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It appears that the fan in the compressor unit failed (it works now) but the compressor (it was running w/o fan) was running very hot and hissing. I shut it down and let it cool over night. It does not start, but the fan does at this point. I have no idea how ;long the compressor was running w/o fan support. Concerned I may need a new compressor unit. Thanks.

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The hissing was caused by the overpressure caused by the heat which has triggered the internal valve relief. With the valve open the fluid needed to oil the bearings was never cooled and liquiefied so it hasn't done its job so the bearing was damaged and has now seized. Try to tap it gently with a hammer , it might unseize itself.
If this doesn't helps then indeed the compressor is gone, it will have to be replaced

Posted on May 29, 2011

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The dual run capacitor is possible weak, also check all the electrical connections for tight fitting connections with can cause motor/compressor overheating.
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Which motor is hot...compressor or fan?
Also need to know the model number.
Is this a 3-phase or single-phase unit?

Let's assume it is the compressor...Is it so hot that you can't touch it for more than a second or two? Is the compressor shutting down on internal thermal overload?

Compressor body hot can be caused by a number of things:
1. Low charge (the freon acts as a coolant for the compressor).
2. Electrical imbalance (3-phase only). (check line-to-line voltages)
3. Bearings in compressor failing (check amp draw).
4. Condenser dirty or airflow blocked in some way.
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Hope this helps you get started.

If this helps you, please select YES to the first two ratings questions. Thank you, and Good Luck.




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1 Answer

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