This maintenance guide comes from years of hands-on customer support for robot vacuum owners, now published here for anyone to use rather than kept inside one support inbox. Several of the models and parts named below link out to Plus.Parts®, the maintenance parts store run by the same company behind this site, and that is also where much of the experience behind this guide comes from.
The Haier SWR series represents the robot vacuum range that Haier, one of the world’s largest home-appliance manufacturers, produced for the European market on the same compact 300 mm round platform that underpins a wide family of entry-level robots sold across the continent. All four models in the range, the Haier SWR-T320
, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325, share a bristleless direct-suction inlet, a single sponge-backed HEPA filter, and a pair of three-spoke side brushes. None carries a main brush roll, a mopping attachment, or a self-emptying base. This guide delivers the complete maintenance schedule and service intervals for all four Haier SWR models, together with a direct comparison of what distinguishes each variant in the range.
Why Haier SWR series robots need more frequent maintenance
A 14.4 V brushed motor at 600 Pa has no spare capacity against a loading filter
Every model in the Haier SWR range operates on a 14.4 V brushed motor producing working suction in the region of 600 Pa. At that level, the motor delivers consistent results on smooth hard floors and low-pile rugs, but the narrow gap between its operating output and the suction level at which cleaning becomes ineffective means there is almost no reserve power available to compensate for increased airflow resistance as the filter accumulates dust. On a modern robot vacuum operating at 3,000 Pa or above, a partially blocked filter produces a slow, barely perceptible decline in pick-up that owners may not notice for several sessions. On the Haier SWR platform, the same degree of filter loading produces a visible and immediate drop in cleaning quality. Hair and fine dust particles are drawn toward the inlet but escape recapture and settle back onto the floor ahead of the machine because the suction force needed to hold them through the airway has been partially cancelled by back-pressure from a dirty filter. This is not a mechanical failure; it is the predictable consequence of the power-to-resistance ratio on a compact brushed platform. Weekly filter maintenance is therefore not an optional element of caring for the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, or Haier SWR-T325; it is the single most effective action an owner can take to maintain consistent session quality.
A 0.3 litre dust bin with no full-bin detection or automatic pause
All four Haier SWR models use a 0.3 litre rear-access dust bin. No model in the range includes a full-bin sensor or software logic that pauses or redirects the robot once the bin has reached capacity. When the bin is full the machine continues its session regardless, redistributing debris it can no longer collect back across surfaces it has already traversed. Long human hair and pet hair are particularly problematic because they do not settle loosely inside the bin chamber but instead form a dense, compressed plug at the bin inlet slot before the bin itself is even half full. A compacted inlet slot restricts airflow through the entire system regardless of how much empty space remains inside the bin, producing a symptom that closely resembles a motor or suction fault: the machine runs at apparently normal speed but collects almost nothing. The correct response is to empty the bin after every cleaning session and to inspect the inlet slot at each emptying. Any compacted hair or fibrous debris visible at the slot should be removed before the bin is closed and the machine returned to the dock. On households with multiple pets or with long-haired occupants who clean daily, a mid-session bin check is worthwhile when the robot is covering a larger area than usual.
Bristleless direct suction concentrates all performance dependency on the filter and side brushes
The Haier SWR series uses a bristleless cleaning channel. There is no main brush roll in the inlet housing. Debris is drawn directly through a wide rectangular slot by the motor airstream alone. The absence of a rotating brush roll has one genuine operational benefit: there is no hair-wrap point in the main cleaning channel. Long hair, thread, and fibrous material that would ordinarily wind progressively around a brush roll shaft, choking airflow from inside the motor housing, simply do not accumulate in the same way on this platform. However, the absence of mechanical agitation also means that the filter and side brushes bear the entire burden of cleaning effectiveness without any physical assist from a rotating element. On a robot with a brush roll, even a moderately loaded filter still produces workable results because the roller is physically agitating debris into the airstream ahead of the suction inlet. On the bristleless Haier SWR platform, the motor is doing all the work unaided. When the filter begins to load or the side brushes wear to short, splayed spokes, the decline in cleaning output is immediate and proportional to the degree of degradation. Both components must be kept in good condition continuously; there is no redundancy from a brush roll to compensate for early deterioration in either one.
