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How old is your AC unit?
Also does it sound like the whistling is coming from the fan Blower.
Thank you for that information. Yes it may very well be the motor start capacitor or a relay on the control board making that sound. You will need to open this one up to be sure which part is causing this sound.
Usually The start cap near the motor is the fault, but I have heard that from electronic coils and failing relays.
Once you identify the squealing part, I can help you locate a replacement for it.
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Hi, if the whistle is pretty loud it may be coming from a tiny peizo element used as a warning buzzer.
But this sound could really be coming from a failed coil,or a transformer etc.
If that board was just replaced then it seems it is defective and needs replacing once again. It shoudl still be fully covered under the warranty.
If not you could locate that whistling part and replace it if you have good electronic soldering skills. But I would return that board or have the tech who replaced it bring you a new one;-)
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Thank you John.
Hi thanks John, that worked.
I suspect that board, but who replaced it and why?
I see, was the whistle present as soon as you changed out the board?
Or did it develop sometime later?
Thanks John, yes thats possible but usually what ever board is making the sound thats the one with trouble. Also make sure you dont see that little peizo buzzer f there is one on the board. If not, Its probably just a defective board as you would be surprised how many parts I replace that defective right out of the box lol.
That would be a buzzer PBC mounted for a warning but I don't believe yours has one on the board fro that.
Yours dies have one that will chirp when you turn it on normally.
You simply have a defective new board is all.
Sounds good John, let me know what happens when you replace the board again.
Thank you and have a great weekend!