Delonghi DEM10 Easy Diagnosis and Easy Repair

Bougnt on eBay for 99p as faulty on eBay, we take this Delonghi dehumidifer apart and diagnose a very common problem then fix it with a 50P component.

[@johnmerrett5186]

Same as many, no soldering skill, ordered part, swapped out and hey presto!! Blooming amazing, thx 👍😎🇬🇧 John

[@razenby]

Brilliant that has made my day!! Good job. Do me a favour and subscribe if you can. Thanks.

[@WozzaD79]

Ordered the part from eBay... Installed it and it worked! I got no soldering skills and had to buy one but it all works now. Thanks. 😊

[@razenby]

Fantastic. Great job and that is just what I want to hear. Thanks for watching.

[@MushyTales]

great video - I've never done soldering or electronics to this degree but just bought the part and a little soldering kit 🤞I don't explode ;) I'm assuming it's the same issue as I pulled it all apart and the fan goes but the compressor doesn't seem to do anything - the dehumidifier itself is also 9 years old and hasn't been used for 7 years but was used extensively before that - cheers again. Edit to add - my little soldering kit and the component arrived, and thanks to this video I swapped out the part (the board and parts were a bit different looking than this video but it was obvious which was the part that needed changing) and it fired up no problem at all and it's now busy drying out my car after getting damp over winter :D awesome, thanks very much

[@razenby]

Great job. Another one saved!! Please subscribe if you haven't already..

[@JohnTaylor-cu7id]

Great video! - thanks for uploading - you must have saved quite a few dehumidifiers from landfill 👏 The fault finding and explanation of the circuit board was very informative although I wasn’t confident to power up my board with 240v on the bench. My capacitor had almost an identical value to yours when it was removed and measured with a multimeter, like so many others l ordered a £3.98 replacement on-line and my dehumidifier is back up running better than ever 😊 Thanks again - much appreciated.

[@razenby]

Hi John Great to hear that yet another one has been saved by an intrepid owner. Mine is still going strong. Thanks for watching and subscribe if you can.

[@nicolasknittel9726]

Ordered a Mestek Multimeter and a Capacitor, changed the part, now dehumidifier is fixed! Thanks so much.

[@razenby]

Good luck with the job.

[@abdulrasheed4498]

Very useful video. I have Delonghi cooled condenser. It's suddenly stop working when I pushed standby. I don't know what's happening. No power, no lights on the screen. Can you please give me clue.

[@razenby]

Check out the controller and he tilt switch.

[@frankyjayhay]

Great video thanks! Had it for 10 years and only now found the air filter from the video. It was solid with dust. I took the front cover off as well and found a thin layer of dust on the fins too. I found if you don't need to repair the top panel you can slip a screwdriver under the sides of the handle without removing the panel or the handle. Most important, though, was to see where the coolant pipes were before opening it, damaging them while opening the case would be catastrophic.

[@razenby]

Nice work!

[@NoferTrunions]

Was there a humidity sensor? Or was the adjustment a duty cycle? or some kind of coil temp sensor?

[@razenby]

Yes there is a humidity sensor. The fan powers up from time to time to check the humidity. If higher than the set point it runs the compressor.

[@abdulrasheed4498]

Thank you for your reply. But the machine didn't started even if I push the on/off button on the machine it self?

[@razenby]

The most likely cause of your problem is detailed in the video.

[@MrScififan]

Thank you for making this video. I have the same Dehumidifier - was working fine all last year and need it again now and same problem. Fan comes on but compressor won't turn on. Found an equivalent capacitor from RS components so hopefully that will sort it once I swap it out. Thank you again!

[@razenby]

I am pleased you found it useful. Another thing saved from Land fill. Good luck.

[@MrScififan]

@@razenby Switched out the cap, and working like new again - £2 from RS - very pleased

[@razenby]

@@MrScififan Great news, Good job. I find that very satisfying and it wasn't even me!!

[@nickanderson3834]

Wondered where I could buy a comparable replacement drop capacitor component also can they be soldered in either way round or do they have a positive and negative polarity. Many thanks

[@razenby]

The film capacitors do not have a polarity. They work just as well either way. There are plenty of suitable capacitors for sale on eBay.

[@jasminep4676]

Hiya great video! i have the same unit, always ran fine and still does but the fan has a sort of scratchy sound it didn't have before - do you reckon its a case of dust build up (likely - in house reno!) or something else that needs to be fixed?

