tips. Upgrade your doorbell sound in under an hour with confidence.

Key Takeaways

• Turn off power first: Always shut off the circuit breaker before working on your doorbell to avoid electrical shock.
• Know your model: Identify your Nutone chime model (e.g., LA170, LA200) to ensure compatibility with replacement parts or new units.
• Use a voltage tester: Confirm the power is off before touching wires—safety is non-negotiable.
• Label wires during removal: Take photos or use tape to mark wires so you can reconnect them correctly.
• Choose the right replacement: Nutone offers mechanical, electronic, and wireless chimes—pick one that fits your home’s wiring and style.
• Test before finalizing: Power the system back on and test the chime before reassembling the cover.
• Call a pro if unsure: If you’re uncomfortable with electrical work, hire a licensed electrician for peace of mind.

Introduction: Why Change Your Nutone Doorbell Chime?

Your doorbell is more than just a notification—it’s the first sound guests hear when they arrive. Over time, the chime inside your Nutone doorbell can wear out, become too quiet, or simply feel outdated. Maybe you’ve moved into a new home with an old, tinny chime, or perhaps you’re renovating and want a modern, melodic tone that matches your style. Whatever the reason, changing the chime on a Nutone doorbell is a straightforward DIY project that can make a big difference in your home’s curb appeal and functionality.

In this comprehensive guide, we’ll walk you through every step of replacing or upgrading your Nutone doorbell chime. Whether you’re swapping out a broken mechanical chime for a new one or upgrading to a sleek electronic model with multiple tones, you’ll learn how to do it safely and correctly. We’ll cover everything from identifying your current model and turning off the power to wiring the new chime and testing the system. By the end, you’ll have a doorbell that not only works reliably but also sounds great.

This guide is designed for homeowners with basic DIY skills. No advanced electrical knowledge is required—just a few tools, patience, and attention to safety. We’ll also include troubleshooting tips and answers to common questions so you can avoid common pitfalls. Let’s get started!

What You’ll Need

Before you begin, gather the following tools and materials. Having everything ready will make the process smoother and safer.

• Screwdriver set: Typically a Phillips and flathead screwdriver for removing covers and terminals.
• Voltage tester (non-contact): Essential for confirming the power is off before touching wires.
• Replacement chime unit: Make sure it’s compatible with your Nutone model (more on this below).
• Wire strippers (optional): Useful if you need to trim or re-strip wire ends.
• Electrical tape: For securing wire connections if needed.
• Needle-nose pliers: Helpful for gripping small wires or terminals.
• Camera or smartphone: To take reference photos of the wiring before disconnecting.
• Safety glasses: Protect your eyes from dust or debris when removing the old unit.

Most of these items are common household tools. If you don’t have a voltage tester, consider picking one up—it’s a small investment that can prevent serious injury.

Step 1: Identify Your Nutone Doorbell Model

Not all Nutone doorbells are the same. The first step in changing your chime is identifying the exact model you have. This ensures you buy the correct replacement and follow the right wiring instructions.

Where to Find the Model Number

The model number is usually printed on a label inside the chime cover or on the back of the unit. To access it:

• Remove the front cover of the chime box (usually held by two screws).
• Look for a sticker or engraved text with a model like “LA170,” “LA200,” “LA300,” or “LA400.”
• If the label is faded, check the user manual or search online using the serial number.

Common Nutone chime models include:

• LA170: Classic two-note mechanical chime.
• LA200: Similar to LA170 but with a slightly different housing.
• LA300: Electronic chime with multiple tones.
• LA400: Advanced electronic model with volume control and melody options.

Knowing your model helps you determine whether you’re replacing a mechanical chime (which uses electromagnets and hammers) or an electronic one (which uses a circuit board and speaker). Mechanical chimes are simpler to replace, while electronic models may require more attention to wiring polarity.

Check Compatibility

When buying a replacement, ensure it’s compatible with your existing transformer and doorbell button. Most Nutone chimes work with standard 16-volt transformers, but double-check the specs. If you’re upgrading to a different type (e.g., from mechanical to electronic), verify that your wiring can support it.

Tip: Take a photo of your current chime and wiring setup before shopping. This helps when comparing models at the hardware store or online.

Step 2: Turn Off the Power

Safety is the most important part of this project. Doorbell systems are low voltage, but they’re still connected to your home’s electrical circuit. Never work on the chime while the power is on.

Locate the Circuit Breaker

Find the breaker that controls your doorbell. It’s often labeled “Doorbell,” “Chime,” or “Front Door.” If it’s not labeled:

• Turn off breakers one by one and test the doorbell after each.
• When the chime stops working, you’ve found the right breaker.

Turn Off and Verify

Switch the breaker to the “OFF” position. Then, use a non-contact voltage tester to check the chime terminals. Place the tester near the wire connections—if it beeps or lights up, the power is still on. Double-check the breaker panel and test again.

Never skip this step. Even low-voltage systems can cause shocks or damage components if mishandled.

Step 3: Remove the Old Chime Unit

With the power off, you can safely remove the old chime.

Take Reference Photos

Before disconnecting anything, take clear photos of the wiring. Note which wire goes to which terminal (usually labeled “Front,” “Trans,” and “Rear”). This will help when installing the new unit.

Disconnect the Wires

Use a screwdriver to loosen the terminal screws. Gently pull the wires free. If the wires are stiff, wiggle them slightly while pulling. Avoid yanking, as this can damage the wires or wall.

Tip: Use a piece of tape to label each wire (e.g., “Front,” “Rear”) if the labels aren’t clear.

Remove the Mounting Screws

Unscrew the chime unit from the wall or electrical box. Most Nutone chimes are mounted with two screws at the top and bottom. Carefully lower the unit and set it aside.

