Catit pixi replacement pump: which one fits your fountain
- Get the part number right before anything else — the plain PIXI Fountain takes pump 43715, the PIXI Smart Fountain takes 44835, and the Fountain 2.0 takes a third part — the wrong one won't fit.
- Rule out cleaning first — a full descale and sensor pin clean fixes most Catit Pixi pump issues — confirm you've done this before spending money.
- Mechanical wear is common — repeated limescale cycles wear the impeller and magnet even after cleaning, eventually causing permanent seizing or weak flow.
- Replace the pump alone if the rest works — a replacement pump is the cheaper fix when the reservoir, sensors, and tray are still in good shape.
- Replace the whole fountain if the chassis is also failing — cracked plastic, a worn tray, or an unreliable app connection point to a fountain near the end of its life, not just a dead pump.
- Still humming, still no water — the motor makes noise, but water is not reaching the drinking surface, even after a full descaling.
- Red light won't clear — the front nose LED keeps blinking or glowing red for a low-water or empty warning, even though the reservoir is full and the sensor pins are clean.
- New grinding or clicking noise — a metallic scraping sound that wasn't there before, even with a visibly clean impeller.
- Very weak flow — water trickles instead of flowing normally, despite the impeller chamber being free of scale.
Your cat can still drink, but flow or filtration is off. Keep a backup bowl filled until this is sorted.
Why a pump wears out beyond cleaning
Descaling restores a scaled-up pump to normal, but it does not undo mechanical wear that builds up over repeated limescale cycles. Two failure patterns show up after cleaning no longer helps.
Worn rotor and magnet from repeated scaling
Every limescale cycle deposits hard mineral crystals on the impeller magnet and inside its well, then a soak dissolves them again. Over many cycles, this repeated buildup and removal gradually roughens the magnet's surface and the plastic bearing it spins in. The pump keeps humming, but the motor can no longer turn a rotor that no longer sits or spins as cleanly as a new one, so flow drops even when the chamber looks clean.
Pump doesn't restart at all after cleaning
In some cases, a fully cleaned and reassembled pump simply produces no hum, no vibration, and no flow when plugged back in. A quick visual continuity check — confirming the power cord and waterproof plug seal are seated, and that the pump makes any noise at all when connected directly to power — usually points to a dead motor rather than a wiring issue. This pattern almost always means the pump itself has failed, not the water quality.
If both cleaning and a basic continuity check leave the pump silent or weak, the checklist below confirms whether it's time to buy a replacement.
Confirm before you buy
Run through these three checks in order before spending money — they cover the free fixes that resolve most Catit Pixi pump problems. If you haven't done them yet, the free fix is here, step by step: Catit Pixi Smart Fountain pump and red warning light fixes.
What the light is telling you
The nose light doubles as the water-level indicator, so read it before you conclude anything about the pump.
| What you see | What the manual says | What to do about it |
|---|---|---|
| Flashing red | Refill the reservoir | If the reservoir is genuinely full, it's the reading that's wrong, not the water — clean the two conductivity pins and refill with tap water, not distilled. |
| Solid red | Out of water; the fountain stops the pump automatically to protect it | Refill and let it restart. A unit that stays solid red on a full reservoir is reading the level wrong, which is a sensor-pin problem before it's a pump problem. |
| Humming, but no flow | Not a documented light code | The motor is powered and the impeller isn't moving water — descale first, then treat it as mechanical wear. |
| No light, no hum, no flow | Not a documented light code | Confirm the waterproof plug is seated and try a different USB adapter and cable, then treat the pump as dead — this is the pattern that a replacement pump actually fixes. |
If you've completed all three checks and the pump is still silent, still weak, or still humming without flow, treat it as worn out rather than scaled up — the replacement options below cover both a pump-only fix and a full fountain swap.
Still dead or weak after all three checks?
A replacement pump is the direct fix when the rest of the fountain still works normally.
Which pump fits your fountain
Catit sells several fountains under the Pixi name, and they do not all take the same pump. This is where the money gets wasted: the part looks nearly identical in a listing photo, the listings are titled loosely, and Catit's own product page for the pump currently redirects to the catit.us home page instead of showing the part. Start by identifying your fountain, then match the part number.
Identify your fountain in ten seconds
- There's a light on the pump and the fountain shows up in the Catit PIXI app over Wi-Fi — you have a PIXI Smart Fountain. Its pump is part number 44835.