[@razenby]

The removable filter should take care of the dust.... Maybe the fan bearings need a drop of oil??

[@johnclark1731]

Very useful video. I have a DeLonghi dehumidifier with a pump, to pump the condensate up against gravity, and it has the same symptoms. The fan runs but the compressor doesn't. I'm inspired by your video to troubleshoot the controller. I'm an electrical engineer with alot of analog circuit design experience, so I have no qualms about probing around the PCB to find the problem. Thank you very much for your video. The "autopsy" of the capacitor was very interesting. It's kind of interesting because I just repaired my A/C condenser unit, which had a failed dual startup capacitor. It should have been 45 uF & 7.5 uF, but both capacitors measured virtually no capacitance. The top end of the cylindrical capacitor was very corroded. My son and I located and purchased a new 45 uF + 7.5 uF capacitor today. We took a picture of the old capacitor, showing the wires connected to it and then disconnected and removed it. Then we installed the new capacitor. After putting the covers back on the condenser unit, we applied power and set the thermostat to Cool. The compressor and fan came on and the A/C system cooled the house down gradually.

[@razenby]

Check the starter thermistor / switch on the compressor. A very common failure.

[@johnclark1731]

I checked the compressor thermistor switch. It was open. I bypassed the switch and then turned the dehumidifier on. It ran for about 10-20 seconds and then the basement circuit breaker popped. I tried it twice with the same result. After the second time I touched the side of the compressor and practically burned my finger!!! Before I turned the dehumidifier on, I measured the resistance of the compressor. It was 2.6 Ohms. I figured that was too low and that the compressor would draw too much current. Since the compressor is bad, I guess I'll buy another dehumidifier. Thanks for your help. Earlier today, I was thinking that maybe the compressor was just low on refrigerant. But now it seems like it has failed. Do you agree?

[@tommallender3217]

Can’t believe this actually fixed my dehumidifier! Brilliant!

[@razenby]

Good job.

[@skedwin3020]

The compressor kicks in when i have it on the dial and on the mains, but if i switch it off on the dehumidifier dial and back on only the fan comes on, and ideas?

[@razenby]

The dial is a humidity or dryness of the air setting. If it is working properly when the set humidity is reached (or you turn down the control) the compressor stops first and after a while the motor stops too. If you turn the power off and back on there is a delay turning the compressor on. The delay is to allow the high pressure side of the pump to lose pressure (equalization of pressure on both sides of the pump). If you switch the pump on with full pressure on the high side it will not start as the torque will be too low. That is why.

[@WozzaD79]

I have no power to the compressor. Would your video fix this

[@razenby]

It is one of the causes perhaps the main cause...

[@WozzaD79]

@@razenby many thanks for your swift reply. Appreciated

[@daverich3352]

Impressive skills. I have one of these which is playing up, it's producing water, but the switching seems to be faulty, the fan keeps starting up for about 1 second then stops, then starts again briefly then stops. It used to just run a normal cycle for 10mins then stop for a while and repeat. Prior to this problem one of the switch noises was getting louder, maybe it's a micro switch which has gone.

[@razenby]

Check/replace the capacitor featured int the video - you have the classic symptoms of a failing voltage dropping capacitor!!!

[@daverich3352]

@@razenby I tried replacing the yellow capacitor, (the old one was 0.73uF, the new one 0.98uF) and took measurements like in your video, however I'm only getting 6.6 DCV on the large resistor. I tried measuring the ACV on either end of the yellow capacitor one end was 240 ACV, the other 30 ACV. I also only get 6.7 DCV at one end of the yellow capacitor. Needless to say the dehumidifier is not activating, I get a green light on the control panel when I turn the dial, but nothing else. It's interesting trying this out, however I'm heading towards buying a new board I think.

[@craiglongden6984]

Got the same problem with exactly the same one fan running and compressor not kicking in. Can you recommend where you get the capacitor from? Thanks

[@razenby]

Almost anywhere. Send me a picture of the cap you suspect and I'll have a look. [e-mail]

[@saarike]

Excellent video and interesting information! Thank you Magic Smoke.

[@razenby]

Glad you enjoyed it!

[@saarike]

@@razenby You're well come Mr Magic Smoke. Huh, yesterday i decided to clean my pc and i srayed some contact cleaner to prosessors cooler (No power of course) and i waited about 30 min that that liquid evaporates away, but when i tried to start pc => black screen. So i sprayed so alcohol to remove residues and i waited to this day and for my pleasure it started again. I never ever spray that liquid to pc. Glad no magic smoke appeared 😉. 👍

[@saarike]

Correction to last words. Failure wasn't caused by contact cleaner. It was a poor contact to prosessors power supply (12V line feed). I tighten it up and now pc works like a charm. 👍

[@steveswan5714]

Hi thank you for the post 👍 i hopefully have the same fault, fan runs but no compressor, capacitor tested at 265nf couldn't find one on ebay and they usually have everything ? Could you tell me where to get one please

[@razenby]

No worries. Just use this search term in eBay; "0.01uF to 2.2uF 310VAC X2 Metallised Polypropylene Film Capacitor" Choose 1uF version, 275VAC or higher working, X2 rated,

[@tricky512010]

I have an orange flashing light low temp pause mode the compressor is ok filter is clean which comonent on the main board controls this mode?

[@daverich3352]

The sensor attached to the coils determine if the dehumidifier is icing up, it then just runs the fan for a while to try to defrost it.

[@razenby]

Is that true??...-- Cant find any sensor on mine.

[@tigra8559]

Great info man! Am about to de assemble mine as it needs a good clean up plus an electric smell that comes from it so good luck to me lol.

[@razenby]

Good luck.. Let me know how it goes. remember to let it stand upright for a while before you turn it on.

[@tigra8559]

@@razenby now doesn't seem to collect water.. :(

[@andywellman3227]

Got the same issue with my DEM10 but the circuit looks slightly different any help would be greatly appreciated as I'm unsure which component to change

[@razenby]

Send me a photo and I'll point it out. [e-mail]

[@andywellman3227]

@@razenby thank you..I've emailed you some pics

[@tommyhanlon8012]

Hello again Mr.Magic, i have the same symptoms with that model. So what i need is a ..................... ''1 uF 250 volt AC poly Cap'' was looking at them on R.S., does it matter if i get 'PP' or 'PET' ? & there's no 'start' or 'run' options like a bigger cap so i assume there's no duty cycle requirement ? & it's the AC spec that's important for that pcb ? as most cap options seem to be dual AC & higher DC applications. is there a best brand from what you implied in the vid, RS offer: kemet-Vashay-genteq-panasonic-epcos, is it higher price is better ? (i enjoy doing a job, but i just want to do it once!) so any brand recommendations ? Please forgive my obvious lack of knowledge re electronics & i hope it's not too cold out there as i'm sure you're outside making them XT vids as we speak ! :)

[@razenby]

You need a 1uF 275V AC X1 or X2 rated cap. See this page anyone will do Epcos or Panasonic are good: uk.rs-online.com/web/c/passive-components/capacitors/polyester-film-capacitors/?searchTerm=1uf%20250v%20x1%20capacitor&applied-dimensions=4294466083

[@tommyhanlon8012]

@@razenby Thanks again Mr.Magic, i'll order from RS Dublin. We have 220 v ac line in over here, i assume a rated 275 v cap is ok, as i remember hearing with caps you can go up in voltage & capacitance but never down. Thanks for sharing your Knowledge, it's very decent of You to give me Your time, & is also very much appreciated. Stay Safe.

[@razenby]

@@tommyhanlon8012 You are very welcome. I love saving stuff. Just check the physical size of the caps on the datasheet to make sure the lead-pitch and case will fit on the board. 275V or 250VAC rating caps will both do. Some of the very high quality caps are quite a bit bigger.

[@tommyhanlon8012]

@@razenby as do i enjoy so much repairing & saving stuff whether it be mechanical or electrical & more, & the pleasure of figuring out & learning something new & hopefully understanding what i can. So many people just miss out on that & just don't get it.

[@gianlucarenzi7706]

Good job indeed! I own the same dem10 but I clearly feel the compressor is getting hot, so I suppose it is driven from the printed circuit board, but no water... I am worried about the gas or a non working compressor. What can be the culprit?

[@razenby]

If the compressor is hot but not turning could it be the starting switch or motor capacitor?

