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GSH130481CA condensor and ARUF48601ba fan coil. Server noise at intermittent times,in heat mode, usully in the middle of the night. Sounds as if from fan coil. Fan coil 50 ft from condensor. Fan operating normally with noise.

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  • robert_sm866 Mar 05, 2009

    problem solved. Not related to heat pump. Thanks to all.

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It may be your noticing the defrost cycle which can be noisy at times exspecially at nite when the unit will reverses it cycle temporarily

Posted on Mar 05, 2009

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Coolant fan doesn't come on unless I run air conditioner.


"Coolant Fan" is not necessarily a common term used to refer to any particular fan in a standard HVAC system. Are you referring to the "Indoor Fan" that circulates the air within the living space???? OR are you referring to the "Outdoor Fan" or "Condensor Fan" that circulates the air across the outdoor coil ??

If its the indoor fan on an air handler that's not running unless its in A/C mode, it will be a faulty heating circuit fan relay on the main control board.

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A little more information may help obtain a more specific answer.

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https://www.youtube.com/results?search_query=American+Standard+5000+Heat+Pump+makes+a+buzzing+noise
Defrost cycle noise video:
https://www.youtube.com/watch?v=wudLk0WoIVo


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1 Answer

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1 Answer

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1 Answer

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