DIY Guide: How to Install an Over-the-Range Microwave Like a Pro

Replacing or installing a new over-the-range (OTR) microwave can significantly enhance your kitchen’s functionality and aesthetics. While it might seem like a daunting task, with the right tools, careful planning, and a step-by-step approach, you can confidently install an OTR microwave yourself, saving money on professional installation costs. This comprehensive guide will walk you through the entire process, from initial preparation to the final touches, ensuring a safe and successful installation.

Before You Begin: Essential Preparation

Before you even think about lifting that new microwave, there are some critical steps you need to take to ensure a smooth installation. These steps will not only make the process easier but also help prevent potential mistakes or injuries.

1. Safety First: Electrical Considerations

• Turn Off the Power: Locate the circuit breaker that controls the electrical outlet where the microwave will be plugged in and turn it OFF. Verify the power is off by testing the outlet with a non-contact voltage tester. This step is non-negotiable for your safety.
• Inspect the Outlet: Ensure that the outlet is a grounded, three-prong outlet. OTR microwaves require this type of connection for safe operation. If your outlet is not a three-prong outlet or is damaged, you may need to consult an electrician before proceeding.
• Know Your Circuit: Over-the-range microwaves generally need a dedicated 15- or 20-amp circuit. If you are unsure about your home’s electrical system, it’s best to consult with a qualified electrician to ensure that the circuit is sufficient and safe.

2. Gather Your Tools and Materials

Having all your tools and materials at hand will make the installation much smoother. Here’s a comprehensive list:

• New Over-the-Range Microwave: Make sure it’s the correct size and model for your space. Double-check its specifications before starting installation.
• Mounting Hardware: Your new microwave should come with mounting hardware like a top template, mounting brackets, screws, and possibly bolts or nuts. Ensure you have all pieces and read your product’s manual to familiarize yourself with it.
• Screwdrivers: A Phillips head screwdriver and a flathead screwdriver in various sizes are essential. Consider a multi-bit screwdriver for added versatility.
• Drill: A power drill with various drill bits, including bits for wood and drywall/plaster. You’ll also need a drill bit that’s the correct size for drilling pilot holes for your mounting screws (usually around 1/8th inch to 3/16th inch)
• Stud Finder: To locate the studs in your wall. This is crucial for secure mounting.
• Level: A bubble level or laser level to ensure the microwave is mounted straight and level.
• Pencil: For marking the wall, drilling points, and the template location.
• Measuring Tape: For accurate measurements of your cabinet and microwave opening.
• Safety Glasses: Protect your eyes from dust and debris.
• Work Gloves: Protect your hands while handling tools and hardware.
• Step Ladder or Stool: For reaching the area above the stove and cabinets.
• Duct Tape or Painter’s Tape: For temporarily securing the top template.
• Optional – Reciprocating Saw or Jig Saw: Only if you need to cut through an existing cabinet bottom or vent.
• Optional – Multimeter: If you’re comfortable using a multimeter, you can use one to double-check the outlet is truly deenergized

3. Measure and Plan Your Installation

• Cabinet Dimensions: Measure the width, height, and depth of your cabinet opening where the microwave will be installed. Compare these dimensions with the microwave’s specifications to ensure a proper fit.
• Existing Venting: Note whether you have an existing duct or if the microwave will be recirculating. If you have existing ductwork, you may need to purchase or modify connecting parts.
• Outlet Location: Identify the location of the electrical outlet relative to where the microwave will be mounted. Some microwaves have specific power cord entry locations.
• Clear the Area: Remove any items from the countertop below the installation area, as well as from inside the cabinets you will be using for reference.

Step-by-Step Installation Guide

Now that you are well-prepared, let’s proceed with the actual installation. Remember, take your time, and don’t rush any of the steps.

Step 1: Prepare the Mounting Area

1. Locate Wall Studs: Use the stud finder to locate the studs in the wall behind the mounting area. Mark their locations with a pencil. These will be the most important points to mount the microwave securely.
2. Position the Template: Most OTR microwaves come with a cardboard template. Align the template with the bottom of the cabinets (or the space where the bottom of the cabinet would be if you don’t have a bottom cabinet) and ensure it’s centered in the space. Use the level to confirm it is positioned correctly and securely tape it to the wall using tape. The location of studs should be marked on the template and correspond to your stud marks on the wall.
3. Mark Pilot Hole Locations: Using the template, mark the locations on the wall where you will need to drill pilot holes for the mounting screws. These are usually indicated on the template.

