My window cleaning robot is losing suction and sliding down the glass
Home Nura guide — category: Window Cleaning Robots
Diagnosis
Warning: this symptom can point to a serious hardware defect. Stop using the device until you know the cause. We recommend contacting the manufacturer or an authorized repair service before you try to use it again.
What to do
Unplug it right away and stop using it. Document the symptom (photos, video, the sounds it makes), then contact the manufacturer's support team. Keep your proof of purchase handy: any warranty claim starts there.
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
Window Cleaning Robots: the picks from our buying guide
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Best overall
Ecovacs Winbot W2 Omni
Portable battery station, self-winding safety cable, three-nozzle spraying and edge detection for frameless glass.
Photo: © ECOVACS
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Best value
Cecotec Conga WinDroid 1090 Double Spray Connected
Dual spray, 8 modes, app and remote control, a safety rope and a backup battery that lasts roughly 30 minutes in a power outage.
Photo: © Cecotec
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Best for frameless glass
Hobot 2S
Compact and light, two ultrasonic nozzles, edge sensor, a 15 ft (4.5 m) safety rope and a backup battery that lasts up to 20 minutes.
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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.
- Window Cleaning RobotsMy window cleaning robot keeps losing its grip and almost falls
- Window Cleaning RobotsMy window cleaning robot leaves streaks after every pass
- Window Cleaning RobotsMy window cleaning robot beeps nonstop and says suction is low
- Window Cleaning RobotsMy window cleaning robot leaves a streak down the middle of the glass on every pass
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 Window Cleaning Robots 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.