How to Install the Grease Filter on Whirlpool Microwave WMH31017HZ — Step-by-Step

⚠️ Safety Warnings

Before starting any maintenance on your Whirlpool WMH31017HZ microwave, make sure the unit is unplugged or the circuit breaker is turned off. Allow the microwave to cool completely if it has been running. Grease filters can have sharp edges, so be cautious to avoid cuts. Never operate the microwave without properly installed grease filters, as this can damage internal components and create a fire hazard.

Understanding Your Whirlpool WMH31017HZ Grease Filter System

The Whirlpool WMH31017HZ over-the-range microwave comes equipped with a dual grease filter system, located on the underside of the unit right behind the ventilation grilles. These aluminum mesh filters are essential for capturing grease, smoke, and other cooking particles while the exhaust fan operates, thus protecting the internal components and enhancing air quality in your kitchen.

Your WMH31017HZ features two identical rectangular grease filters, each measuring approximately 5″ x 7.5″ x 0.375″. These filters slide into designated slots and are secured by a spring-loaded tab mechanism that prevents them from accidentally falling out during operation.

Locating the Grease Filters on Your WMH31017HZ

The grease filters on your Whirlpool WMH31017HZ are positioned on the bottom panel, directly above your cooktop. Look for two rectangular openings covered by aluminum mesh screens. You can find these filters:

• Behind the bottom ventilation grille
• About 3 inches from the front edge of the microwave
• Centered left and right across the width of the unit
• Accessible without needing to remove any screws or panels

Identifying the Correct Replacement Filter

The Whirlpool WMH31017HZ uses part number W10208631A for its replacement grease filters. These are typically sold individually, so you’ll need to order two filters for a complete replacement. Alternative compatible part numbers include:

• W10208631A (Primary part number)
• AP6014867 (Alternative part number)
• 1938304 (Cross-reference number)
• PS11749245 (Service part number)

Removing the Old Grease Filters

The WMH31017HZ features a convenient push-tab release mechanism that makes filter removal a breeze:

1. Stand directly under the microwave and locate the first grease filter on the left side
2. Find a small metal tab on the front edge of the filter, about 1 inch from the right corner
3. Press the tab firmly toward the back of the microwave while pulling the front of the filter downward
4. Once the front edge is clear of the retention slot, slide the filter forward about 2 inches
5. Tilt the front of the filter down and pull it completely out of the housing
6. Repeat this process for the second filter on the right side

If the filters feel stuck, they may be warped from heat or clogged with grease. Gently wiggle the filter while applying pressure to the release tab. Avoid forcing the filters, as this could damage the retention mechanism.

Step-by-Step Installation of New Grease Filters

Installing new grease filters in your Whirlpool WMH31017HZ requires careful alignment and proper engagement of the retention tabs:

1. Remove the new filters from the packaging and inspect them for any shipping damage
2. Orient the filter so the release tab faces forward and is positioned on the right side (for the left filter slot) or left side (for the right filter slot)
3. Hold the filter at a 45-degree angle with the rear edge elevated higher than the front
4. Insert the rear edge of the filter into the back slot of the filter housing, pushing it as far back as it will go
5. While maintaining pressure toward the back, slowly lower the front edge of the filter
6. Push the front edge upward until you hear the release tab click into place
7. Gently tug on the front of the filter to ensure it’s securely locked
8. Repeat the installation process for the second filter

Both filters should sit flush with the bottom of the microwave housing. If a filter looks crooked or is lower than the other, remove and reinstall it following the steps above.

Cleaning Aluminum Grease Filters Instead of Replacing

The aluminum grease filters in your WMH31017HZ can be cleaned and reused multiple times before needing replacement. Here are two effective cleaning methods:

Dishwasher Method

1. Remove filters following the removal steps outlined above
2. Place filters on the bottom rack of your dishwasher
3. Use regular dishwasher detergent and run a normal cycle
4. Allow filters to air dry completely before reinstalling
5. Inspect for any remaining grease buildup and repeat if necessary

Boiling Water and Baking Soda Method

1. Fill a large pot with enough water to submerge one filter completely
2. Add 1/4 cup of baking soda per quart of water
3. Bring the solution to a rolling boil
4. Carefully submerge the filter using tongs
5. Boil for 10-15 minutes, allowing the alkaline solution to dissolve grease
6. Remove the filter and scrub gently with a soft brush
7. Rinse thoroughly with hot water and allow to air dry completely
8. Repeat for the second filter

Maintenance Schedule and Filter Lifespan

The frequency of grease filter maintenance for your WMH31017HZ depends on your cooking habits and the types of food you prepare:

• Heavy cooking (daily frying, grilling): Clean every 1-2 months
• Moderate cooking (3-4 times per week): Clean every 3-4 months
• Light cooking (occasional use): Clean every 6 months
• Replace filters when aluminum mesh becomes damaged or cleaning no longer removes grease effectively

Watch for signs that indicate your filters need immediate attention: visible grease dripping, reduced exhaust fan efficiency, lingering cooking odors, and greasy film on nearby surfaces.

