Question about Goodman CLQ36AR49 Air Conditioner

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GOODMAN HEATPUMP AC REVERSING VALVE MAKING A VERY LOUD BUZZING NOISE IN AC MODE. AC AND HEAT WORK FINE, NOISE ONLY WHEN AC IS ON AND UNIT NOT RUNNING.

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  • dencash4386 May 19, 2011

    THE UNIT IS NOT IN HEAT MODE. IT MAKES THIS NOISE IN AC MODE.
    THE AC CYCLES ON AND OFF NORMALLY, ITS ONLY WHEN THE UNIT IS
    NOT RUNNING THAT IT IS MAKING NOISE, UNTIL IT COMES BACK ON AGIAN
    SOMETIMES BUZZING ALL NIGHT.

  • dencash4386 May 19, 2011

    THIS IS A GOODMAN CPKJ60-1C AC

  • Vee Wafflez Jun 18, 2013

    only time ive seen heatpumps to get THAT loud is when its running too high of head pressure

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  • Goodman Master
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Hi and welcome to FixYa, I am Kelly. The reversing valve making noise (probably a 60 cycle noise) is a sign that the reversing valve is not stoking a full stroke to where the armature of the coil is neutralized by the internal plunger moving to the neutral position. Sometimes you can take 2 hammer handles to the BODY of the reversing valve with some careful strikes so as not to DENT the body and loosen up the internal piston so that it strokes fully. If that does not make it snap out of the buzzing routine then the only option is to replace the reversing valve. This will require the system to be drained of coolant, purged, the valve replaced and then the system recharged which does not come cheaply. It is not going to hurt anything buzzing. I know it is irritating and annoying but my thoughts are if you can give it some wooden taps and at least quiet it down some what to leave it alone unless your willing to go though the expense of a full system drain & service + a service call with a reversing valve change.
Here is the worst that can happen.... the solenoid on the reversing valve gets hot from not fully stroking and fails at which point you get the new reversing valve installed.

Thanks for choosing FixYa,
Kelly

Posted on May 20, 2011

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  • Master
  • 1,157 Answers

Hi dencash4386,

The buzzing noise that you're encountering is actually the running compressor. This is normal and part of the defrost cycle. During the defrost cycle the fan on the outdoor unit shuts off to keep the heat on the coils to defrost them. The humming of the compressor is covered by the air noise from the fan.

Hope it helps.

Thank you for using FixYa.

Posted on May 19, 2011

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  • Master
  • 3,917 Answers

Hi

It sounds like it's just going through a defrost cycle.

The coils on the heat pump will be quite a bit colder than outside air when it's running in the heat mode, and it's normal for them to freeze up, which is why the defrost cycle is part of the design. It'll shut down the heat pump's fan and pump hot gas through the coils until the ice is gone.

When it's colder out, with snow and ice, there's not as much free moisture in the air to collect on the coils and freeze, so, typically, you won't have as much ice accumulation during colder temps.

It can also be caused by the compressor slugging a bit of liquid refrigerant that's condensed in the head. This can be harmful to a reciprocating compressor, but if your unit's only 6 months old, it's likely to have a scroll compressor, which is better able to handle a bit of liquid from time to time.

I'd say that it's nothing to worry too much about. If the noise really bothers you, you can ask the installer to install a sound deadening blanket over the compressor. They're relatively inexpensive and if properly installed can cut the noise down considerably.

Please check this helpful link to troubleshoot your problem when the heat pump is making noise:-

http://www.ductworkinstallation.com/NoiseReduction/HeatPumpNoise/tabid/274/Default.aspx

Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com

Posted on May 19, 2011

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