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Water Filter for the Monogram ZISS420NRGSS (MWF)
✓ 100% compatible — no bypass plug needed
🔧 5-min push-in swap
🇺🇸 Ships from Indiana
Every cartridge that fits this model — pulled live from the catalogue:
✓
ZISS420NRGSS specifics — where the filter actually lives
The ZISS420NRGSS carries its water filter at the base of the fresh-food compartment in most side-by-side builds — grille or lower rear — usually a kneeling-height or shoulder-height swap, not a teardown. It is a twist-lock bay: look for the index lugs, offer the cartridge, and rotate until they disappear into the housing.
The small print owners learn the hard way: expect the first swap to take longer than the box suggests — aged o-rings grip — so budget ten minutes, not five. One prefix, one chassis family: the ZIS run is GE’s Monogram built-in side-by-side series; across the run, the filter bay is one of the constants. Trim code SS: cosmetic variants of one chassis, one cartridge family.
ZIS vs PSS — what the prefix tells you
Same parts shelf, two cabinet missions — Chassis first: Monogram built-in side-by-side (ZIS) versus Profile side-by-side (PSS). The shared cartridge line covers both without adaptation. 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.
ZISS420NRGSS filter questions
ZISS420NRGSS filter light will not turn off — what is the reset step?
With the new cartridge seated, press and hold the filter reset until the light clears — panel placement differs, so the ZISS420NRGSS manual’s filter section has the exact control for your trim.
Running the ZISS420NRGSS with an empty filter bay — does it need a cap?
The bay self-seals: with no cartridge the ZISS420NRGSS still dispenses, just unfiltered. No bypass plug exists for this line.
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 ZISS420NRGSS?
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
| Cartridge | OEM MWF | RECOMMENDEDMWF Replacement Water Filter · 1-Pack – ClearFit | MWF Replacement Water Filter · 3-Pack – ClearFit | MWF Replacement Water Filter · 6-Pack – ClearFit |
|---|---|---|---|---|
| Price | OEM list | $14.99 | $37.47 | $67.44 |
| Verified fit | ✓ the bay cartridge | View & buy → | View & buy → | View & buy → |
This filter expires six months from today
Your HVAC filter is probably on a different cycle. Track them all in one place.
months until this filter should be replaced (200-gal rated life)
Free tool · tracks fridge + HVAC + whole-house · auto-refill optional
More models using this filter
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