Gyroscope-assisted random-bounce navigation subjects side brushes to uneven wear
None of the Haier SWR models carries a LiDAR scanner or a camera-based room-mapping system. All four navigate using a gyroscope-assisted semi-random bounce pattern combined with infrared cliff sensors at the leading edge of the chassis to prevent falls from stair edges and drop thresholds. In any given session, areas around furniture legs, in corridor junctions, and in doorways receive multiple repeated passes as the machine turns and reorients, while open floor areas may receive only a single pass or be partially missed altogether. The maintenance consequence is that the left and right side brushes are subjected to different amounts of contact pressure depending on the layout of the home. In a room with many obstacles and tight corridors, the brushes experience more friction and wear faster than they would in a large, open-plan space with clear floor area. Owners should inspect both side brushes at each weekly maintenance session and replace them as a matched pair when either shows visible wear, since running one worn brush alongside a fresh brush produces asymmetric debris sweep across the inlet that reduces overall pick-up efficiency. The infrared sensor lenses at the front and underside of the chassis also accumulate dust unevenly across sessions. Monthly lens cleaning prevents the gradual degradation of fall-detection sensitivity that owners sometimes misdiagnose as a navigation or motor fault in the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325.
Models in this series compared
| Model | Suction | Main brush | Mop | Dust bin | Runtime | Notes |
|---|---|---|---|---|---|---|
| Haier SWR-T320 |
600 Pa | Bristleless direct suction | None | 0.3 L | Approx. 90 min | Founding model; base auto-mode navigation; establishes the SWR chassis and consumable specification |
| Haier SWR-T321 |
600 Pa | Bristleless direct suction | None | 0.3 L | Approx. 90 min | Direct revision of T320; addresses early-production durability considerations; identical maintenance routine and parts |
| Haier SWR-T322 |
600 Pa | Bristleless direct suction | None | 0.3 L | Approx. 90 min | Adds spot-clean function via remote; same chassis and consumables as T320/T321 |
| Haier SWR-T325 |
600 Pa | Bristleless direct suction | None | 0.3 L | Approx. 90 min | Most specified model; adds edge-follow mode which increases side-brush contact along skirting boards (inspect brushes slightly more frequently) |
Shared platform: identical maintenance parts across all four models
The Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325 are all built on the same mechanical and electrical chassis. The sponge-backed HEPA filter, the three-spoke side brushes, and the 0.3 litre dust bin are fully interchangeable across all four models. Owners who switch between variants or who own multiple units in the SWR range can use the same replacement parts for all of them without any model-specific adjustment to the maintenance procedure.
Replacement parts and service intervals
HEPA filter
The sponge-backed HEPA filter is the most maintenance-critical component on the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325. It sits immediately behind the dust bin in a rear-access compartment and is reached by removing the bin and lifting the filter cartridge out of its housing. To clean the filter, tap it firmly against the inside of a waste bin to dislodge loose surface dust. Do not attempt to wash the filter under running water. The sponge backing layer that supports the HEPA medium is not designed for wet cleaning and will not dry uniformly before the next scheduled session; running the robot with a damp filter risks drawing moisture into the fan housing and damaging the motor. On a standard household cleaning schedule, tap-clean the filter weekly and replace it every two to three months. In households with pets or in homes where the robot operates daily on heavily soiled floors, shorten the replacement interval to every six to eight weeks. A filter that has been tap-cleaned over many weeks and has turned persistently grey, has developed creases or tears in the filter medium, or no longer sits flat in its housing should be replaced immediately regardless of how recently it was last cleaned. The 600 Pa suction output of these machines leaves almost no buffer against filter-induced airflow restriction; even a filter that appears only moderately loaded can be reducing effective suction by a material amount in practice. The HEPA filter is not yet listed as a separate single-item product for any of the four SWR models, so the filter links above each point to that model’s Maintenance Set, which includes the filter as one of its contents.
