FTx25 strange noise from indoor unit

Chaps

got some older 2013 indoor units 2 out of 150 which are making a strange motor type noise. but we have changed the stator and both bearings but still the same..

link to video:https://youtu.be/V8mSsOl2Y_E

has anyone had similar and what was the solution?

If that is BLDC motor, than probably problem is in control electronic!

Quote:

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Originally Posted by nike123

If that is BLDC motor, than probably problem is in control electronic!

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that will be the indoor unit pcb then?

Guess you would have sussed this but anyhow, couldn't be sure from the video but sounded a bit like the fan was out of balance with the drumming noise?

Quote:

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Originally Posted by Tayters

Guess you would have sussed this but anyhow, couldn't be sure from the video but sounded a bit like the fan was out of balance with the drumming noise?

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on going

as soon as you switch off the noise stops but the fan keeps spinning..

As Nike has suggested, probably induced electronic noise from faulty PCB.