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Water Filter for the Monogram ZISW420DXA (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:
✓
ZISW420DXA specifics — where the filter actually lives
On the ZISW420DXA, the cartridge in the lower fresh-food zone in most side-by-side layouts, knee height or below — usually a kneeling-height or shoulder-height swap, not a teardown. Mechanically the ZISW420DXA uses a twist-in cartridge: look for the index lugs, offer the cartridge, and rotate until they disappear into the housing.
The small print owners learn the hard way: the reset control is the step everyone skips; the light will not acknowledge a new cartridge on its own. Prefix literacy pays here: when GE stamps ZIS on the plate it is sorting the machine into the Monogram built-in side-by-side class — same water path, same cartridge, different cabinet. The XA tail marks finish variants of one chassis; the filter bay is shared across the entire finish range.
ZIS vs PSS — what the prefix tells you
The ZIS prefix sits next to PSS in the catalog and the split is cabinet mission: split by cabinet mission (Monogram built-in side-by-side versus Profile side-by-side), joined by cartridge line — that is the ZIS/PSS story. Cabinet decode: 42 cubic feet — the number that tells you whether this cartridge feeds a family-size dispenser or a compact one.
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.
ZISW420DXA filter questions
How do I reset the filter light on the GE ZISW420DXA?
Lock in the new cartridge first, then hold the reset control for a few seconds — the ZISW420DXA manual documents the button for each panel variant.
Is a bypass plug required for the ZISW420DXA when the cartridge is removed?
No — the MWF bay seals on the cartridge itself, so removing it just means unfiltered water until the next change, not a leak.
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 ZISW420DXA?
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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