My wet-dry vacuum smells like dirty water
Home Nura guide — category: Robot Vacuum & Mop Combos
Diagnosis
This symptom isn't trivial, but in most cases you can fix it without calling in a pro. Work through the steps below in order and stop as soon as the problem clears up.
What to do
1. Unplug it and let it cool. 2. Inspect the parts you can reach. 3. Follow the manufacturer's procedure (owner's manual or official website). 4. If the fix means taking the unit apart, stop and contact customer support so you don't put the warranty at risk.
Repair or replace?
If the problem is still there after these checks and the appliance is out of warranty, weigh the repair estimate against the cost of a new model.
If you're replacing it
Robot Vacuum & Mop Combos: the picks from our buying guide
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Best overall
Dreame X50 Ultra Complete
A claimed 20,000 Pa of suction, an extending mop and side brush, 175°F (80°C) mop washing, and it climbs thresholds up to 2.4 in (6 cm).
Photo: © Dreame
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Best value
Dreame L40 Ultra
A full dock with 150°F (65°C) mop washing, warm-air drying and an extending mop, at a more affordable tier.
Photo: © Dreame
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Best for large hard floors
Roborock Qrevo Curv 2 Flow
Its SpiraFlow roller is fed clean water and scraped continuously, effective on sticky spills; it also supports Matter.
Photo: © Roborock
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Other common problems in this category
These issues affect the same type of appliance — each one comes with a diagnosis and the steps to take.
- Robot Vacuum & Mop CombosMy wet-dry vacuum stopped wetting the mop pad
- Robot Vacuum & Mop CombosThe brush roller on my wet-dry vacuum stopped spinning
- Robot Vacuum & Mop CombosMy wet-dry vacuum leaves white streaks on tile floors
- Robot Vacuum & Mop CombosThe clean water tank on my wet-dry vacuum leaks while it's docked
Frequently asked questions
Check the manufacturer's warranty first: how long it lasts and what it covers vary by brand and model, so read the terms for yours and keep your proof of purchase. If you bought it new in the EU, a two-year legal guarantee also applies (Directive (EU) 2019/771), covering defects present at delivery, whenever they first show up.
If you're still within the seller's return window, a return or exchange is usually the fastest fix. After that, go through the manufacturer's support team: it handles warranty claims and can often repair the unit even after the warranty has run out. Either way, keep your proof of purchase.
Our public methodology lowers the Nura Score /10 of any model in our Robot Vacuum & Mop Combos guide whose recurring failures show up in owner reviews. A model that breaks down too often never makes it to the top, whatever the brand.
Generally, yes, if you stick to routine maintenance: cleaning, replacing a gasket, recalibrating. Irreversible changes to the hardware are what can cause problems, so read your warranty terms before you open anything up. Anything the manufacturer's manual walks you through is the safe zone.
Your proof of purchase, the exact model name and a record of the symptom: photos, a short video, the sound it makes and any error code. Note when the problem started and what you've already tried. With all that in hand, support can pin down the problem much faster.