Side brushes
Each of the four Haier SWR models carries two three-spoke side brushes positioned at the front-left and front-right of the chassis. Their function is to sweep debris from along skirting boards, into corners, and out from under furniture edges, directing material into the path of the bristleless inlet slot. Each brush is secured with a small Phillips screw and can be detached and refitted in a few seconds. Inspect both brushes weekly. Look for splayed or bent spokes, visible shortening of the bristle tips, and hair wrapped tightly around the brush hub at the mount point. Hair wrap at the hub does not restrict the brush the way it would on a brush-roll shaft, but a dense accumulation can increase the load on the brush motor over time, generating additional heat and reducing the working life of the motor assembly. At each weekly inspection, cut through any compacted hair strands with small scissors or a seam-ripper and pull them free before reinstalling the brush. Replace both side brushes as a matched pair every three to four months, or sooner if the spoke tips are visibly worn short or if the bristle fibres have lost their outward angle and point straight down toward the floor rather than sweeping outward and inward at the designed contact radius. Running both brushes in the same condition ensures symmetrical debris sweep from both sides of the inlet and consistent edge-cleaning performance across the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325. The side brushes are not yet listed as a separate single-item product for any of the four SWR models, so the side-brush links above each point to that model’s Maintenance Set, which includes the brushes as part of its contents.
Dust bin
The 0.3 litre rear-access dust bin should be emptied after every cleaning session on all four Haier SWR models. Remove the bin from the rear of the chassis, open the bin flap, and tap the contents into a waste bin. At each emptying, check the inlet slot at the front face of the bin where debris enters from the chassis interior. This narrow rectangular opening is the primary blockage point on this platform: hair and fibrous material compact into the slot under the airflow pressure of the motor and will not simply fall out when the bin is opened and tapped. Use a finger or a narrow-bladed tool to dislodge and remove any compacted material from the slot before closing the bin. Every two to three weeks, wipe the interior surfaces of the bin with a dry cloth to remove the fine dust residue that coats the bin walls during normal operation and does not exit when the bin is tapped empty. Avoid washing the bin with water unless it is completely dry before being reassembled with the filter; the filter housing sits directly behind the bin and moisture carried over from a wet bin can shorten filter life and in extended cases may affect the motor assembly. The dust bin is not yet listed as a separate single-item product for any of the four SWR models, so wherever it is referenced elsewhere in this guide, the link points to that model’s Maintenance Set instead.
Cliff sensors and chassis underside
The infrared cliff sensors on the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325 are located at the leading edge of the chassis, facing downward toward the floor. They detect the drop in reflectance at stair edges, elevated door thresholds, and furniture platforms, triggering the machine to reverse before falling. Fine dust accumulates progressively on the sensor lenses over the course of normal operation. As the lens becomes coated, the signal the sensor transmits toward the floor is attenuated before it reaches the floor surface, making normal flooring appear to have lower reflectance than it actually does. The robot responds by treating safe floor areas as potential drop edges and reversing unnecessarily, which disrupts coverage patterns and shortens the effective cleaning session. Monthly cleaning of the sensor lenses with a dry microfibre cloth or a dry cotton swab removes the accumulated film without introducing scratches or solvent residue that could further degrade the optical surface. The two drive wheels and the trailing rear castor should be cleaned at the same monthly interval. Remove any hair or thread wound around the wheel axles, and wipe the rubber wheel surfaces clean of compacted dust to restore consistent traction on smooth hard floors.
Charging contacts
All four Haier SWR models return automatically to their charging dock after each session or when the battery reaches its low-charge threshold. The spring-loaded charging contacts on the underside of the robot and the corresponding contacts on the dock face must remain clean and oxide-free for reliable charging. Dust accumulation and light surface oxidation on the contact faces increase the electrical resistance at the charging connection, which slows the charge rate and can result in the machine sitting on the dock in an apparently charging state without actually completing a full charge cycle. The available runtime on the next session is then correspondingly reduced. Clean the charging contacts on both the robot and the dock face with a dry cloth every two to three weeks. If the contacts show a grey or greenish discolouration, clean them gently with a dry pencil eraser to abrade the oxidation layer from the metal surface before wiping the residue away with a dry cloth.
