Results 1 to 18 of 18
  1. #1
    Join Date
    Sep 2005
    Location
    South West
    Age
    50
    Posts
    129
    Rep Power
    19

    Fujitsu strange Whistling noise



    I wonder if anyone has had any experience of this?

    I have been contacted this weekend by a customer that we installed a 5kw Fujitsu WM inverter for last summer.
    His exact description is a strange high pitched whistling noise coming from the outdoor unit both when the system is running and when off. The system itself is working fine ,just seems to be producing this strange noise. I am going to pop in on wednesday to investigate but wondered if any of you had come accross this before??

    Many thanks

    Gareth



  2. #2
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    It is probably faulty electrolytic condenser of power inverter.

  3. #3
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    76
    Posts
    11,192
    Rep Power
    60

    Re: Fujitsu strange Whistling noise

    Or, is it the sound of gas passing through a restrictor of some sort?
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  4. #4
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    Quote Originally Posted by Brian_UK View Post
    Or, is it the sound of gas passing through a restrictor of some sort?
    If AC doesn't cool or heat, then there is no flow of refrigerant.

  5. #5
    Join Date
    Sep 2005
    Location
    South West
    Age
    50
    Posts
    129
    Rep Power
    19

    Re: Fujitsu strange Whistling noise

    Apparently all is working fine so i dont expect a leak. This is a constant whistle noise so i am thinking it may be electrical??
    Thanks

  6. #6
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    76
    Posts
    11,192
    Rep Power
    60

    Re: Fujitsu strange Whistling noise

    Quote Originally Posted by nike123 View Post
    If AC doesn't cool or heat, then there is no flow of refrigerant.
    But it could be equalizing
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  7. #7
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    Quote Originally Posted by Brian_UK View Post
    But it could be equalizing
    Of course that it could be!

  8. #8
    Join Date
    Jul 2007
    Location
    Australia
    Age
    50
    Posts
    1,855
    Rep Power
    20

    Re: Fujitsu strange Whistling noise

    If it happens when the unit isn't running, it's usually the inverter power filter board or capacitors.

  9. #9
    Join Date
    Jun 2006
    Location
    USA
    Posts
    204
    Rep Power
    18

    Re: Fujitsu strange Whistling noise

    Does the noise stop when you shut off the mains? Magnetic cores, such as in switching power supplies can vibrate at their operating frequency. This happens when windings and core are not cemented in place during manufacturing. These assemblies are typically dipped or doped to prevent motion. Ceramic capacitors can also make noise in switch mode supplies.

  10. #10
    Join Date
    Feb 2008
    Location
    stevenage england chav central
    Age
    51
    Posts
    44
    Rep Power
    0

    Re: Fujitsu strange Whistling noise

    hello mate i would check inside the condenser as it sounds like its coming from there but maybe it might be the condenser fan motor is it the same pitch all the time? does it change in heating mode ? ive had a few fan motors on dakin inverter units making a whistling noise changed the fan motor and it stopped freaky
    declan

  11. #11
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    Quote Originally Posted by declan simmonds View Post
    hello mate i would check inside the condenser as it sounds like its coming from there but maybe it might be the condenser fan motor is it the same pitch all the time? does it change in heating mode ? ive had a few fan motors on dakin inverter units making a whistling noise changed the fan motor and it stopped freaky
    declan
    Hi, Declan

    If you read carefully first post, you maybe found this sentence very interesting:

    His exact description is a strange high pitched whistling noise coming from the outdoor unit both when the system is running and when off.
    So, where is the connection between fan noise and supposed fact (supposed because that is customer words) that this noise is heard when system is off?

  12. #12
    Join Date
    Feb 2008
    Location
    stevenage england chav central
    Age
    51
    Posts
    44
    Rep Power
    0

    Re: Fujitsu strange Whistling noise

    oh in that case it must be the power inverter board humming duh ill get me coat

  13. #13
    Join Date
    Sep 2005
    Location
    UK
    Posts
    33
    Rep Power
    0

    Re: Fujitsu strange Whistling noise

    Hi Guys
    You have noise wether running or not & the unit runs ok. Maybe it's the wind whistling through the condenser.

    Frostycold

  14. #14
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    Quote Originally Posted by Frostycold View Post
    Hi Guys
    You have noise wether running or not & the unit runs ok. Maybe it's the wind whistling through the condenser.

    Frostycold
    What if day is without wind?

  15. #15
    Join Date
    Sep 2007
    Location
    England
    Posts
    54
    Rep Power
    17

    Re: Fujitsu strange Whistling noise

    Hi pal

    Iv had the same thing,Mine was a tiny hole on top of the compressor check that. but it could also be equalizing.

  16. #16
    Join Date
    Dec 2006
    Location
    London & Surrounding Counties
    Posts
    122
    Rep Power
    18

    Re: Fujitsu strange Whistling noise

    Im pretty convinced this is just the perfectly normal operating sound related to an inverter drive. "It's a high pitched noise"........yeah that's the noise inverters make. "It's running perfectly-yeah that's because it's not broken".

    I fitted one last year, and was quite suprised at how noisy the Fujitsu's were on full song when. There a vast improvement on a fixed speed system in terms of noise emmission, but they still leave a lot to be desired especially if fitted in residential environments. That whining noise will do your head in.

    Theres no easier way (as someones suggested) than to isolate the supply to the outdoor unit-it should fade out over 20 seconds say.

    Finally-tell the client to stop there winging and pay the call out

    Tell us what your findings were hey?...............
    Last edited by Daikin=Overated; 26-03-2008 at 09:27 PM.

  17. #17
    Join Date
    Sep 2007
    Location
    Split Croatia
    Age
    57
    Posts
    6,175
    Blog Entries
    6
    Rep Power
    36

    Re: Fujitsu strange Whistling noise

    Guys, read the description of problem more carefully. Half of these post would not existed if the original post is carefully read.

  18. #18
    Join Date
    Sep 2005
    Location
    South West
    Age
    50
    Posts
    129
    Rep Power
    19

    Re: Fujitsu strange Whistling noise

    Well guys, thanks for all your help.
    Attended the site today to investigate the whistling noise and guess.. No noise what so ever. Ran the system in heating and cooling running absolutely fine. Switched off and still no noise.....
    Bloody customers!!!!!!
    All temps are fine and run amps etc.

    I'm so glad i drove all the way to that one!!!!!
    Thanks anyway.

Similar Threads

  1. TXV Whistling
    By Myrmydon in forum Trouble Shooting
    Replies: 8
    Last Post: 07-09-2011, 03:27 PM
  2. Hermetic strange sound.
    By fridg in forum Technical Speculations
    Replies: 16
    Last Post: 02-03-2008, 08:08 PM
  3. Noise Level
    By Cewek ITS in forum Technical Speculations
    Replies: 4
    Last Post: 20-09-2007, 01:47 AM
  4. Fujitsu or not?
    By LRAC in forum Air Conditioning
    Replies: 14
    Last Post: 29-08-2007, 09:45 AM
  5. Any Ideas? Worrying noise from Fujitsu ASY 30E
    By MrThin in forum Air Conditioning
    Replies: 9
    Last Post: 29-06-2006, 11:45 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •