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First identify the machine. A standalone Dyson WashG1 and a Dyson vacuum fitted with the Submarine wet roller head use different water systems and require different fixes. WashG1 streaks or poor pickup usually call for cleaning the roller, debris tray, sprung mangle and squeegee, then checking the tanks and running Self-clean. With Submarine, some water left on the floor is expected; excessive water or leaking usually points to the reservoir cap, snorkel orientation, waste-extraction tray or cassette seating.
Disconnect or safely remove the wet head before handling it, keep water away from electrical connections, and follow the care instructions for your flooring.
Identify your Dyson wet cleaner before changing anything
Look at the product you are holding rather than relying on the symptom. The troubleshooting sequence for one machine does not apply to the other.
| Machine | What it is | Typical symptom wording | First checks |
|---|---|---|---|
| Dyson WashG1 | A dedicated wet floor cleaner with separate clean-water and dirty-water systems | Streaks, dirty finish, poor pickup, debris left behind or no water reaching the floor | Roller, debris tray, sprung mangle, squeegee, tank seating and Self-clean |
| Dyson Submarine wet roller head | A wet roller head used with a compatible Dyson vacuum | Excess water left behind, no water dispensing, a wet floor or a leak | Waste-extraction tray, reservoir cap, snorkel direction, cassette seating and roller-head cleaning |
For a Submarine attachment, also verify that the vacuum and wet head are a compatible combination. Replacement parts are model-specific; a WashG1 roller is not a Submarine roller.
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Prepare the machine safely
- Switch the cleaner off before removing a roller, tank, tray or wet head.
- For Submarine, detach the wet head from the vacuum before turning it over or holding it over a sink.
- Keep water away from the neck connection and other electrical contacts.
- Have a sink, a clean cloth, warm water and a well-ventilated drying location ready.
- Check the flooring manufacturer’s care instructions. A correct machine setting cannot make a floor safe for a surface that should not be wet-cleaned.
Do not judge a roller while it is still saturated or coated with loosened dirt. Clean it first, squeeze out excess water as instructed, let it dry thoroughly, and then test the machine on a small, suitable area.
Fix streaks and poor pickup on Dyson WashG1
Dyson’s WashG1 poor-pickup troubleshooting names four parts: the roller, debris tray, sprung mangle and squeegee. Clean all four before assuming the motor or roller needs replacement.
1. Empty the dirty-water tank and debris tray
- When WashG1 alerts you, remove and empty the dirty-water tank.
- Remove the debris tray and discard the collected solids.
- Rinse the tank and tray regularly, then dry them before reinstalling.
- Clip the dirty-water tank back into place securely. A tank that is not fully seated can prevent normal waste collection.
Dirty water left in the system can make the next pass look worse even after the floor itself has been cleaned. Emptying the waste container is part of normal operation, not only an end-of-life repair.
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- Remove the roller and clear hair, threads, grit and other lodged debris.
- Inspect the debris tray, sprung mangle and squeegee for buildup. Remove anything that could stop the parts contacting the roller or floor as designed.
- Wash the roller with warm water and detergent when debris remains, following the WashG1 guide’s cleaning method.
- Rinse the roller and squeeze out excess water.
- Wash or wipe the other removable parts as directed, then allow every part to dry thoroughly before reassembly.
Use detergent for the roller-cleaning step only as the WashG1 instructions specify. Do not transfer Submarine’s or WashG1’s cleaning-agent instructions to the other machine, and do not add an unapproved product to a tank.
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3. Confirm that clean water can reach the floor
- Remove the clean-water tank and verify that it contains water.
- Fill it to the marked level when necessary; do not exceed the MAX line.
- Reinstall the tank and press it into position until it is seated correctly.
- Run a short test on a suitable floor area. If water still does not appear, switch the cleaner off and repeat the seating check rather than continuing to run it dry.
For a no-water-output symptom, Dyson’s WashG1 troubleshooting specifically directs you to check the tank’s water level and seating. Those checks should precede any assumption that the roller is worn.
4. Run the WashG1 Self-clean cycle
Use Self-clean after the main cleaning session or after a dirty-water problem. The cycle has a defined preparation and cleanup sequence:
- Empty the debris tray.
- Empty the dirty-water tank.
- Fill the clean-water tank to MAX.
- Install the clean-water tank and start Self-clean.
