Replacing an over-the-range microwave charcoal filter never goes deeper than the vent grille: take the grille off the top front, slide the old filter out, and slide in a new one made for your model. Swap it when cooking odors linger even with the fan on, and on the schedule in your manual, which for many models is about every six months.
Time: about 15 minutes · Difficulty: Easy · You'll need: the correct charcoal filter for your model, a screwdriver (for some grilles), a step stool, dish soap and a soft brush for the grease filters
Before you start
- •Turn the microwave and its fan off. If the plug is easy to reach in the cabinet above, unplug it.
- •Only remove the vent grille and filters. Never remove the microwave's outer cabinet or panels; the inside can hold dangerous stored electricity even when unplugged.
- •Use a sturdy step stool, not a chair.
- •Know your setup: charcoal filters are used when the microwave recirculates air back into the kitchen. If yours vents outdoors, your manual may say a charcoal filter isn't needed.
Steps
Step 1 — Find your model number
Look for the label inside the microwave door frame or on the inside wall, then match the replacement filter to it.
Step 2 — Remove the vent grille
On many models the grille at the top front is held by a few screws along the top edge; on others it releases with tabs. Lower or pull it toward you gently.
Step 3 — Slide out the old filter
The charcoal filter usually sits right behind the grille. Slide it out and note which way it faced.
Step 4 — Install the new filter
Slide the new filter in the same orientation, making sure it sits flat in its slot.
Step 5 — Refit the grille
Line the grille up, press it into place, and replace any screws snugly without overtightening.
Step 6 — Clean the grease filters
Underneath the microwave, slide or pop out the metal mesh grease filters. Soak them in hot soapy water, brush gently, rinse and let them dry fully before reinstalling. Some manuals allow the dishwasher.
Step 7 — Test the fan
Restore power and run the vent fan on each speed to make sure it sounds normal.
Didn't fix it?
If odors still linger with fresh filters, the microwave's blower may have been set up for outdoor venting when the installation actually recirculates, or the reverse, which a technician can confirm. A fan that doesn't run, runs only on one speed, or makes grinding noises needs a technician. Problems with heating, sparking or the door are never DIY, so book microwave repair. The microwave sits right above the cooktop, so keeping the cooktop clean helps too; see how to clean a glass cooktop.
How often to do this
Replace the charcoal filter about every six months, or as your manual says; charcoal filters generally can't be washed. Clean the grease filters about once a month if you cook often.
From Kevin: Charcoal filters get forgotten because they're hidden behind the grille. If you've never changed yours, it's almost certainly overdue.
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