[@gianlucarenzi7706]

@@razenby If with the word "turning" you mean the activation of the compressor, the answer is: yes the compressor is somehow shaking, at least it seems to be running as always. But after some time (let's say 120 minutes) it became hot, and no water at all in the tank. That's I suppose the lack of the gas (R134a) or a non-working compressor. 😞

[@maryseviaux3454]

Hi,I have the same model,and just noticed, it stopped working .The green light is on but the fan isn't turning as it should. I can notice a lot of dust on it,could it be the reason?I prefer to get your suggestion as the probable cause of the problem ,before trying to dismantle the machine. Thank you in advance

[@razenby]

I can't say for sure. If the compressor wont run then the fan wont run. What does the display say? Is it alight? Does it display a valid temperature?

[@nigeledwards35]

Hi, Your excellent video spurred me on to try and get my little used dehumidifier working. I am no electrician but ordered and fitted a new PCB board. After about an hour there is no heat emerging and no water - this in a damp area. I have no skill to test other items and do not wish to throw more £'s at it. Would be grateful for any suggestions, I think it is too good to throw on the tip, little use and not even any dust inside! Should have said it is same model DEM10 . . . . .

[@razenby]

Ahh that's a shame. Obviously make sure that the plugs are all in. Inspect the connector are in correctly and they look good and no wires have poked out. Does it react when you pull out the water tray? I have never seen one with a bad compressor but there is always a first time. Are both the fan and compressor running? If the compressor is running (some vibration of the compressor unit) you can check if there is gas cycling within by feeling around the output pipe of the compressor. It should be warm. Again if the compressor is running one side of the heat exchanger should be very cold. If you cant feel the warmth or the coldness in the pipes and the compressor is running then it has leaked out the refrigerant or the pump has failed in some way. Where do you live?

[@nigeledwards35]

@@razenby Thank you for your rapid responce-much appreciated. I had just checked again, took out the container and it was warm inside but no heat from grills! My theory is. . Because it is stored, in its box, but on its side perhaps the refridgerant has leaked out? I will check your helpful tips re the compressor before (reluctantly) the 'tip claims it. Such a shame-when it worked it was a great piece of kit.Thanks again

[@razenby]

@@nigeledwards35 Needs to stand upright for a few hours. Is the compressor running?

[@razenby]

@@nigeledwards35 Also it could be a faulty humidity sensor. If you can safely meter the compressor drive AC mains voltage and there is power then it should be running.

[@nigeledwards35]

@@razenby Again Thanks. Sadly I'm not comfortable with 230v and though I have a meter in the caravan not adept with it's use! I will try your previous 'diognostic' and report back conclusions later (few days). You are a star and love your videos. Regards

[@jamesmoylan2861]

Sorry would you know when they started making the Dem 10 approximately if not no worries thanks very much enjoy videos very helpful

[@razenby]

Sorry I don't. I do know there are variants that look exactly the same but have different rating compressors and water capacity.

[@jamesmoylan2861]

@@razenby Thanks very much, Great videos cheers.

[@Russ1007]

Hi, I had a lot of smoke coming out of mine and have taken the back off and seems to be the cap as it is melted on outside, I havnt got a clue about this this type of job, can I replace the whole board as I don't want to be soldering, any advice would be much appreciated

[@razenby]

But a soldering iron and a 9OP capacitor and get soldering and save the planet...

[@razenby]

Send the controller to me and Ill fix it for you

[@Russ1007]

@@razenby got sorted mate, running like new, thanks for the advice and video, saved me a good few quid 👍

[@razenby]

@@Russ1007 Good job

[@chakeryammine2122]

Hello sir just how much does this item that you changed cost?

[@razenby]

About $4

[@Rose-vu2dv]

Hiya tank is broken where can I get spare parts?

[@razenby]

I dont think you can get. beware there are two designs of tank for what appears to be this model. A bigger volume one and a smaller one. Both look identical but they are not interchangeable. If you have all the parts of the tank , you can bond it with a solvent adhesive. If it is just cracked you can seal it with silicone adhesive,. The stuff designed for fish tanks works best. They all seem to be cracked. I think they are just normal acrylic plastic. It is shame they didn't make them from Polycarbonate.

[@maryseviaux1858]

I've got two of them, but if one has a very low noise level,the other one though hasn't. I have tried to clean the fan unsuccessfully.What could be done to try to fix the problem please? Thanks in advance for your assistance

[@razenby]

There are 2 versions that look the same from the outside. The older one has a larger round compressor and run quietly. The newer version has a smaller rectangular compressor that makes a lot more noise. You can easily check If you have this issue as the water trays are a different shape and are not interchangeable. Run side by side in the same room the older unit with the large compressor will collect a lot more water (at least twice as much). It is unclear if the newer ones ever performed as well as the old. My gut feeling is that they are inferior. I have seen 2 of these newer units and both were noisy and less effective especially at lower ambient air temperature (6 to 10 degrees). If the compressor is running and the pipes get cold then you have a compressor failure or refrigerant gas gas has escaped and you will need to replace the compressor or get it reg-gassed.