- When the cycle finishes, empty the debris tray and both tanks again as instructed.
- Rinse the tanks and tray and dry them before storage.
Self-clean does not replace manual removal of hair or other material wrapped around the roller, mangle or squeegee. If streaks remain, return to those parts after the cycle and inspect them directly.
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Dyson recommends replacing the WashG1 roller every six months, or sooner if it is worn. That is a maintenance interval, not a diagnosis that every streak is caused by the roller. Cleaning and drying come first; replace the roller when the six-month interval has arrived or its condition shows wear.
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When ordering a replacement, verify that it is specifically for WashG1. A part intended for another Dyson wet-cleaning system may not fit or perform correctly.
6. Address possible limescale in the clean-water system
The WashG1 guide recommends descaling the clean-tank filter mesh every six months. Remove the mesh as directed and soak it for one hour in citric acid or vinegar, then rinse and reinstall it according to the guide.
This one-hour soak is a filter-maintenance instruction. It is separate from washing a roller with warm water and detergent, and it is not permission to pour concentrated cleaning chemicals into the tank or onto the floor.
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Understand what is normal
Dyson’s Submarine troubleshooting guidance states: “Water left behind by the Dyson Submarine™ wet roller head is expected.” A damp track after a pass therefore does not automatically indicate a defect. The relevant question is whether the amount is consistent with normal wet cleaning or whether water is pooling, running from the head, or continuing to leak while the machine is parked.
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1. Empty the waste-extraction tray
- Turn the vacuum off and detach the Submarine head.
- Hold the head over a sink.
- Empty any water from the waste-extraction tray.
- Wipe the tray and surrounding area if dirty.
Dyson recommends emptying leftover water from the Submarine water system after each use. Water left in the tank can contribute to leaking when the head is stored or moved.
2. Tighten the reservoir cap
- With the head safely detached, locate the water-reservoir cap.
- Secure it by turning it clockwise as directed.
- Check that the cap is sitting evenly and is not cross-threaded or visibly damaged.
A loose cap can allow water to escape before it reaches the roller. If the cap or its sealing surface is damaged, stop using the head and contact Dyson rather than improvising a seal.
3. Point the snorkel opening toward the floor
When the Submarine head is in use, the snorkel opening should face downward toward the floor. Incorrect orientation can disturb water delivery and leave more water behind than intended. Recheck the orientation whenever the cassette or reservoir has been removed.
4. Reseat the cassette
- Remove the cassette as directed by the Submarine instructions.
- Align its guide with the channel.
- Slide it back until it clicks fully into place.
- Confirm that it sits flush rather than tilted or partially engaged.
A cassette that is not fully seated can affect both water delivery and waste extraction. Test again only after the click and guide alignment are confirmed.
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Fix a Submarine head that is not dispensing water
- Detach the head and check the reservoir.
- Fill the reservoir with cold, clean water to MAX.
- Inspect the snorkel for a blockage and remove visible debris without damaging the opening.
- Check the reservoir cap, snorkel direction and cassette seating using the steps above.
- Reattach the head and test it. Dyson notes that water may take a few moments to emerge after retesting.
If the reservoir is full but no water appears after a correctly assembled retest, do not add detergent or other chemicals to force flow. Escalate an unresolved no-flow condition to Dyson support, especially if an alert, crack or damaged component is present.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Clean a Submarine roller head after each use
- Switch off the vacuum and remove the wet head.
- Remove visible dirt and debris from the roller and head.
- Wash the parts using the Submarine cleaning instructions.
- Wipe components clean.
- Let the parts air-dry in a warm, well-ventilated space before reassembly or storage.
Do not get water on the neck connection. Keeping the roller head wet in a closed or poorly ventilated location makes it harder to tell whether a later dirty track comes from the floor, the roller or residual moisture in the head.
Cleaning products to avoid in Submarine
Submarine guidance cautions against bleach, high-foaming products and neat detergent in the tank. Use only the water and cleaning method specified for the exact head. A product that is acceptable for a separate roller-washing step is not automatically suitable for the reservoir, pump path or your floor finish.
