Last Updated on October 26, 2026 by Umar Farooq
Will a dehumidifier turn back on after a power cut? Many modern ones do, but not all of them: it depends on whether your model has an auto-restart (power-outage memory) feature, and only the manual for that model can tell you. Nobody finds out until the house has been dark for a night and the machine is sitting there, perfectly cold, in a damp room.
The sensible habit is to find out on a dry afternoon, with you standing next to it, rather than on a Tuesday when you are three hundred miles away.
Which dehumidifiers restart on their own?
Some do and the makers say so. GE’s support page on power outages says its dehumidifier will automatically restart, in the settings last used, after the power is restored, under the heading of its Auto Restart feature.
Other owners report the opposite. In a Home Assistant community thread one user says basic dehumidifiers “pretty much all remember their previous state after a power outage”, while another notes that on their unit the bucketless setting does not persist if power is lost. Both are individual reports, not a survey, but they agree on the useful point: the answer varies by brand and by model, and sometimes by which setting you are asking about.
So I treat it as an unknown until proven. That is my one firm opinion on this topic: assume it will not restart until you have watched your own unit do it. If it does, you have lost nothing. If it does not, you have found out before a fortnight of damp did it for you.
Look for these words in the manual
Search the PDF (Ctrl+F is faster than reading) for any of these phrases:
| Phrase in the manual | What it usually means | What to do |
|---|---|---|
| Auto restart, auto-restart | The unit returns to its last settings when power comes back | Still test it once |
| Memory, last setting, power-failure memory | Same idea, different label | Still test it once |
| Power outage, power failure | The page may say it restarts, or say you must press the button | Read the whole entry |
| Nothing at all | Unknown, and quite possibly “no” | Test it, then assume the worst |
The last row is the common one. Manuals are good at telling you where the drain is and poor at telling you what the electronics do after a blackout. The timer function guide makes the same complaint: none of the manuals I opened for that article said what happens to a timer after a power cut, so I did not claim it.
Test your own unit in two minutes
Do this only with the unit upright, the lead undamaged and the socket dry. Pull the plug out by the plug body, never by the lead, and keep your hands dry. If the lead, plug or socket looks scorched or damp, stop and do not use the machine.
- Switch the machine on at your normal target humidity and let it run for a few minutes so the fan and compressor are both going.
- Note the settings on the display: target humidity, fan speed and any mode.
- Switch it off at the wall socket, or pull the plug as above, and count to ten. A real cut lasts longer, but the electronics only need to lose power.
- Switch the socket on again, or plug it back in, without touching the unit’s own buttons.
- Wait. The fan may start immediately, but the compressor is made to wait: every unit has a lockout of roughly three to five minutes after any stop, so give it ten before you judge.
If it comes back running on the same settings, it has power memory. If it sits dark or in standby until you press the button, you now know to check it after every outage.
What a restart can still forget
Even a unit that restarts may not remember everything. Check these three after your test:
- The target humidity. Confirm it matches what you set, not a factory default.
- The mode. The Home Assistant report above is a specific case: one setting came back, another did not. Continuous drain, laundry or turbo modes are the likeliest to reset, though I cannot tell you which models do.
- Any timer. Assume a countdown has gone, and look at the display when the power returns.
The settings guide already says to check that auto-restart is on, if your model has the option, so the machine comes back to your setting rather than sitting dark for weeks.
When it matters most: holidays and wet cellars
A power cut at home is a nuisance. A power cut while you are away is the case this test is for.
If the dehumidifier is protecting a cellar, a spare room full of drying clothes or a house you are leaving for a fortnight, it is worth knowing in advance whether it will cope. A machine that restarts on its own will pick up where it left off. A machine that does not will sit still while the damp builds, which is exactly the failure that a long absence invites.
A smart plug cannot always rescue a unit that needs a button press. It can only switch the power; it cannot press the button for you. That limit, and how to set one up safely, is covered in using a dehumidifier with a smart plug.
If you cannot confirm restart behaviour, ask a neighbour to look in, or open the internal doors and leave the house ventilated for the length of your absence. Neither is as good as a machine that comes back by itself, but both beat finding the house damp.
A dehumidifier that restarts is a feature to confirm, not to assume
After a cut, check the machine as you would check the freezer: a glance, once, at the display. If it is running on your settings, carry on. If it is dark, press the button and make a note that this model needs help.
FAQ
Will a dehumidifier turn back on after a power cut if it has a plug-in reset button?
Not necessarily. Some plugs with a test and reset button trip when the supply is interrupted and need pressing again before anything happens. That is normal after a power cut, not a fault in itself, so look at the plug as well as the machine.
Does a power cut damage a dehumidifier?
I did not find a manufacturer page saying an ordinary outage harms one, so I will not claim it either way. If a storm is forecast and you want to be cautious, unplugging it is a reasonable habit, but treat that as my judgement and not a rule I can source.
Why will my dehumidifier not turn on after the power came back?
Check the plug and socket first, then whether the tank is seated and not full, then whether the unit needs a button press because it has no auto restart. If the fan runs but nothing dries, give the compressor its lockout time before assuming a fault.
Do dehumidifier settings reset after a power outage?
Sometimes. A unit with power memory returns to its last settings, while one without it may revert to defaults or wait in standby. Individual reports suggest some special modes do not survive an outage, so check the target humidity and mode after a cut.
Can I leave a dehumidifier running while I am away?
Plenty of people do, but it is only a good idea if the unit has a drain hose so a full tank does not stop it, and if you know it restarts after a cut. Both are worth checking before you go.
