My portable air conditioner is leaking water
Home Nura guide — category: Smart Portable Air Conditioners
Diagnosis
A portable air conditioner that leaks water is usually not level, has a full condensate tank or has a poorly connected drain hose. Turn it off, unplug it and make sure it's level, then check the tank and the drain hose before you look for anything else.
Possible causes
- Full condensate tank — water overflows at the base, especially in humid weather, and the unit may show a tank-full alert.
- Unit tilted or on an uneven floor — water collects on one side and runs outside the collection area.
- Drain hose kinked, clogged or loosely attached — water sits in the hose, then drips at the connector or from the bottom of the unit.
- Dirty filter or blocked intake grille — the evaporator coil ices up and then thaws, producing more water than the tank can handle.
- Drain plug or seal put back incorrectly — a steady leak appears at the bottom of the housing after manual draining.
What to do
- 1Turn the unit off, unplug it and wipe up the floor so no one slips and no water is near the plug.
- 2Stand the unit upright on a level floor with clear space around it, and make sure it wasn't laid on its side during transport.
- 3Empty the condensate tank through the drain plug with a container underneath, then put the plug and its seal back correctly.
- 4Check the drain hose: no kinks, a steady downward slope, a connector pushed on firmly and an outlet that leads to a suitable drain.
- 5Wash the filter in lukewarm water, let it dry, put it back and clear the dust from the intake grilles.
- 6Run the unit for a short time and watch the floor; if water comes back, note where it's coming from before you contact customer support.
Repair or replace?
If water comes from inside the unit while the tank, hose, filter and setup are all correct, an internal circuit or seal fault is likely and can't be fixed at home. On an older unit, replacing it usually costs less than a service call.
If you're replacing it
Smart Portable Air Conditioners: the picks from our buying guide
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Best overall
Midea PortaSplit
A 3.5 kW (about 12,000 BTU) portable split you can install yourself, no HVAC tech needed: the compressor sits outside, it runs at 39 dB(A) indoors in silent mode, it's rated A++ on the EU energy label and it heats too.
Photo: © Midea
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Best value
Midea Silent Cool 26 Pro WF
A 2.6 kW (about 9,000 BTU) all-in-one portable AC, class A on the EU label (EER 2.6), for rooms up to 335 sq ft (31 m²), quiet for its type, with an app, Alexa, Google Assistant and a Follow Me sensor.
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Best for large rooms
Trotec PAC 3910 X WiFi
14,000 BTU (4.1 kW) for rooms up to 560 sq ft (52 m²), class A on the EU label, Wi-Fi app control, a night mode and a Follow Me function.
Photo: © Trotec
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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.
- Smart Portable Air ConditionersMy portable air conditioner isn't cooling the room anymore
- Smart Portable Air ConditionersThe exhaust hose on my portable AC heats up the room instead of venting outside
- Smart Portable Air ConditionersThe compressor on my portable AC cuts out and restarts every two minutes
- Smart Portable Air ConditionersThe remote control for my smart portable AC has stopped working entirely
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 Smart Portable Air Conditioners 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.