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So I tried to sandpaper the starting and clean the starter and it lit up now my furnace has a high-pitched humming noise and it will not do anything just curious what other troubleshooting I can do it

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High-pitched humming noise indicates worn out bearings. Check the blower motor bearings.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

farfield
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SOURCE: CARRIER MODEL 38YCA030370 MAKES HIGH PITCH ELECTRICAL HUMMING NOI

Yes it could be the pop off pressure relief on the compressor.
I assume it is the outdoor fan your referring to not running.

If this is a heat pump and it is in defrost (only in the heating mode should your outdoor fan be off and then for only a max of 12 to 15 minutes).
If it is just AC ir is Heat pump in cool mode, the out door fan should run while the compressor and indoor fan are on. Until the thermostat is satisfied on room temp.

This high pitched squealing is indicative of a bad fan motor or capacitor for the out door fan motor. Kill power and test blades to see if turns free. Check the run capacitor inside control panel. It is usually silver or aluminum colored (some are painted gray). The top should be flat with rolled edges and the sides should either be round or oval shaped with no swelling or oil leaking from inside it. If this all looks normal take it to where your going to get a motor any way and ask them to check it or sell you a replacement at the same time. These can go out usually from high voltage (lighting...) or from over heating (bad fan motor, dirty out door coil...).

Hope this helps you if not post back I'll respond as soon as I can. And please rate me as high as you can. Thank you for using Fix ya and good luck.

Posted on Mar 28, 2009

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