Battery
All four Haier SWR models are powered by a NiMH battery pack rated at 14.4 V, providing an advertised runtime of approximately 90 minutes per charge on smooth hard floors under standard cleaning conditions. NiMH batteries maintain their capacity best through regular cyclic use. A machine used daily or near-daily on a consistent schedule will typically retain workable capacity for 18 to 24 months before runtime begins to decline perceptibly. Keeping the charging contacts on both the robot and the dock face clean is a direct input into battery health, because oxidised or contaminated contacts slow the charge rate and prevent the battery from completing a full charge cycle, shortening effective runtime without any underlying degradation in the cells themselves. If the machine is stored for more than four weeks, store it with a partial charge and avoid leaving the battery in a fully depleted state, as deep discharge accelerates permanent capacity loss in NiMH cells. When consistent session runtime falls persistently below 60 minutes despite clean contacts and confirmed full charge-discharge cycles, the battery pack has reached end-of-life. Replacement of the NiMH pack restores the original 90-minute runtime and allows the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325 to continue operating at their designed service level.
Maintenance at a glance
| Component | Clean | Replace |
|---|---|---|
| HEPA filter | Weekly (tap-clean over waste bin) | Every 6 to 8 weeks (pet/daily use) or every 2 to 3 months (standard use) |
| Side brushes (pair) | Weekly (remove hair wrap, inspect spoke tips) | Every 3 to 4 months or when bristles are visibly splayed or worn short |
| Dust bin | After every session; wipe interior dry every 2 to 3 weeks | Replace if cracked or if bin flap no longer seals flush |
| Bin inlet slot | At every emptying (clear hair plugs) | — |
| Cliff sensors | Monthly (dry microfibre cloth or cotton swab) | — |
| Drive wheels and castor | Monthly (remove axle hair, wipe rubber surface) | — |
| Charging contacts | Every 2 to 3 weeks (dry cloth; eraser for oxidation) | — |
| Battery (NiMH) | Keep contacts clean; cycle regularly; store partially charged if unused for 4+ weeks | When runtime falls persistently below 60 min despite clean contacts and full charge cycles |
Common problems and their maintenance causes
Suction drops noticeably during a session
A mid-session drop in suction on any of the Haier SWR models is almost always traceable to one of two causes: the bin inlet slot has become compacted with hair and the effective airflow path has narrowed regardless of bin fill level, or the filter has loaded to a degree at which the motor can no longer overcome the airflow resistance. The first diagnostic step is always the bin. Remove it, clear the inlet slot, and empty the bin completely. If suction does not recover, remove the filter and tap it clean over a waste bin. On the 600 Pa platform of the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325, these two steps resolve the vast majority of mid-session suction complaints. If suction remains noticeably reduced after both steps, inspect the channel between the inlet slot and the fan housing for any obstruction that may have passed through the inlet without reaching the bin. Neither the filter nor the dust bin is yet listed as a separate single-item product for any of the four SWR models, so the model links above each point to that model’s Maintenance Set instead.
Robot leaves fine debris on hard floors even after completing a session
When the Haier SWR-T320 or any of the other three SWR models leaves a visible trail of fine dust, hair strands, or light particles across hard floors after what appeared to be a completed session, the cause is almost always a filter loaded enough to reduce effective suction below the threshold needed to capture lightweight material through a bristleless inlet. There is no brush roll on these machines to mechanically lift particles into the airstream; suction is the only collection mechanism. Even moderate filter loading at this suction level is sufficient to allow fine debris to approach the inlet and then settle back onto the floor as the machine moves on. Tap-clean or replace the filter, empty and clear the bin inlet slot, and run the session again. If the symptom persists after a confirmed fresh filter and an empty bin, check whether the HEPA medium has developed small tears or holes that allow unfiltered air to bypass the medium and allow fine particles to be expelled back into the room rather than collected. The filter is not yet listed as a separate single-item product for this model, so the link above points to its Maintenance Set instead.
Side brush throws debris outward instead of sweeping it inward
When one or both side brushes on the Haier SWR-T321, Haier SWR-T322, or any other SWR variant is deflecting dust and hair outward rather than sweeping it toward the inlet, the most common cause is spoke wear. A new three-spoke brush makes contact with floor debris at a precise radial distance that directs material inward at an angle compatible with the inlet slot location. A worn brush with shortened or permanently splayed spoke tips makes contact further from the hub and at a shallower angle, deflecting material laterally or rearward rather than inward. Replace both side brushes as a matched pair when this symptom appears. Running one worn brush and one fresh brush simultaneously creates an asymmetric sweep pattern that reduces collection efficiency from both sides of the inlet. The side brushes are not yet listed as a separate single-item product for these models, so the links above each point to that model’s Maintenance Set instead.
Machine reverses away from safe floor areas near dark rugs or transitions
The infrared cliff sensors on the Haier SWR range detect drop edges by measuring the difference in light reflectance between a solid floor surface and an open drop. Dark-coloured floor surfaces and dark rug edges absorb rather than reflect the sensor beam, producing a low-reflectance reading that the sensor firmware interprets as a potential drop edge. The robot reverses accordingly even though no drop exists. Dusty sensor lenses compound this problem by reducing the transmitted signal before it reaches the floor, making any surface appear darker than it is. Monthly lens cleaning is always the first corrective step. If the problem persists after cleaning, placing a strip of light-coloured tape or a pale floor mat at the edge of the dark rug gives the sensor a high-contrast surface to read and prevents unwanted reversal in that location.
Robot returns to the dock prematurely with significant runtime remaining
If the Haier SWR-T322, Haier SWR-T325, or either of the other SWR models returns to the charging dock well before the approximately 90-minute expected runtime, battery capacity is the most likely long-term cause, but dirty charging contacts are a common and easily corrected contributor to this symptom. Contaminated contact faces cause incomplete charge cycles: the machine appears to sit on the dock and charge normally but the battery never reaches its full state of charge, and the available runtime on the next session is correspondingly reduced. Clean both sets of contacts with a dry cloth and, if oxidation is present, with a dry eraser. Allow the machine to complete two full charge-discharge cycles after contact cleaning before drawing any conclusions about underlying battery health. If premature dock returns persist after clean contacts and confirmed full charge cycles, the NiMH battery pack has reached end-of-life and should be replaced.
Navigation becomes erratic and the robot circles or fails to change direction after wall contact
Erratic movement on the Haier SWR-T320 or the other three SWR models, particularly tight repeated circles or failure to respond normally after a wall contact, most commonly results from differential drive wheel resistance rather than a software or navigation fault. When one drive wheel has accumulated a dense ring of hair wound tightly around its axle, it spins at a different effective speed from the opposite wheel, causing the machine to curve or circle continuously rather than executing the straight lines and gradual arc corrections its bounce navigation requires. Remove the robot’s underside cover if needed to access both axle points, cut through any compacted hair, and wipe the rubber tyre surfaces clean. Clear both wheel axles at each monthly chassis cleaning session to prevent this from developing gradually across multiple weeks of normal use.
Brush motor makes a grinding or dragging sound during operation
An audible grinding or dragging noise from a side brush on the Haier SWR-T321, Haier SWR-T322, Haier SWR-T325, or any other SWR model is typically caused by hair or thread wound so tightly around the brush hub and mount shaft that the brush motor is operating against abnormal mechanical resistance. Left unaddressed, this increases electrical load on the brush motor circuit over extended sessions and can lead to premature motor wear. Remove both side brushes, cut through any compacted hair at the hub and around the screw mount point, and clean the mount shaft before reinstalling. If the sound persists after brush cleaning and reinstallation, the brush itself may have a cracked hub or bent spoke that is causing the brush to rotate out of true, in which case replacement of the affected brush resolves the issue. The side brush is not yet listed as a separate single-item product for these models, so the links above each point to that model’s Maintenance Set instead.
What consistent maintenance protects over time
On an entry-level robot vacuum operating at 600 Pa with a bristleless inlet and no room-mapping capability, the cleaning quality delivered by each session is determined almost entirely by the condition of the filter, the side brushes, and the bin inlet. There is no algorithmic compensation for missed zones, no second-pass logic, and no brush-roll assist to maintain pick-up through a partially loaded filter. For the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325, the performance difference between a well-maintained machine and a neglected one of the same model is large, immediate, and visible on any hard floor surface. Owners who maintain the weekly filter and side-brush routine, empty the bin after every session, and carry out the monthly sensor and wheel cleaning will find that all four models perform at their designed level for two to three years of regular daily or near-daily use without degradation in pick-up quality or reliability.
The Plus.Parts® Maintenance Set for the Haier SWR series includes a replacement sponge-backed HEPA filter and a matched pair of three-spoke side brushes, providing everything needed for a complete maintenance refresh in a single purchase. The components in the maintenance set meet the same dimensional and airflow specifications as the originals, ensuring that replacement parts help maintain full performance rather than introducing a further variable into the maintenance cycle.
How the Haier SWR series models differ
SWR-T320 and SWR-T321: the base tier of the SWR range
The Haier SWR-T320 was the founding model of the Haier SWR robot vacuum range, establishing the compact 300 mm round chassis, the bristleless direct-suction inlet, the sponge-backed HEPA filter, and the semi-random gyroscope-assisted navigation that all subsequent SWR models share. It was designed for smooth hard-floor households with light-to-moderate debris loads and straightforward floor plans. The single auto-mode navigation is sufficient for open living spaces and kitchen floors with clear skirting boards, and the approximately 90-minute runtime covers a generous area on a single charge in those conditions. The Haier SWR-T321 is a direct revision of the T320, sharing all major mechanical and electrical specifications. The revision updated certain internal components to address early-production durability considerations, with no changes to the external chassis dimensions, the cleaning channel, the filter housing, or the side-brush configuration. Owners of the T320 and T321 follow an identical maintenance routine and use the same replacement parts with no substitution required. The two models are interchangeable from a servicing perspective.
SWR-T322 and SWR-T325: revised and extended variants
The Haier SWR-T322 continued the incremental development of the SWR line with additional cleaning-mode options available from the remote control, including a spot-clean function that concentrates the robot’s coverage pattern in a tight spiral around a defined area before returning to the auto-bounce routine. The mechanical platform remained unchanged from the T321, and the filter, side brushes, and bin are identical across all three earlier models. The Haier SWR-T325 represents the most fully specified model in the SWR range. It retains the same bristleless cleaning channel, the same sponge-backed HEPA filter, and the same three-spoke side brush configuration as the T320 through T322. The T325 added an edge-follow mode alongside the standard auto and spot functions, allowing the machine to trace skirting boards and furniture edges more methodically than the standard bounce pattern achieves in a single pass. This mode increases side-brush contact time along edges and slightly accelerates side-brush wear in rooms with long skirting-board runs, making the weekly brush inspection marginally more important for T325 owners than for those running the base models. All four SWR models use the same replacement filter and side-brush set, and the maintenance intervals are the same across the range regardless of which model variant is being serviced.
Battery and NiMH considerations across all four models
All four Haier SWR models carry a NiMH battery pack that provides an advertised runtime of approximately 90 minutes per charge under standard floor conditions. NiMH batteries retain their capacity best when kept in regular cyclic use. A machine left uncharged for several months will typically show a measurable reduction in available runtime on its first sessions back in service, but will usually recover close to normal capacity after two to three full charge-discharge cycles. If the machine will be stored for more than four weeks, store it with a partial charge rather than a full one and never leave it stored with a fully depleted battery; deep discharge of NiMH cells accelerates permanent capacity loss. When consistent runtime falls meaningfully below 60 minutes despite clean charging contacts and confirmed full charge cycles, the battery pack has reached end-of-life and replacement is the appropriate next step. On the Haier SWR-T320, Haier SWR-T321, Haier SWR-T322, and Haier SWR-T325, running the robot on a consistent weekly schedule is the best single practice for preserving battery health over multi-year ownership.
Type reference
| Type | Alternative type | Retail type |
|---|---|---|
| V3 | — | — |
| V5 MAINTENANCE SET | — | — |