- No app, no Wi-Fi, no light on the pump — you have a plain PIXI Fountain, in either the plastic or the stainless steel version. Its pump is part number 43715.
- Neither description fits, or your fountain is a Fountain 2.0 — it takes a different pump again, and a Pixi pump won't do the job.
| Your fountain | Pump to order | Part number | What to watch for |
|---|---|---|---|
| Catit PIXI Fountain (plastic) | PIXI Fountain pump | 43715 | This is not the Smart pump. A retailer listing for it carries the warning verbatim: "Pump is not suitable for the Catit PIXI Smart Fountains". |
| Catit PIXI Fountain, stainless steel | Same pump family as the plastic PIXI Fountain | Not published separately on the listings checked | Confirm with the seller before ordering if the listing doesn't name your exact fountain — the stainless steel model shares the Pixi reservoir design but sellers rarely spell out compatibility. |
| Catit PIXI Smart Fountain | PIXI Smart Fountain replacement pump | 44835 | The non-smart 43715 pump does not fit. Check that the listing says "Smart" in the title, not just in the URL. |
| Catit Fountain 2.0 | Fountain 2.0 pump — a different part | Not published on the listings checked | At least one Amazon listing with "PIXI" in its URL actually ships the Fountain 2.0 pump. Judge the listing by its title and photos. |
- The listing URL says PIXI and the box holds a Fountain 2.0 pump. URLs get reused; titles and photos are the reliable signal.
- A pump explicitly ruled out for the Smart fountain. One retailer, Ren's Pets, states it outright — "Pump is not suitable for the Catit PIXI Smart Fountains" — which is exactly the sentence most listings omit.
- A seller that can't ship to you. Miscota shows the part but is blocked for US shipping, so the listing looks available and isn't.
- No USB power adapter in the box. Two sellers mention it in fine print only. The pump comes with its cable, not with a mains adapter — keep the one you have.
Prices across the sellers checked run from $14.69 to $27.26 for the same class of part, so it's worth comparing two or three listings once you know your part number — but only among listings that name your fountain.
If the issue persists: replacement options
Once the free fixes are exhausted, the choice comes down to how much of the fountain is actually failing. A Catit Pixi fountain typically stays in service for a while before the pump wears out; if the reservoir, tray, and sensors are still in good condition, a standalone replacement pump is the smaller investment. If the plastic housing is cracked, the tray is warped, or the app connection is unreliable on top of the dead pump, the whole unit is likely near the end of its service life and a new fountain is the more durable fix. The pump linked below is the PIXI Smart Fountain pump, part number 44835 — if you own a plain PIXI Fountain, order the 43715 pump instead, using the table in section 03.
As an Amazon Associate, Pet Infrastructure earns from qualifying purchases. We may receive a commission when you buy through our links, at no extra cost to you.
Tools and time: fitting the new pump is a hand-tight job — the Pixi pump is fully detachable from the reservoir, so nothing on the fountain has to be dismantled, and about 10 minutes covers the swap, the seating of the waterproof plug and a refill. Keep the old pump until the new one has run for a day: it's the only way to be sure the fault was the pump and not the water level reading.
If you're unsure which option fits your fountain, the accordions below cover how to tell a dead pump apart from a fountain that's fully worn out.
Advanced: pump-only vs whole-fountain diagnostics
These two scenarios cover the edge cases that a simple checklist doesn't fully resolve.
How to tell a dead pump from a fountain at end of life
Age matters: a pump that fails after roughly a year or more of regular use, on a fountain that is otherwise in good shape, is a normal wear pattern and a good candidate for a pump-only replacement. A fountain where the pump fails soon after purchase, or fails repeatedly within a short window despite proper cleaning, points to a different problem and may be worth raising with Catit support instead of replacing parts repeatedly.
Also check the plastic housing and drinking tray. Cracks, warping, cloudy or brittle plastic, or a tray that no longer sits flush are signs the chassis itself is aging, not just the pump. A fountain showing several of these signs at once is closer to end of life than a single pump replacement can fix.