Step 2: Install the Mounting Bracket

1. Drill Pilot Holes: Using your drill and appropriate drill bit, drill pilot holes at the marked locations. Make sure to drill straight.
2. Attach the Mounting Bracket: Position the mounting bracket against the wall, aligning it with the pilot holes. If you located a wall stud, ensure that at least one of your screws is going into a stud. Use the screws to secure the mounting bracket to the wall. Don’t tighten them completely, leave just a little play for adjustments before final install.
3. Double-Check Level: Use your level to ensure the mounting bracket is perfectly level before completely tightening all screws. Once the bracket is level, fully tighten all screws.

Step 3: Prepare the Microwave

1. Remove Packaging: Carefully remove all packaging materials from the microwave. Be careful with the glass turntable.
2. Remove the Internal Turntable Components: Usually, this consists of the glass turntable, the plastic hub that rotates the turntable and a support ring. Remove all of these and store them safely, as they should be installed after the microwave is installed.
3. Prepare the Venting (If Necessary): If your microwave will be venting to the outside, you will need to adjust the vent damper on the back of the microwave to the correct position to correspond with your vent configuration. The included manual of the microwave will explain in more detail on how to perform this action.

Step 4: Mount the Microwave

1. Lift and Align: With the help of another person, carefully lift the microwave and align it with the mounting bracket on the wall. Be sure to route the power cord such that it won’t be pinched between the microwave and the wall.
2. Secure the Microwave: Slide the microwave into place, following the manufacturer’s instructions. It will most likely slide into hooks or slots on the mounting bracket. You may need to lift and tilt the front lip into the top hooks first, then push the microwave back and down into the bottom support.
3. Secure with Screws: Once the microwave is properly positioned, secure it to the mounting bracket with the screws provided. Make sure to screw in any screws located at the top of the microwave inside the cabinet as these screws are the most important to ensure a tight fit and prevent damage from the appliance falling.

Step 5: Connect the Electrical Outlet

1. Plug in the Microwave: Plug the microwave’s power cord into the electrical outlet. Ensure the power cord is clear of any moving parts or sharp edges.
2. Test the Power: Turn the power back on at the circuit breaker and verify that the microwave powers on.

Step 6: Install Remaining Parts

1. Install the Glass Turntable: Place the plastic rotating hub in the center of the microwave, then the support ring and finally, the glass turntable.
2. Install Remaining Parts: Install any remaining parts as indicated in your product’s manual.

Step 7: Final Checks and Cleanup

1. Test Operation: Test all functions of the microwave, such as heating, lighting, and the ventilation fan.
2. Clean Up: Remove all tools and materials. Discard any packaging and debris and clean up the work area.
3. Read the Manual Again: Go through your microwave’s user manual once more, looking for any specific operational instructions or things you might have missed.

Troubleshooting Tips

Even with the most careful planning, you might encounter some issues during installation. Here are some common problems and their solutions:

• Microwave Isn’t Level: Double-check the mounting bracket and the microwave itself to ensure they are level. You may need to use shims to level it properly.
• Microwave Doesn’t Power On: Ensure the outlet is working with a different device, and that the microwave’s cord is securely plugged in. If it still doesn’t power on, check your home’s circuit breaker to see if it was tripped.
• Screws Are Stripping: If screws are stripping, use a larger bit size or try using a manual screwdriver. Be sure to use the correct size screwdriver for the screw type to avoid stripping.
• Template Does Not Match: Double check that you are using the correct template and verify it matches the model of the microwave you are installing.

Final Thoughts

Installing an over-the-range microwave yourself can be a rewarding DIY project. By following these detailed steps, taking your time, and prioritizing safety, you can successfully install your new microwave and enjoy its benefits. Remember, if you ever feel uncomfortable or unsure about any part of the process, it’s always a good idea to consult with a qualified professional.

With your new OTR microwave in place, you’re ready to enjoy a more functional and modern kitchen. Happy cooking!