Mitsubishi Electric MR-HS421EX water filter
The Mitsubishi Electric MR-HS421EX takes the Mitsubishi Electric Water Tank Filter (part KIEHJ3526) as its water filter; replace it every 12 months; Australian sellers list it from A$31.36 as of 1 August 2026. This fit is listed by sellers and not yet confirmed against the manufacturer's list.
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Your fridge
Mitsubishi Electric MR-HS421EX
HS4
Takes this filter
Water Tank Filter
KIEHJ3526
Listed by sellers as compatible, not yet confirmed against the manufacturer's list — check the code on your old filter.
The right water filter for MR-HS421EX
Mitsubishi Electric Water Tank Filter
- Replace every 12 months
- Fits inside the fridge
- Fits 23 models
The KIEHJ3526 is the small purification filter that sits in the ice-maker water tank of Mitsubishi Electric MR-CX, MR-LX and MR-WX multi-drawer fridges. It is not a plumbed cartridge: Mitsubishi's manual says to remove and wash it weekly and that it normally does not need replacing unless it is blocked, damaged or growing mould. Genuine replacements cost about $31 from parts distributors.
- Type
- Purification filter fitted in the removable water supply tank of the automatic ice maker (not a plumbed cartridge)
- Cleaning
- Once a week (2-3 times a week if mould forms easily): remove the purification filter and wash with water; tank lid tolerates approx. 60 C
- Replacement
- 'Normally, it does not need replacing.' Replace if something other than water was put in and the opening got blocked, if it is damaged, or if mould is forming
- Fits (distributor-stated)
- MR-C375C, MR-C405C (all variants), MR-CX370EJ, MR-CX402EJ, MR-LX630EM-A; Statewide says Mitsubishi recommends replacing every 9 to 12 months
Every number this part goes by
Where to buy
Every seller we track for this part, cheapest first. Genuine is the manufacturer's own part; compatible is a third-party filter made to fit. Prices are re-checked daily where the seller publishes them. Last checked 1 August 2026.
How long it lasts
Replace every 12 months.
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point of the filter.
Not due yet?
This filter is due every 12 months. We'll email you when it's time — free, no spam.
Fitting it
A few minutes, no tools. Watch it done, then follow the steps.
Step-by-step instructions for this filter are being checked against the manufacturer's guide.
About your Mitsubishi Electric MR-HS421EX
Mitsubishi Electric fridge — HS4. Its water filter is the Water Tank Filter, part KIEHJ3526, changed every 12 months.
Checking the model number: Open the fridge door: the sticker is usually on the inside wall (left side, near the top) or behind the top crisper drawer.
Fits these models
Common questions
- Which water filter fits the Mitsubishi Electric MR-HS421EX?
- The Mitsubishi Electric MR-HS421EX takes the Mitsubishi Electric Water Tank Filter (part KIEHJ3526). Compatible filters made to the same specification also fit.
- How often should I replace the water filter in my Mitsubishi Electric MR-HS421EX?
- Every 12 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the KIEHJ3526 in Australia?
- We track 2 Australian sellers for the KIEHJ3526; the lowest listed price when we last checked was A$31.36 at sydney_appliance_service. Prices are re-checked daily and dated on this page.
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