Question about Fujitsu ASU12RLS2 Wall Mounted Indoor Unit Air Handler 12,000 BTU 1

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Buzzing sound in both cool and heat mode - Fujitsu ASU12RLS2 Wall Mounted Indoor Unit Air Handler 12,000 BTU 1

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Hardware erroe , check pcb for any brokage aur shorting in pcb

Posted on Oct 15, 2013

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BUZZING NOISE FROM MY HEAT PUMP


Take a look at this YouTube page that explains with good videos what are some of the common problems with heat pump noise. The one that seems dominant is the defrost cycle a heat pump goes thru when it melts ice off the evaporative coils. In defrost cycle, The compressor runs but the cooling fan does not, so you will hear a loud buzzing sound and the unit sounds like it is stalled...because only the compressor is running to generate heat to melt coil ice.

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

Mar 06, 2015 | American Standard 5000 Heat Pump Unit

1 Answer

Heat Pump makes a surging/buzzing sound every 20 seconds


You might have a short going to your reversing valve. Check the temperature of all three lines out of the valve. The one on the left should be cold and the one on the left should be warm hot. . Check voltage to the valve.if it fluctuates that might be the reason for the buzz.

Mar 04, 2015 | Heating & Cooling

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We Have a GE Model JVM 3670BF001 Spacemaker that started making a buzzing noise periodically when turned on. After a few times of buzzing it quit heating.


You probably had a bad connection now with pop probably separated. You may also have a bad thermal over heat device. one brand is Thermodisk. But you need to know what you are doing. Might be time to replace.

Oct 18, 2012 | General Electric JVM3670BF GE Profile 36"...

1 Answer

Buzzing sound... Turntable stopped. food heats up but uneven. No microwave fan when heating.. no light inside expensive fix?? Unit is 10 years old


If the microwave oven is 10 years old then it is time to consider a new unit, by your description it is going into cascade failure where different parts have stopped working, the buzzing sound is the magnetron warning you, it is about to fail. The fans job is to keep the magnetron cool while it is running.

Mar 08, 2011 | GE JVM1850 1000 Watts Microwave Oven

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Our window AC/heat unit fan only buzzes when turned on- no matter whether you turn on fan only or heat or cool mode.


so the fan does not spin and blow air? it could be a stick broken fan try free spinning it make sure its turned of. if fan spins freely its probably your start capacitor which is not to expensive.

Nov 10, 2010 | LG Heat cool Window Air Conditioner

1 Answer

When you turn on the TV it makes this buzzing sound like something is spinning inside the TV. After a while the TV cut off on its own. It has a new bulb in it.


check the fan that cools the bulb. if its rubbing something that would make the buzzing sound, and if its not cooling the bulb it will shut off when it over heats.

Sep 14, 2010 | Samsung DLP HL-P5663W 56" TV

1 Answer

Buzzing sound when aux heat comes on


Sounds like it could be a effiency function to warn you that the heat elements are on. Check your thermostat manual and see if you can turn this feature off. If this is not a feature then the thermostat may be wired wrong or something in the circuit may be trying to short out.

Jan 04, 2010 | Honeywell Electronic Programmable...

1 Answer

Thermostat says ''Aux heat on'' and buzzes when we turn on heat


You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Nov 19, 2008 | Honeywell Electronic Programmable...

2 Answers

There's a buzzing sound coming from my central air conditioner unit outside. The fan is quiet but I hear a buzzing sound. Should that be happening? Sounds like there's something loose.


Things that are not broken: The big relay that powers the compressor often hums or buzzes when the unit is running. Several brands of heat pumps keep their reversing valve "on" any time the thermostat is set for "cool". They buzz, too.

If something really is loose, the only way to fix it is to look at the machine and take off panels until you find what is buzzing.

Jul 20, 2008 | Heating & Cooling

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