Hard water and how often to descale a new pump
Households on hard tap water build up limescale faster, which shortens the mechanical life of any pump, new or old. Catit's own maintenance schedule for the Pixi Smart Fountain is a pump clean every 60 days, prompted by a notification in the app. Once a replacement pump is installed, sticking to a fixed schedule like that — rather than waiting for symptoms like humming or a red light — reduces the mineral buildup that gradually wears the impeller magnet and bearing surface described in section 01.
Frequently asked questions
What is the part number for the PIXI Smart Fountain pump?
44835. The Amazon listing we link is titled "Catit PIXI Smart Fountain Replacement Pump, 44835", which is the reliable way to confirm you're on the right page. The non-smart PIXI Fountain pump is a different part, 43715.
Is the Catit PIXI pump compatible with the PIXI Smart Fountain?
No. They are two different parts — 43715 for the plain PIXI Fountain, 44835 for the PIXI Smart Fountain — and one retailer, Ren's Pets, spells the limit out verbatim on its listing: "Pump is not suitable for the Catit PIXI Smart Fountains". If the fountain pairs with the Catit PIXI app over Wi-Fi and has a light on the pump, it's a Smart and needs 44835.
Does the replacement pump include a USB adapter?
Not on the listings we checked — two of them mention it in fine print only. The pump ships with its cable, so keep the mains adapter from your existing fountain rather than assuming a new one is in the box.
The pump of my fountain is no longer working, what should I do?
Work the three free checks first, in order: a full 30-minute vinegar or citric acid soak of the impeller, impeller cap and pump body; a soft clean of the two conductivity pins on the pump housing; and a refill with fresh tap water instead of distilled. If the pump is still silent, still weak, or still humming without flow after all three, it's worn out mechanically rather than scaled up, and the fix is a replacement pump matched to your exact model.
The light on my Catit PIXI Smart Fountain pump is no longer working. What should I do?
Start with power rather than the pump: reseat the waterproof plug, then try a different USB adapter and cable. If the pump neither lights up nor hums with power confirmed, treat it as a dead pump and order the 44835 part. If your fountain is recent, raise it with Catit support before buying — this exact question is one they answer in their own support FAQ, and a young unit may be covered.
Can I replace just the pump instead of buying a new fountain?
Yes, as long as the reservoir, tray, and sensors are still working normally. The pump is a self-contained part that connects to the reservoir's internal socket, so a worn or dead pump can usually be swapped on its own without replacing the whole fountain.
Conclusion
If your Catit Pixi pump is still dead, still weak, or still triggering a false red light after a full descale and sensor clean, you're past the point where cleaning alone will fix it. Confirm the checklist above first, then choose a replacement pump if the rest of the fountain is healthy, or a new fountain if the housing and sensors are showing their age too. Tell us what you're seeing and we can help narrow down which option fits your situation.
Looking for the cleaning steps first? Read our guide for Catit Pixi Smart Fountain pump and red warning light fixes.
Still not fixed? Here’s what to do next.
Some faults are genuinely hardware, and no amount of cleaning or resetting will clear them. If you’ve worked through everything above and it’s still doing it, stop here rather than taking the unit further apart.
- Go to Catit directly. If the unit is still under warranty, let them replace the part rather than paying for it yourself — contact Catit support.
- Tell us what didn’t work. We rewrite bulletins when readers show us a case they don’t cover — compliance@pet-infrastructure.com. Tell us the model, what the lights are doing, and which steps you already tried.
- Ask other owners. Search Reddit for your model name plus the symptom (for example “Catit® PIXI® Smart Fountain not cycling”). Someone has almost certainly hit the same fault, and owner threads often surface fixes before the manufacturer documents them.
When to stop and call the manufacturer: if the fix needs the base opened, the motor or control board touched, or any tool beyond a screwdriver — stop. On a unit in this price range, opening it yourself usually voids the warranty, and a warranty repair costs nothing.
Did this actually fix it? 🐾
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Written by Alberto Guardia
I’m a physician working in medical informatics, and I run Pet Infrastructure on my own — no team, no manufacturer sponsorship, no paid placements. I share my home with Wolfgang, a 13-year-old Chartreux with firm opinions about litter and none whatsoever about firmware.
How this page was put together. Every light code, button sequence and timing here is traced back to Catit’s own documentation, to official support articles, or to several owner reports that agree with each other — and the guide tells you which. Where something genuinely isn’t documented anywhere, I say so instead of filling the gap.
How I check every guide → · Last updated August 2026