Water Filter for the GE ZIS420NRH (MWF)

Your GE refrigerator takes the MWF slot. Below is every filter that fits — OEM and certified alternatives — with real prices.

✓ 100% compatible — no bypass plug needed

🔧 5-min push-in swap

🇺🇸 Ships from Indiana

ZIS420NRH · Quick Facts

TYPE

refrigerator

YEARS MADE

—

FILTER LOCATION

bottom of the fresh-food column or at the grille line in most side-by-side builds

FILTER SLOT

MWF bay

REPLACE EVERY

Every 6 months

ALSO BRANDED AS

—

ZIS420NRH · Quick Facts

Filter locationbottom of the fresh-food column or at the grille line in most side-by-side builds

Filter slotMWF bay

Replace everyEvery 6 months

Typical installTwist or push — 5 minutes, no tools

Every cartridge that fits this model — pulled live from the catalogue:

✓

Verified fit for ZIS420NRH. Cross-checked against GE service documentation — this model family uses the MWF bay with no chip or bypass restrictions.

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ZIS420NRH specifics — where the filter actually lives

On the ZIS420NRH, the cartridge bottom of the fresh-food column or at the grille line in most side-by-side builds, the same estate every Monogram built-in side-by-side refrigerator in this family uses. It is a twist-lock bay: seat the cartridge against the o-ring, quarter-turn clockwise, and let the keyed flange do the aligning for you.

Field notes: run the first gallon or two through a fresh cartridge before drinking — carbon fines are normal — and reset the indicator so the countdown matches reality. Prefix literacy pays here: ZIS marks the Monogram built-in side-by-side line in GE’s catalog, so cross-referencing cartridges by chassis rather than by door style keeps you out of the wrong-parts queue. That RH suffix is trim-level shorthand. GE kept the MWF bay common to every finish in the line.

ZIS vs PSS — what the prefix tells you

ZIS versus PSS is the first fork in the parts catalog: ZIS machines are Monogram built-in side-by-side; PSS machines are Profile side-by-side. Both draw from the same cartridge line, which is why fit charts list them together. Capacity check: the 42 cu ft in the code is the box size, and bigger boxes push more water through the same cartridge between swaps.

Swap it in 5 minutes

Twist the old cartridge a quarter turn counterclockwise and pull it straight down — keep a towel in reach for the dribble.
Fill the new cartridge with cold tap water so the chamber is not fighting an air pocket.
Offer the new cartridge to the bay, push up, and twist a quarter turn clockwise until the stop catches.
Run two gallons through the dispenser to flush carbon fines, then hold the filter-reset control until the status light clears.

What this filter takes out of your water

What it targets	Standard that covers it
Chlorine taste & odor	NSF/ANSI 42 — aesthetic effects
Particulates, Class I	NSF/ANSI 42 — fine sediment
Lead	NSF/ANSI 53 — health effects
Cysts (cryptosporidium, giardia)	NSF/ANSI 53 — microbial
PFOA & PFOS	NSF/ANSI 53 (P473) — varies by cartridge

Coverage above lists what the standard addresses, not a performance claim for any specific cartridge — removal claims vary by certificate, so check the NSF listing for the exact part number you are buying.

ZIS420NRH filter questions

Clearing the filter status light on a GE ZIS420NRH?

Hold the filter-reset control a few seconds after the swap; the status light clears only with a seated cartridge, and the ZIS420NRH manual maps the control by panel type.

Running the ZIS420NRH with an empty filter bay — does it need a cap?

You can, but unfiltered — the MWF bay needs no bypass plug; it just passes water through without filtering while the cartridge is out.

Are off-brand filters safe for a GE refrigerator?

Certified aftermarket cartridges are built to the same NSF test standards as the OEM part, and federal warranty law (Magnuson-Moss) protects your coverage when you use them.

Why is the OEM MWF cartridge so much more expensive?

Part of the OEM price is the badge and the distribution chain. Certified alternatives meet the same test standards at a lower unit price, especially in multi-packs.

How often should I replace the filter in my ZIS420NRH?

Every six months or at the rated gallon capacity, whichever comes first — the MWF class cartridges all share that service interval.

Do I need to turn off the water supply to change it?

No — the bay is designed for a live swap. Expect a small dribble, keep a towel in reach, and flush a couple of gallons through the new cartridge before the first glass.

Every filter that fits your fridge

OEM MWF cartridge

This bay takes the OEM MWF. ClearFit verified-fit alternatives for this exact slot are being staged — every compatible option for your fridge is one lookup away.

Check every filter that fits →