If the unit is stuck due to paint or age, gently wiggle it free. Avoid forcing it, as this could damage the wall.

Step 4: Prepare the New Chime

Now it’s time to get your new chime ready for installation.

Unbox and Inspect

Remove the new chime from its packaging. Check for any damage during shipping. Read the included instructions—some models have specific wiring requirements.

Compare Terminals

Look at the terminal layout on the new chime. Most Nutone models have three terminals:

• Front: Connects to the front doorbell button.
• Rear: Connects to the rear or second doorbell button (if you have one).
• Trans: Connects to the transformer (power source).

If your old chime had only two wires, you likely don’t have a rear button. In that case, leave the “Rear” terminal empty.

Strip Wires if Needed

If the wire ends are frayed or too short, use wire strippers to expose about 1/4 inch of copper. This ensures a solid connection.

Tip: Twist the exposed wire strands tightly to prevent them from fraying when inserted into the terminal.

Step 5: Install the New Chime

Now for the main event—wiring and mounting the new chime.

Connect the Wires

Match the wires to the correct terminals based on your reference photos or labels:

• Attach the wire from the front doorbell to the “Front” terminal.
• Attach the wire from the transformer to the “Trans” terminal.
• If you have a rear doorbell, connect it to the “Rear” terminal.

Tighten the terminal screws securely. The wires should be held firmly without being crushed.

Important: Do not cross the wires. Reversing “Front” and “Trans” can damage the chime or cause it to malfunction.

Mount the Chime

Position the new chime against the wall or electrical box. Align the mounting holes and insert the screws. Tighten them just enough to hold the unit securely—don’t overtighten, as this can crack the plastic housing.

Secure Loose Wires

If wires are dangling, use zip ties or electrical tape to bundle them neatly behind the chime. This prevents strain on the terminals and keeps the installation tidy.

Step 6: Restore Power and Test

You’re almost done! Now it’s time to see if everything works.

Turn the Power Back On

Go to the breaker panel and switch the doorbell circuit back to “ON.”

Test the Doorbell

Press the front doorbell button. Listen for the chime. If it works, great! If not, don’t panic—we’ll troubleshoot below.

If you have a rear doorbell, test that too. Both should produce the expected sound.

Adjust Settings (If Applicable)

Some electronic chimes have volume controls or tone selectors. Use the dials or buttons on the unit to customize the sound. Refer to the manual for specific instructions.

Troubleshooting Common Issues

Even with careful installation, problems can occur. Here’s how to fix the most common issues.

No Sound at All

• Check power: Use the voltage tester to confirm the transformer is sending power to the “Trans” terminal.
• Verify wiring: Double-check that wires are connected to the correct terminals and not loose.
• Test the button: Press the doorbell button firmly. If it feels loose, it may be faulty.
• Inspect the transformer: A failed transformer won’t power the chime. Consider replacing it if other fixes don’t work.

Weak or Distorted Sound

• Loose connections: Tighten terminal screws.
• Low voltage: Ensure the transformer outputs 16 volts. Use a multimeter to test.
• Old wires: Corroded or damaged wires can reduce signal strength. Replace if necessary.

Chime Rings Randomly

• Faulty button: A stuck or shorted doorbell button can trigger false rings. Replace the button.
• Loose wiring: Check for frayed wires touching each other or the wall.
• Interference: Nearby electronics can sometimes interfere with wireless or electronic chimes. Relocate the chime if possible.

Only One Note Plays (Mechanical Chimes)

• Stuck hammer: Gently tap the chime to free a stuck mechanism.
• Worn components: Mechanical chimes have moving parts that wear out. Replacement may be the best fix.

Upgrading to a Modern Chime

If you’re replacing an old mechanical chime, consider upgrading to a modern electronic model. Nutone offers several options with features like:

• Multiple melodies: Choose from classical tunes, nature sounds, or holiday themes.
• Volume control: Adjust the loudness for different times of day.
• LED indicators: Some models light up when the doorbell is pressed.
• Wireless options: No rewiring needed—just sync with your existing button.

Electronic chimes are quieter on the inside (no clanging hammers) and often more reliable. They’re also easier to customize. Just make sure your wiring supports the new unit—most do, but check the specs.

Safety Tips and Best Practices

Even simple projects require caution. Follow these tips to stay safe and ensure a successful installation.

• Always turn off power: Never assume the breaker is off—test it.
• Work in good lighting: Use a flashlight if needed to see terminals clearly.
• Don’t rush: Take your time to avoid mistakes.
• Keep kids and pets away: Electrical work can be dangerous if unsupervised.
• Dispose of old units properly: Recycle or donate if functional; otherwise, trash responsibly.

When to Call a Professional

Most homeowners can handle this project, but some situations call for an electrician:

• You’re unsure about wiring or electrical safety.
• The chime is hardwired into a complex system (e.g., intercom or security).
• You discover damaged wiring or a faulty transformer.
• You want to install a completely new doorbell system with video or smart features.

A licensed electrician can ensure everything is up to code and working safely. It’s a small cost for peace of mind.

Conclusion: Enjoy Your New Doorbell Sound

Changing the chime on your Nutone doorbell is a quick and rewarding upgrade. With the right tools, a little patience, and attention to safety, you can replace a broken chime or modernize your home’s entrance in under an hour. From identifying your model to testing the final installation, each step brings you closer to a doorbell that’s both functional and enjoyable.

Remember: always turn off the power, label your wires, and test before reassembling. If something doesn’t work, refer to the troubleshooting section or consult a professional. With your new chime in place, you’ll greet every guest with a clear, pleasant sound—no more missed deliveries or silent doorbells.

Now that you know how to change chime on a Nutone doorbell, you’re ready to tackle this project with confidence. Happy DIYing!