• Odd failure of desk fan

    From HVS@21:1/5 to All on Sat Jun 21 10:21:42 2025
    My desk fan packed it in yesterday -- a basic two-speed fan bought from
    Dunelm some years ago, so it doesn't owe me anything, but it was an odd failure.

    It just stopped. In absolute silence. No noise, smoke or smell that
    might be expected if the motor had burnt out; didn't blow the 3A fuse
    in the plug, or trip the circuit breaker.

    I thought maybe there might be an overheating cut-out of some sort, but
    if there is, it must be buried in the interior and not meant to be
    reached by a consumer.

    Not worth fixing, and I'm happy to buy a replacement, but doesn't it
    seem slightly odd that such a simple piece of kit would fail, out of
    the blue, in absolute silence?

    --
    Cheers, Harvey

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  • From Pancho@21:1/5 to HVS on Sat Jun 21 10:31:52 2025
    On 6/21/25 10:21, HVS wrote:
    My desk fan packed it in yesterday -- a basic two-speed fan bought from Dunelm some years ago, so it doesn't owe me anything, but it was an odd failure.

    It just stopped. In absolute silence. No noise, smoke or smell that
    might be expected if the motor had burnt out; didn't blow the 3A fuse
    in the plug, or trip the circuit breaker.

    I thought maybe there might be an overheating cut-out of some sort, but
    if there is, it must be buried in the interior and not meant to be
    reached by a consumer.

    Not worth fixing, and I'm happy to buy a replacement, but doesn't it
    seem slightly odd that such a simple piece of kit would fail, out of
    the blue, in absolute silence?

    Internal fuse? Maybe a transformer? There are lots of way for things to
    go wrong. Open it up and have a look inside.

    --- SoupGate-Win32 v1.05
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  • From N_Cook@21:1/5 to HVS on Sat Jun 21 10:46:18 2025
    On 21/06/2025 10:21, HVS wrote:
    My desk fan packed it in yesterday -- a basic two-speed fan bought from Dunelm some years ago, so it doesn't owe me anything, but it was an odd failure.

    It just stopped. In absolute silence. No noise, smoke or smell that
    might be expected if the motor had burnt out; didn't blow the 3A fuse
    in the plug, or trip the circuit breaker.

    I thought maybe there might be an overheating cut-out of some sort, but
    if there is, it must be buried in the interior and not meant to be
    reached by a consumer.

    Not worth fixing, and I'm happy to buy a replacement, but doesn't it
    seem slightly odd that such a simple piece of kit would fail, out of
    the blue, in absolute silence?


    There has to be an overheat thermal fuse in the mortor winding for the situation of a kid pushing a pencil into the blades or whatever.
    Combined with the room temperature was probably the hottest this year
    and ordinary heat from the motor windings combined with a tired old
    thermal fuse, was the final straw

    --
    Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>

    --- SoupGate-Win32 v1.05
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  • From nib@21:1/5 to All on Sat Jun 21 11:20:57 2025
    On 21/06/2025 10:46, N_Cook wrote:
    On 21/06/2025 10:21, HVS wrote:
    My desk fan packed it in yesterday -- a basic two-speed fan bought from
    Dunelm some years ago, so it doesn't owe me anything, but it was an odd
    failure.

    It just stopped.  In absolute silence.  No noise, smoke or smell that
    might be expected if the motor had burnt out;  didn't blow the 3A fuse
    in the plug, or trip the circuit breaker.

    I thought maybe there might be an overheating cut-out of some sort, but
    if there is, it must be buried in the interior and not meant to be
    reached by a consumer.

    Not worth fixing, and I'm happy to buy a replacement, but doesn't it
    seem slightly odd that such a simple piece of kit would fail, out of
    the blue, in absolute silence?


    There has to be an overheat thermal fuse in the mortor winding for the situation of a kid pushing a pencil into the blades or whatever.
    Combined with the room temperature was probably the hottest this year
    and ordinary heat from the motor windings combined with a tired old
    thermal fuse, was the final straw


    Was the body of the fan hotter than usual? If not then probably not
    winding overheating and thermal fuse. Fatigue fracture of the winding
    wire where it joins a terminal? Could you still turn the fan manually,
    or did one of the bearings sieze?

    nib

    --- SoupGate-Win32 v1.05
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  • From Theo@21:1/5 to Pamela on Sat Jun 21 12:37:13 2025
    Pamela <pamela.private.mailbox@gmail.com> wrote:
    I had the same experience yesterday.

    Mine was a 16-inch floor standing fan which I've owned for about 5
    years. This is it: https://www.amazon.co.uk/Klarstein/dp/B07CGS14NV

    I left it running in the spare room and much to my surprise, when I
    checked it was no longer working. The various LEDs still light up in
    response to the remote control but the blades don't turn.

    I suppose the motor burnt out but, like you, I am surprised as it
    wasn't used for more than about 500 hours in its entire life
    (equivalent to 20 full days).

    AC fans like this typically have three speeds which are driven from two windings, A and B. Your options are to energise A, or B, or A+B. It's a little surprising to lose both windings together.

    I'm guessing something in the common path is going to be the problem, either
    a fuse, a fried triac or something like that.

    (improper heatsinking of power electronic devices is cheap electronics 101, unfortunately)

    Theo

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  • From The Natural Philosopher@21:1/5 to HVS on Sat Jun 21 12:44:42 2025
    On 21/06/2025 10:21, HVS wrote:
    My desk fan packed it in yesterday -- a basic two-speed fan bought from Dunelm some years ago, so it doesn't owe me anything, but it was an odd failure.

    It just stopped. In absolute silence. No noise, smoke or smell that
    might be expected if the motor had burnt out; didn't blow the 3A fuse
    in the plug, or trip the circuit breaker.

    I thought maybe there might be an overheating cut-out of some sort, but
    if there is, it must be buried in the interior and not meant to be
    reached by a consumer.

    Not worth fixing, and I'm happy to buy a replacement, but doesn't it
    seem slightly odd that such a simple piece of kit would fail, out of
    the blue, in absolute silence?

    Nope

    Not all faults make smoke or noise.

    --
    When plunder becomes a way of life for a group of men in a society, over
    the course of time they create for themselves a legal system that
    authorizes it and a moral code that glorifies it.

    Frédéric Bastiat

    --- SoupGate-Win32 v1.05
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