Replacing Your KitchenAid Water Filter 4 Takes About Five Minutes

The KitchenAid Water Filter 4 is a replacement cartridge that fits inside the water dispensers on certain KitchenAid refrigerators. You remove the old filter by twisting it counterclockwise, then screw the new one in clockwise until it stops. The whole job takes less than five minutes and requires no tools. Most people do this once every six months, though the timing depends on your water quality and how much water you dispense.

The filter sits inside the refrigerator door or on the back wall, depending on your model. Before you start, turn off the water supply to the fridge or locate the water shut-off valve inside the fridge itself — some models have a small lever you flip. This prevents water from spraying when you remove the old filter.

Key Takeaways

  • Turn off the water supply before removing the old filter to avoid water spilling inside the refrigerator.
  • Twist the old filter counterclockwise by hand until it comes free, then discard it.
  • Wet the rubber gasket on the new filter with clean water before installing it to may support a tight seal.
  • Screw the new filter clockwise until it stops, then run water through the dispenser for 30 seconds to flush air from the line.
  • The filter location varies by model — check your refrigerator's manual or the inside of the door for the exact position.

Locate the Filter and Turn Off Water

Open your refrigerator and look for the water filter. On most KitchenAid models, it sits in a housing on the inside of the door, usually in the upper corner. On some models, it is mounted on the back wall near the top. Your refrigerator's manual will show the exact location, or you can look for a cylindrical cartridge about the size of a soda can.

Once you find it, locate the water shut-off. Many KitchenAid refrigerators have a small lever or button inside the fridge near the filter housing. Flip or press it to stop the water flow. If you cannot find an internal shut-off, turn off the main water supply to the refrigerator from behind the unit or under the sink, depending on how your fridge is plumbed.

Remove the Old Filter

Grip the filter cartridge with your hand and turn it counterclockwise. It will loosen after a quarter turn or so. Keep turning until the filter comes free — you may feel a small amount of water drip out, which is normal. Have a towel or small bowl ready to catch any remaining water in the housing.

Once the old filter is out, look inside the housing. You will see a rubber gasket (a small ring) at the base. Wipe away any debris or mineral buildup with a clean, damp cloth. This ensures the new filter will seal properly and prevents leaks.

Install the New Filter 4

Before you screw in the new filter, wet the rubber gasket on the bottom of the cartridge with clean water from your tap. This helps create a watertight seal. Do not use tap water from the dispenser itself — use water from your sink.

Align the new filter with the housing and push it in gently. Then turn it clockwise by hand until it stops. You should feel resistance when it is fully seated, but do not force it — hand-tight is correct. Over-tightening can damage the gasket and cause leaks later.

Flush the Line and Restore Water

Turn the water supply back on by flipping the internal lever or opening the main shut-off valve. You may hear air hissing through the dispenser — this is normal. Press the water dispenser button and let water run for about 30 seconds. This flushes air from the line and removes any loose carbon particles from the new filter.

The water may look slightly cloudy or taste a bit like carbon for the first few gallons. This is harmless and will clear within a few uses. After 30 seconds of running water, your filter is ready to use.

When to Replace Your Filter 4

KitchenAid recommends replacing the Water Filter 4 every six months under normal use. If you have hard water or use the dispenser heavily, you may need to replace it more often — every three to four months. If you use very little water, you can stretch it to nine months, but six months is the standard interval.

Some KitchenAid models have a filter indicator light on the refrigerator display. When it turns on or changes color, that is your signal to replace the filter. If your model does not have an indicator, set a reminder on your phone or calendar for six months after installation.

Troubleshooting Common Issues

If water leaks from the filter housing after installation, the gasket may not be seated properly. Turn off the water, remove the filter, and check that the rubber ring is clean and not cracked. Wet it again with clean water and reinstall the filter, making sure it is hand-tight but not forced.

If water pressure from the dispenser drops noticeably after a filter change, the new filter may be installed backward or the old filter was so clogged that the new one feels restrictive by comparison. This is usually temporary — run water for a full minute to flush the line completely. If pressure remains low after that, remove and reinstall the filter to confirm it is seated correctly.

If you cannot find the Water Filter 4 in your refrigerator, check your model number in the manual or on the back of the unit. Some KitchenAid models use different filter types — Filter 1, Filter 2, or Filter 3 — and they are not interchangeable. Installing the wrong filter will not fit properly and may damage the housing.

Frequently Asked Questions

Where do I buy a replacement KitchenAid Water Filter 4?

You can buy Filter 4 cartridges from appliance retailers like Best Buy and Lowe's, online marketplaces like Amazon, and directly from KitchenAid's website. Prices typically range from $30 to $50 per filter. Compare prices across retailers before buying, as they vary. Make sure the listing says "Filter 4" and matches your refrigerator model number.

Can I use a generic water filter instead of the KitchenAid brand?

Some third-party filters are designed to fit the KitchenAid Filter 4 housing and cost less than the official cartridge. They work mechanically, but KitchenAid does not test or warrant them. If you choose a generic filter, verify it is rated for your water type and check reviews from other users with your refrigerator model before buying.

What happens if I forget to turn off the water before removing the filter?

Water will spray out of the housing and into the refrigerator. It is not dangerous, but it will wet the shelves and food. If this happens, turn off the water when ready, wipe up the spill, and let the fridge dry for a few minutes before reinstalling the filter. Check that no water pooled in the bottom of the fridge or dripped onto the compressor underneath.

Do I need to reset anything after installing a new filter?

If your refrigerator has a filter indicator light, you may need to reset it after installation. The method varies by model — some have a reset button near the filter housing, others require you to hold a button on the display panel for a few seconds. Check your manual for the exact steps. If you do not reset it, the light will stay on even though the filter is new.

How long does a KitchenAid Water Filter 4 actually last?

The six-month recommendation assumes average use and typical municipal water quality. If your water is very hard or contains high sediment, the filter will clog faster and may need replacement every three months. If you rarely use the dispenser, it can last nine months. The filter does not expire, but its ability to remove contaminants declines over time, so the six-month interval is a practical guideline rather than a hard rule.