Kenmore 625343400 water filter housing Parts

To identify the correct water filter, match the filter to your appliance’s model number. If you have a Kenmore 625343400, that model is a water filter housing (not a refrigerator), and it uses replaceable filter cartridges; the approved cartridge types and replacement steps are listed in the 625343400 owner's manual.

Step 1: Confirm what you are filtering (refrigerator vs. housing)

Many Kenmore refrigerators use a “push-in” or “twist-in” refrigerator filter, but model 625343400 is a plumbed-in filter housing installed on a cold-water line.

Use these quick checks:

• If the filter is inside the fridge (ceiling, grille, or bottom kickplate), you need a refrigerator filter matched to the refrigerator model number.
• If the filter is a canister/housing on a water pipe (often near a basement, utility room, or under-sink line), you have a filter housing like Kenmore 625343400.
• The housing is for potable, safe-to-drink cold water only (typical supply range is 40 to 100°F).
• The housing is designed for typical home water pressure (up to 125 psi; add a pressure-reducing valve if your supply is over 100 psi).

Step 2: Choose the correct cartridge for Kenmore 625343400

For this Kenmore water filter housing, the cartridge choice is typically based on how fine you want to filter (micron rating) and how quickly your water loads the filter.

Common cartridge options for this model include:

• Sed cart 5 m 3848007 (finer filtration; can clog faster with heavy sediment)
• Sed cart 25m 3847807 (coarser filtration; often lasts longer in high-sediment water)

Quick comparison

Cartridge option	Typical use	What you may notice
5 micron	Better sediment reduction	More frequent changes if water is dirty
25 micron	Basic sediment reduction	Better flow and longer life in many homes

Step 3: Replace the cartridge safely

Follow the pressure-relief steps in the manual before opening the housing.

We recommend:

• Close the nearest shutoff valve feeding the filter
• Press the vent valve on top of the head to relieve pressure
• Unscrew the sump carefully (it will be full of water)
• Keep track of the large O-ring seal and clean the sump before reassembly

Why it matters

Using the correct filter type protects water flow, reduces leaks at the housing, and helps you avoid premature clogging. Matching the cartridge to your water conditions (sediment level) is the fastest way to get consistent filtered water.

Last updated: January 2026

On Kenmore model 625343400 water filter housing, a cartridge usually will not lock in place when the housing is still under water pressure, the cartridge is not fully seated, or the sump and O-ring area are dirty or misaligned. Relieve pressure, clean the sealing surfaces, then reinstall firmly.

Quick checks that fix most “won’t lock” issues

• Shut off the cold water supply feeding the filter housing.
• Press the vent valve on top of the head to relieve pressure (a little water leakage is normal).
• Remove the sump and confirm the large O-ring is present, clean, and seated evenly.
• Clean the inside of the sump with hot, soapy water and rinse well.
• Reinstall the cartridge straight, then thread the sump back on snugly (do not cross-thread).

Step-by-step: reseat the cartridge so it locks

1. Close the nearest shutoff valve on the supply line to the filter.
2. Press the vent valve to fully depressurize the housing.
3. Remove the sump; keep track of the large O-ring.
4. Clean the sump and the O-ring groove; wipe the filter head sealing surface.
5. Install the cartridge, then reinstall the sump and tighten until fully seated.

For the exact cartridge replacement procedure and diagrams, follow the 625343400 owner's manual.

Common causes and what to do

What you notice	Most likely cause	What to do
Sump starts but won’t fully thread	Cross-threading or debris on threads	Back off, clean threads, start again squarely
Cartridge feels “springy”	Pressure not relieved	Shut off water, press vent valve, retry
Drips after reinstall	O-ring dirty, twisted, or pinched	Clean and reseat O-ring; replace if damaged
Won’t seat with new cartridge	Wrong cartridge type/size	Match the cartridge to the model and part listing

Parts that fit this model

If you need a replacement cartridge for Kenmore 625343400, use a model-matched filter such as the sed cart 5 m 3848007 (part number 42-34362) or the sed cart 25m 3847807 (part number 42-34360), depending on the filtration level you want.

Why it matters

A cartridge that does not lock or seat correctly can cause leaks, reduced flow, and poor filtration performance. Depressurizing the housing and keeping the sump and O-ring clean prevents most fit and lock problems.

Last updated: January 2026

The Kenmore 625343400 water filter housing typically lasts 10 to 15 years with normal indoor use. In day-to-day ownership, the part you replace on a schedule is the filter cartridge; most sediment cartridges used at a single faucet last up to about 6 months (per the owner's manual).

What “lifespan” means for this model

The housing is a durable plastic assembly (head, sump, and seals) that’s designed to be reused for years. Ongoing performance depends mostly on cartridge changes and keeping seals in good condition.

• Housing lifespan (typical): 10 to 15 years
• Cartridge lifespan (common): up to about 6 months for sediment filtering to 1 faucet
• Shorter cartridge life if you filter more water (whole-house use) or have heavy sediment
• Replace sooner if you notice pressure drop or the return of taste, odor, or sediment

Cartridge replacement intervals (quick guide)

What you notice	Most likely cause	What to do
Water pressure drops at the faucet	Sediment cartridge is loaded	Replace the cartridge
Taste/odor returns	Carbon cartridge is spent	Replace the cartridge
Drips at the sump	O-ring dirty, dry, or damaged	Clean, lubricate, or replace the O-ring

Parts that commonly drive “end of life” symptoms

If the housing is leaking or hard to open, the fix is often a seal or cartridge, not the entire unit.

• Replace the cartridge on schedule (example: sed cart 5 m 3848007 or sed cart 25m 3847807)
• Inspect the sump O-ring for cuts or flat spots
• Clean the sealing surfaces; re-lubricate the O-ring with silicone grease
• Confirm the housing is used on cold, potable water as intended

Why it matters

A fresh cartridge protects flow and water quality; a maintained O-ring prevents leaks that can damage cabinets and countertops. Staying on a cartridge schedule is the simplest way to keep the 625343400 performing like it should.

Last updated: March 2026