[@maryseviaux1858]

@@razenby Now that you mention it, there's indeed a difference in the water trays and I do recall the larger one is the newest model. I will confirm it's performance is way inferior to the one I purchased first , not only by it's annoying noise but by it's poor capacity to absorb humidity. Appreciate not only your answer but your good review as well.

[@razenby]

@@maryseviaux1858Keep me posted thanks.

[@briancharles3438]

I think you’re correct about them caps being crap for a reason, anything nowadays that’s potted always makes me go hmmmm. Enjoyed that one cheers blue...

[@razenby]

I agree... they are too small for the voltage to be taken seriously.. They are supposed to fail open so at least they git that bit right!

[@marwan27031952]

MeacoDry ABC Dehumidifier in white ABC10LW, not collecting water, can you help

[@razenby]

Sorry I don't know that one.

[@vergalhudo]

I got exactly the same problem in my dehumidifier, how far are you from Manchester? Thanks in advance

[@razenby]

Too Far. Time to buy a soldering iron Change the capacitor...

[@buingocthinh87]

Mine is only run with 170~180w max by 220V AC, did it lack of R134 gas, bro?

[@razenby]

I have two versions of this Dehumidifier. I don't' know if they were ever on sale concurrently. One is about 150W and has a small compressor and does not work well.It is pretty effective in high humidity (>90%) warm room situations. Put side by side the ~500W collects water at a much higher rate. The low power version is probably more efficient when the dew point is high but lacks the refrigeration ooompff for cooler situations. What is the power rating on your product label?

[@nomic1012]

if i may ask, mine turn off and on by itself, the whole unit not just the compressor or fan. do you have a clue what it might be please?

[@razenby]

yes, probably the same problem as you see here. they work intermittently when the capacitor is failing.

[@nomic1012]

@@razenby i think i found the culprit. there is a component labeled p-ic1 that has been burning or overheating as the pcb is discollored

[@vergalhudo]

I got the same dehumidifier, but I think it no working properly, the fun works , the compressor works but the dehumidifier just works for about 4 minutes and stops... Do you know what's the reason for that ? Thanks in advance

[@razenby]

Yes probably the capacitor I changed in the video is in the process of failing...

[@YasirAli-zw5cl]

Hi I really like that same model I get it last 5 years in my used ! But I hv same problm fan it working but take take water at all last few week can u help me to chek and repair it thanks regard

[@razenby]

Probably just needs the heat-exchanger cleaning out. One of mine was blocked with fluff. I removed with a tooth brush and an airline.

[@Westcoastprojects995]

I need a new switch board for my dehumidifier where can I buy one

[@razenby]

Not sure. Are they listed on eBay or you could phone the Delonghi service line and ask,

[@andykoops3213]

Just got the dead dehumidifier out of the garage and ran same tests as you. My pcb is exactly the same. So off to buy a 1mf cap. It did make me think of the two other devices that won't work as they are power controlled by a capacitor

[@razenby]

Well worth checking. The caps are just to cheap.

[@andykoops3213]

I tested my compressor by connecting to fan 240v spade. What would the downside of having both fan and comp piggybacked?

[@razenby]

@@andykoops3213 Icing up. Too much power consumed. No humidity control.

[@andykoops3213]

Caps arrived today. Fixed in 10 minutes

[@andykoops3213]

I spent over £100 on a new one. now for £2 +pp I've got another

[@simonharris5017]

Great Video, my DES-12 has a more recent and compact board, but the same fault! Hope the 630v 474J I sourced will prove to be a reliable swap for the original 22mm pitch 400v 474K that seems to be made from Unobtanium LOL. www.feb25.com/Public/ForumPics/IMG_6647.jpg

[@razenby]

Good job. Should be class X1 or X2 cap ( self healing)

[@simonharris5017]

@@razenby This is what came out, there's not a huge amount of space in the casing, hence the ugly alignment of my replacement. www.feb25.com/Public/ForumPics/IMG_6648.jpg

[@razenby]

@@simonharris5017 The type that fails isn't always the best type to put back...... Fit and forget...