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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorPeter61
    • CommentTimeMar 4th 2021
    My neighbour has a Mitsubishi Ecodan ASHP that has become noisy over the past year 2020, it was installed about seven years ago. The machine now admits a penetrating droning sound that reverberates through the air and can be heard some distance away, at least thirty metres. Importantly the sound cannot be heard when the fan is working harder during very cold weather, when the ASHP operates quietly. He tells me that he has had it serviced and nothing else he can do. Although it's is obvious it has developed a fault!

    The location of pump doesn't disturb his family but it has now made my garden impossible to relax in and the droning noise drives us indoors. This winter the unit has run all day every day and in summer it is on about three hours two or three times a day and then at night, somedays it runs all day, even Summer.

    I dont want to go to the council but would prefer to work with my neighbour who at the moment is not motivated to do anything about it. Is there anybody on this forum who has the expertise to advise me what could cause this noise. Its very hard to describe other than a droning sound that carries, but it happens when tempratures above about 5 degrees. Thank you for any advice I can take to my neighbour or EHO if it comes to it.
    • CommentTimeMar 4th 2021
    Welcome to the forum.

    Sorry to hear of your problem. I can't help diagnose the problem I'm afraid.

    If you make a recording of the noise and post it, somebody may recognize it? Also, it is worth keeping a diary of when the noise occurs in case you do need to take it to the council.
    • CommentAuthortony
    • CommentTimeMar 4th 2021
    most likely fan motor , possibly fan -- compressor itself can be noisy but chief culprit will be fan motor
    • CommentAuthorPeter61
    • CommentTimeMar 5th 2021
    Ive now created a Youtube video thats in two parts, the second is when running noisily in warmer (over 5c). The sound recording doesn't convey the volume or how far it carries but the two show a clear difference in running noise. The first is how Ive heard all other ASHPs running the second is unique to my neighbour.

    Seee link - https://www.youtube.com/watch?v=Hof-B6PSpmc
    • CommentAuthorLF
    • CommentTimeMar 6th 2021
    Struggled to here the loud noise.
    Fan motor bearings would be a service item at that sort of age.
    If they are fixed it will stop full fan failure and save them money.

    If it is high frequency then easy to stop than low frequency.

    Some fence panels around it could direct the noise upwards and away - a longer path will dissipate noise when it comes back down
    • CommentAuthorrevor
    • CommentTimeMar 6th 2021
    I can hear the difference even though I am at the age where I struggle with the higher frequency. I also would be very annoyed to have that disturb my peace. Swop carbon pollution for noise pollution!. Clare Graves an eminent American psychologist coined the phrase "today's solution is tomorrows problem" and how true it probably started with a vengeance with the industrial revolution.
    • CommentAuthorPeter61
    • CommentTimeMar 7th 2021
    Thanks for comments all useful, the second video doesn't demonstrate how loud and far the low frequency sound travels.
    • CommentAuthorNewbuild
    • CommentTimeMar 7th 2021
    I can hear the difference and there is a clear noise. Anyone who works on these regularly will be identify what's going on almost immediately because it's a cyclic noise - the wuwuwuwuwuuwu (lol) nature of it suggests fan related.
    • CommentAuthorPeter61
    • CommentTimeMar 13th 2021
    Thanks for all comments. Neighbour states that ASHP will be reprogrammed to make it run faster at a speed where sound cant be heard.
    • CommentAuthorCWatters
    • CommentTimeMar 20th 2021
    I agree with Newbuild. The louder noise sounds like its modulated. Out of balance fan and/or bad bearings? Ball Bearings are quite cheap but i don't know what they charge to replace them.
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