FAN Repair

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Introduction: FAN Repair

I had accumulated three floor standing fans which had stopped rotating. Had cleaned and oiled its shaft bearings and even changed the squarish capacitor but still not turning. Was about to throw them away when I thought "... what's the harm in dissecting them, I could learn something from it...!!"

I had asked a few servicemen and all I got was a short "...there's an internal thermal fuse...". I trawled the web for months but just could not find any info on where the fuse was and how to replace it. Finally I decided to sacrifice one of the fans and dissected all the wires going into the windings. 

From this came the schematics of the fan, but only up to the motor windings.

This instructable comes in 2 parts: (I)Troubleshooting and (II)Fuse replacement.

Step 1: Materials Required

Cross head screw driver
Flat tip screw driver
Scissors or Pen knife
Soldering Iron and some Solder
Some string about 0.5mm in diameter 
Spare wire, about 60cm long
Capacitor 1.4uF 450VAC (if required)
Thermal Fuse 130degree C, 1A, 250Vac
  (note: I could only find a 2A 130deg replacement @$1.50SGD a piece from the local electronic component shops. Sorry I don't have equivalent part number from Mouser, RS n Digikey)

Step 2: Troubleshooting

WARNING:
If you are NOT trained in electrical repair, please STOP here.
It would be wise to spend the money for a replacement fan and give the faulty one to someone who knows. We are dealing with 250VAC, so be extra careful. You proceed at your own risks.

The Schematics :
At this juncture, I assume you know and have verified that the timer and speed selector are working fine (i.e. voltages are present at output of the speed selector (grey, orange and red wires)), see schematics and picture.

The colors of the wiring used in my fan may be different from yours, so make a note.

Troubleshooting the Thermal Fuse :
1. Disconnect power to the fan.

2. Open up the control unit cover.

3. Take your time to trace the wiring and note down its color and location. It should be similar to the schematics above.

4. Using the spare wire, connect from point “A” to “B” to shunt the fuse. For my case, “A” was the blue “neutral” wire on the terminal block and “B”, the grey wire on the big squarish capacitor.

Once done, make sure your fan (without the blades of course) is resting properly and securely as we are going to power it up.

5. Connect and power up the fan motor. If the fuse is faulty, the motor will rotate, mine did. If it did not, it might also be that point “C” was used instead of “B”, since you could not know which terminal it was. No worry.

6. Disconnect power. Move point “C” to “B” and power up the fan again. If it still would not rotate, it’s likely the capacitor. 

7. Disconnect power and remove the spare wire.

Replacing the Capacitor:
1. Disconnect power.

2. De-solder (or cut) the wires at capacitor terminals and connect them to a new capacitor (same type).

3. Power up the fan. If the motor still refuses to rotate then I believe the problem is with the motor windings and it's time to say bye-bye to the fan.




Step 3: Thermal Fuse Replacement

Once the thermal fuse has been determined to be the cause, here we go...

Removing the Thermal Fuse:

Disconnect power to the fan before proceeding.

1. To make fuse replacement easier, we need to free the motor from the control unit keeping its wiring harness as long as possible. The harness has 5 wires going into the motor housing. By tracing this harness, starting from the motor housing, I found the Ground (green/yellow) and Neutral (blue) wires ending at a terminal block and another three (grey, orange, red) ending at the speed selector.

2. Remove the Ground and Neutral wire (no cutting required) from the terminal block. De-solder  the grey, orange and red wires at the speed selector, note their location first. (You may have noticed that I cut the whole harness about 10cm from the motor…big mistake...but that was way before I decided to do this!!)

3. Using a flat tip screw driver as a lever, pry the motor housing mount rod away from the control unit.

4. Remove the oscillating unit and detach the capacitor.

5. Remove the metal housing screws. Carefully remove the rotor and the windings slowly by giving it enough slack from the harness.

6. The windings are tied by strings and coated with some kind of lacquer. We need to cut some of them (see the “X” points in the picture) using pen-knife or sharp tip scissors. Look for a bulge (where the fuse is) and notice where it ends.

7. Carefully slice open the black sheath cover to expose the brown woven sheaths, also tied with strings.

8. Trace the blue Neutral wire from the harness towards the windings. You will notice it ended inside the biggest sheath which is on top. This is our target. Cut the strings tying this sheath.

9. This big sheath, which is flattened, holds the fuse and another sheathed wire. Use fingers to lift it and press on its sides to form back its tubular shape. 

10. With wriggle, press and pull action, slowly remove this sheath and the thermal fuse will be exposed. Put the removed sheath aside to be reused later.

11. Notice that one of the fuse’s leads is also sheathed to prevent electrical contact. Slice the SIDE of this sheath lengthwise about 10mm. Expose the lead through this cut.

12. With both leads exposed, cut them off as close to the fuse as possible. This will give us enough room to solder the new fuse.

13. Trim the leads of the new fuse to about 10mm and tin them with solder.

14. Solder the new fuse, polarity is not important but you may follow the old fuse direction.

15. Move the cut sleeve to cover back the lead exposed in step #11above.

16. Cover the fuse and its accompanying wire with the big sheath removed in step #10 above.

17. String the new fuse assembly to the windings as neat as you can. Fold back the black cover and string again. Ensure no string or black cover sheath is protruding into the rotor area.

18. Carefully place back the windings and rotor into the motor housing.

19. Secure the housing and mount back the oscillator and the capacitor.

20. Insert the motor housing mount rod to the control unit, a little pressure is needed here.

21. Dress back the wiring harness and reconnect the Ground and Neutral wires to the terminal block. (For me, I had to solder back all the wires and insulate them with heat shrinking tubes. I also had to de-activate the oscillator to prevent them from rubbing against each other)

23. Re-solder the grey, orange and red wires back to the speed selector.

24. Power on the fan to test. Cover back the control unit and you are done.





Step 4: Finally...

I did not use lacquer to protect the windings and its been operating for nearly 2 months now at around 6 hours a day.

To prevent overheating, I modified the timer to disable the permanent "ON" selection. By using the timing mechanism there will be resting time in between, when no one is in the room or no intention to use the fan for a while.


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    41 Discussions

    0
    leenardjhaz
    leenardjhaz

    2 months ago

    My orbit fan is rotating in about 1 minutes after dat stop I replaced the capacitor bat he stop rotating after 2 minutes what is the couse can't you help me to fix my orbit fan

    0
    r.sreeni
    r.sreeni

    4 months ago

    I have this stand fan that recently giving some problem. It has button switch speed control. The fan has power and works on speed 1 but whenever I change the speed or press the timer button, the fan turns off by itself. What could be the problem? Thanks in advance

    IMG-20200403-WA0019.jpgIMG-20200403-WA0018.jpgIMG_20200403_165051.jpgIMG_20200403_165016.jpg
    0
    vitha
    vitha

    Reply 2 months ago

    Please replace the two white capacitors. It will work

    0
    Hordun
    Hordun

    Question 4 months ago

    I dusteded my standing fan and I discovered it's not working properly again. The first thing I noticed was that, it take some time before picking up. When it's on, it make a sound but the blades won't roll. It will eventually roll but it takes some minutes. Though the minutes differs, it will still work. Last night I discovered it took some time to work (longer than expected), so I decided to check it out..it was too hot. So I decided to take it apart and I discovered there is a loose wire and I don't know where and how to fix it.

    15864320415881874657549.jpg15864320996241567707606.jpg1586432167315633378073.jpg
    0
    PereraK1
    PereraK1

    Question 6 months ago on Step 2

    when non operation system I can run the blade smoothly. when i given power and start to run by the first speed it is get stuvk without running.what can I do for this.

    0
    rolandrayos02222
    rolandrayos02222

    Answer 5 months ago

    If you help the blade by hand to turn and the fan start to run, there is a big possibility that you have a defective capacitor. You have to replace the capacitor. But if the fan does not run, you probably have a defective winding and needs a motor winding replacement.

    0
    CarleesMomma
    CarleesMomma

    Question 2 years ago

    On the fan motor, what is the white wire with an N on it for? Does the N make it different that any ordinary wire?

    0
    ByronH25
    ByronH25

    Answer 8 months ago

    Hi on my fan 2 blue

    0
    ByronH25
    ByronH25

    Reply 8 months ago

    Go to power 2 blue and red

    0
    mandatoryemails
    mandatoryemails

    Reply 9 months ago

    If you're talking about your own fan (I don't see any such wire in the photos), then it's probably the neutral wire in a 3-point plug system. But if you can't differentiate Neutral from Live then it's probably not a good idea to be attempting this instructable.

    0
    Artuino
    Artuino

    1 year ago

    I have a couple of these type of fan at home that I have dissected and common failure is the coil winding inside the motor between Mid and High selector get busted (become open connection). Common symptom of that is that the fan won't rotate but is just humming.

    0
    GeorgR
    GeorgR

    Reply 1 year ago

    Yeah, happens often. You need to be very careful when you pull out the axle and then back in. When it scrapes the wires, your fan is usually toast.

    0
    GeorgR
    GeorgR

    1 year ago

    With many cheap fans there is often wires from the winding protruding and *almost*
    touching the moving part of the axle. I have found the most common problem, aside from the fan sizing up after some time, is that when disassembling the motor (for maintenance, cleaning, new oil etc.) that you rip wires from the winding. You are correct (see 3) normally this means you need a new fan.

    I was just able to repair a fan where I knew it was the winding, so I didn't think I could fix this one. I found the ripped wire checking the entire winding with a loupe. I fixed it with: Good soldering iron, soldering paste, good solder and the thinnest 1mm heatshrink I had. The tiny wire ends thankfully were still close together to solder, then I put the heatshrink over the area and positioned the wire back in place where it was before roughly in line with the winding, and fixed the entire thing back with some string.

    0
    PeterD222
    PeterD222

    1 year ago

    Step 2: Troubleshooting shows a very nice schematic. Thanks for that. But the word "CONCEALED" is spelled with only one "L."

    0
    AllyM28
    AllyM28

    Question 1 year ago

    Does a standing fan automatically stop working if the timer stops working

    0
    LevittL
    LevittL

    Question 2 years ago on Introduction

    Do you happen to know or can recommend where i can purchase a fuse to replace the 5A 125V that even Home Depot doesn't have, nor does Fry's Electronics and Amazon may have, but I'm not sure of the size and looking at the specifications in Holmes manual or online-one anyway, doesn't contain the measurements to descirbe or for ordering purposes off Amazon, it would be better to know what I'm doing because i ordered the wrong one from Home Depot believing it was the actual 5A 125 V but first look it wasn't even little enough since this thing's so small and difficult to get out of that plug on the fan itself or at the end of the cable to plug in the wall (now) is, i guess the standard way of putting in fuses to avoid blowing, etc..

    At any rate, that's what I wanted to find if there's info. on how i can get info. maybe just by emailing them with the pursuit as I already did. Thanks.