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Water Filter for the Monogram ZISP420DTBSS (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:
✓
ZISP420DTBSS specifics — where the filter actually lives
The ZISP420DTBSS carries its water filter bottom of the fresh-food column or at the grille line in most side-by-side builds, a spot that survives trim changes across the ZIS run. This is a twist-style bay, the friendlier design: half a turn of wrist work in each direction is the whole procedure; everything else is towel management.
Owners of the ZISP420DTBSS report the same friction points: flush before the first glass — new carbon beds shed fines for the first gallon or so, which is cosmetic, not contamination. The badge reads ZISP420DTBSS, but the chassis reads ZIS: ZIS machines come from the Monogram built-in side-by-side program, and GE’s parts system rewards you for knowing it: one cartridge family covers the run. Finish codes such as SS change the look, not the plumbing — order the cartridge by model, ignore the finish letter.
ZIS vs PSS — what the prefix tells you
Same parts shelf, two cabinet missions — Monogram built-in side-by-side builds carry ZIS; Profile side-by-side builds carry PSS. Filter-wise the two lines converge on one cartridge family. The two digits after the letters are the cabinet size: this is a 42 cu ft refrigerator, which sets how much dispenser work the cartridge does between changes.
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.
ZISP420DTBSS filter questions
ZISP420DTBSS 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 ZISP420DTBSS manual’s filter section has the exact control for your trim.
Is a bypass plug required for the ZISP420DTBSS 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 ZISP420DTBSS?
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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