Charcoal Filter Replacement for Recirculating Mode

If your Whirlpool WMH31017HZ operates in recirculating mode (not vented to the outside), it also contains a charcoal odor filter that needs periodic replacement. This filter is located behind the grease filters and can be accessed after removing both grease filters:

1. Remove both grease filters following the steps above
2. Look for a rectangular charcoal filter mounted horizontally behind the grease filter area
3. The charcoal filter uses part number W10311524 for the WMH31017HZ
4. Press the retention tabs on both sides of the charcoal filter
5. Slide the old charcoal filter forward and down to remove it
6. Insert the new charcoal filter by reversing the removal process
7. Replace charcoal filters every 6-12 months or when cooking odors are no longer filtered effectively

Troubleshooting Common Installation Issues

If you run into trouble during grease filter installation on your WMH31017HZ, these solutions can help with common issues:

• Filter won’t slide in completely: Check for grease buildup in the track slots and clean with a degreasing solution
• Release tab won’t engage: Ensure the filter is pushed all the way back before lowering the front edge
• Filter appears crooked: Remove and verify you’re inserting the rear edge fully into the back slot
• Rattling noise during operation: Check that both filters are properly locked in place and not loose

Frequently Asked Questions

How often should I replace the grease filters on my Whirlpool WMH31017HZ?

Grease filters should be cleaned every 1-6 months depending on usage and replaced only when the aluminum mesh becomes damaged or cleaning no longer effectively removes grease buildup. With proper maintenance, quality aluminum filters can last 2-3 years.

Can I run my WMH31017HZ without grease filters installed?

No, never operate the microwave without grease filters. The filters protect internal components from grease and debris. Operating without filters can damage the fan motor, create fire hazards, and void your warranty.

Are aftermarket grease filters compatible with the WMH31017HZ?

While some aftermarket filters may fit, Whirlpool recommends using genuine part number W10208631A for optimal performance and proper fit. Generic filters may not align correctly with the retention tabs or provide adequate filtration.

Why do my grease filters keep falling out of my WMH31017HZ?

Filters that fall out are usually not properly engaged with the retention tabs. Ensure you’re pushing the filter all the way back before lowering the front edge, and listen for the click that indicates proper engagement. Warped filters from excessive heat may also not lock properly and should be replaced.

What’s the difference between grease filters and charcoal filters?

Grease filters are aluminum mesh screens that capture grease and particles, while charcoal filters remove odors. The WMH31017HZ uses both types — grease filters are always required, while charcoal filters are only needed when operating in recirculating mode.

Can I clean grease filters with oven cleaner?

Avoid harsh chemicals like oven cleaner on aluminum grease filters as they can damage the mesh and finish. Stick to dishwasher cleaning or the baking soda method for safe, effective results that won’t harm the filter material.

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When to Call a Professional

Most of the repairs detailed in this guide are well within the reach of a careful DIYer with basic tools. In my experience, if you’re replacing the grease filter and notice heavy grease buildup around the cavity that has migrated toward the vent ducting or the charcoal filter housing, or if the fan is making a grinding or high-pitched whine that doesn’t stop after a clean filter is installed, that’s your cue to call a certified technician — sometimes a simple filter job can mask a failing fan motor or a grease-contaminated blower wheel that requires partial disassembly to fix safely. If you’re ever in doubt, a diagnostic service call typically costs between $80–$120 and can save you from a misdiagnosis that ends up costing more in parts.

Recommended Parts & Tools

Whirlpool WMH31017HZ Grease Filter Replacement

This is the exact OEM grease filter designed specifically for the Whirlpool WMH31017HZ microwave model. Having a replacement filter on hand ensures you can maintain proper ventilation and grease filtration in your microwave. Check current pricing on Amazon.

Easy-Off Heavy Duty Degreaser

Before installing a new grease filter, it’s important to clean the filter housing and surrounding areas of built-up grease and debris. This heavy-duty degreaser effectively removes stubborn grease accumulation that can affect filter performance and microwave operation. Check current pricing on Amazon.

Klein Tools 32500 11-in-1 Screwdriver/Nut Driver Set

Some grease filter installations may require removing screws or clips to access the filter compartment properly. This multi-bit screwdriver provides all the common bit types needed for appliance work in one convenient tool. Check current pricing on Amazon.

The OEM Filter That Actually Seats Flush — Why Aftermarket Won’t Cut It Here

In my experience, most of the complaints about rattling and reduced airflow on this model stem from a filter that’s warped, worn out, or simply a cheap knockoff that doesn’t fit right. Using the genuine Whirlpool part takes away that guessing game and ensures those tabs seat exactly where they’re supposed to.

What works

• The tab alignment is precise — no forcing, no wiggling, and no rattling after you slide it in. The frame and filter are designed together, not retrofitted.
• The mesh density and frame rigidity hold up through repeated cleaning cycles without warping or sagging, which keeps airflow consistent and prevents rattling at the back.
• Whirlpool’s specifications match this exact microwave’s cavity depth and width, so you won’t encounter any installation surprises or filters that bind halfway in.

What doesn’t

• Genuine OEM filters cost more upfront than universal or third-party options, but you won’t find yourself replacing it twice because the cheap one warped after just a few washes.
• Not all online sellers stock the correct part code — I’ve had customers order something labeled “compatible” only to receive a filter for a completely different Whirlpool model.

I learned this lesson the hard way years ago when a homeowner bought a “universal fit” filter online and spent an hour trying to jam it in before calling me back. The OEM part slid in place in ten seconds. Order the Whirlpool WMH31017HZ Grease Filter Replacement directly, and you’ll skip that frustration entirely.

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