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| What you see | If you own WashG1 | If you own Submarine |
|---|---|---|
| Streaks or a dirty-looking finish | Clean the roller, debris tray, sprung mangle and squeegee; rinse, dry and reinstall the roller; run Self-clean. | Clean the wet roller head after use, remove debris and allow it to air-dry; verify cassette seating and water-system assembly. |
| Poor pickup or debris left behind | Empty the debris tray and dirty-water tank, then inspect the four parts in Dyson’s poor-pickup checklist. | Remove debris from the roller head and waste-extraction area; confirm the cassette is fully clicked into its channel. |
| No water reaches the floor | Fill the clean-water tank and reseat it correctly. | Fill the reservoir to MAX with cold clean water, inspect the snorkel, and reseat the cassette; allow a few moments for water to emerge. |
| A small amount of water remains | Inspect the roller and squeegee and complete Self-clean; do not infer a roller failure from moisture alone. | Some water left behind is expected according to Dyson; distinguish a damp track from pooling or a leak. |
| Excess water or visible leaking | Empty and reseat both tanks, clean the waste path and run Self-clean; seek support if leaking continues. | Empty the waste-extraction tray, tighten the reservoir cap clockwise, point the snorkel down, and reseat the cassette until it clicks. |
| Roller appears worn | Replace about every six months or sooner if worn. | Dyson recommends replacing the Submarine roller about every six months, depending on use. |
Maintenance schedule that prevents repeat streaks
| Interval or trigger | WashG1 action | Submarine action |
|---|---|---|
| After each cleaning session | Empty the debris tray and dirty-water tank; use Self-clean as directed; rinse and dry tanks and tray. | Clean the wet head, empty remaining water and waste, and air-dry parts in a warm, ventilated area. |
| Whenever pickup drops | Inspect and clean the roller, debris tray, sprung mangle and squeegee. | Remove debris, inspect the roller and waste-extraction tray, and verify cassette seating. |
| Every six months | Replace the roller, or sooner if worn; soak the clean-tank filter mesh for one hour in citric acid or vinegar as the guide directs. | Consider replacing the wet roller about every six months, depending on frequency of use. |
| Whenever a tank or cassette is removed | Check that the tank is seated and clipped back in. | Secure the cap, orient the snorkel downward and slide the cassette until it clicks. |
When cleaning and reassembly have not solved the problem
Stop troubleshooting at home and contact Dyson support when the machine continues to leak after the relevant tank, cap, tray or cassette checks; displays an error or alert that does not clear; has a cracked tank, damaged cap, split seal or damaged electrical connection; or still will not dispense water after the reservoir is full and the snorkel and cassette are correctly assembled.
Have the exact machine name, vacuum model if using Submarine, the symptom, and the steps already completed available for support. Do not substitute a part based only on appearance. Dyson lists Submarine-specific components such as the water tank, clean-tank lid and snorkel, water-flow cover and tray; verify fit against the precise model before purchasing any replacement.
Common mistakes that make streaks and dirty water worse
- Using the wrong model’s instructions: WashG1 is a complete cleaner; Submarine is an attachment. Their tanks, cassette and cleaning procedures are not interchangeable.
- Replacing the roller before cleaning it: Dyson’s poor-pickup checklist starts with cleaning the roller and related parts. The six-month interval is maintenance guidance, not proof that every streak needs a new roller.
- Leaving waste in the machine: A full dirty-water tank or debris tray can undermine pickup and leave a visibly dirty track.
- Storing parts wet: Rinse, squeeze out excess water where instructed and dry thoroughly before judging the next cleaning result.
- Adding unapproved chemicals: Do not use bleach, high-foaming products or neat detergent in a Submarine tank. Keep WashG1 filter descaling separate from roller cleaning.
- Ignoring floor compatibility: Follow the flooring manufacturer’s instructions for water, detergents and drying time.
Final diagnosis
For WashG1, the highest-value repair path is mechanical cleaning first: empty the waste containers, clean the roller, debris tray, sprung mangle and squeegee, verify the clean-water tank is full and seated, run Self-clean, and dry everything thoroughly. Address the six-month roller and filter-maintenance intervals after those checks.
For Submarine, do not treat every damp track as a fault. Dyson says some water left behind is expected. Excess water or a leak calls for the waste-extraction tray, clockwise-tightened reservoir cap, downward-facing snorkel and fully clicked cassette; no water calls for a full cold-water reservoir, a clear snorkel and a correctly seated cassette. Persistent leaks, alerts or damaged parts require Dyson support rather than further chemical or assembly experiments.
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