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Heat pump makes trumpet sound coming out of defrost when it is below 32 degrees outside

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  • Master
  • 587 Answers

That's normal you are hearing the reversing valve shift when it comes out of defrost.

Posted on Dec 17, 2016

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6ya6ya
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Posted on Jan 02, 2017

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boanhtgclg
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SOURCE: Ruud heat pump UPKA 036JAS,

probably just the defrost cycle, or could be pressure equalization

Posted on Nov 17, 2008

mrgrzz
  • 88 Answers

SOURCE: New 14 seer split ruud heat pump makes very loud knocking noise

Well you may want to have a tech come out and check the freon level, but mostly when going into defrost, some units make alot of noise, the freon is reversed in the unit by way of the reversing valve, it makes a whooshing sound like freon is draining off, as far as the knocking noise, could be as I said in the beginning, might be low on freon, but it could be that, this particular unit does this, I have had units make some really strange noises in the past but functioned perfectly, hope this helped, please let us know, thanks again,
mr.grzz

Posted on Jan 24, 2009

jumptrout51
  • 3361 Answers

SOURCE: Carrier PTAC Condenser ices over.

You are describing normal operation for a heat pump unit.

Posted on Mar 09, 2009

mastatech
  • 478 Answers

SOURCE: Heat Pump Cycles On and Off and Air Handler Noisy

I am pretty sure you have a low charge and the pressure switch is kicking it off. probably just a pound or two however the accumulater will sometimes hold more.

Posted on Mar 31, 2009

  • 117 Answers

SOURCE: heat strips do not energize during defrost cycles

if your heat strips are not coming on, then there are a few things to check.

The first one would be that the heat strips are actually working. The easiest way to complete this task is to turn the system on into emergency heat and turn the thermostat up. If you get heat accompanied by the traditional strip heat burnt smell, then you know the electric heat strips are working.

The second thing would be that the air handler is receiving a command for heat during defrost cycle. If the command is present with no heat, then you most likely have either a wiring issue or a failed electrical relay or contactor.

The third thing would be the defrost board itself, for it is the component that calls for electric heat strips to come on during a defrost cycle. You may or may not be able to force the defrost board into a defrost cycle and then check that the heat strips are on or not.



It sounds as though your defrost board is bad with the symptoms you are describing.

Good luck.


Posted on Jan 14, 2010

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In middle of night, heat pump makes noise like something comes on and builds up then cuts off with a humming sound over and over again. Temp outside was only 43 degrees F.


The unit is defrosting. This is normal for heat pump systems, and they do it worst when the outdoor temperature is between just below freezing up to about 45 degrees F. The more humid it is outside, the more frost builds up, and the more the outdoor unit will defrost. Below about 25 degrees, most of the water is on the ground (not in the air), so the units will not have to defrost as often when it is that cold outside. If you are curious, you can monitor the unit on a cool, foggy day to see if it is actually building up frost, or if the unit is set wrong and defrosting on a false alarm. IF THE UNIT DOESN'T LOOK VISIBLY FROSTY, IT HAS BEEN SET TO DEFROST TOO OFTEN AND IS WASTING ENERGY! A TECH CALL TO REMEDY THE UNNECESSARY CYCLING WILL PAY FOR ITSELF QUICKLY!

While the outdoor unit is in this mode, it should be steaming and making a buzzing noise. This verifies the frost is being boiled off of the outdoor coil. 25355479-u40lsvyytnuesyuv3fbafhtd-5-0.jpg
Please mark my answer as useful.

Jan 05, 2015 | Heating & Cooling

1 Answer

I have a goodman self contained heat pump that is 3 and 1/2 years old. I wake in the night to hear what sounds like the fan runnning and running and running and air moving thru the vents. Then I will hear...


Heat pumps are a very efficient design when working properly. But lose efficiency the colder it gets outdoors. I usually tell people when it drops below freezing to turn the thermostat to aux or em. heat. A heat pump can remove heat from 20°f air. But not very well. More heat at 30°f air, obviously, and so on. So the colder it is outdoors, the longer it will operate to remove heat from outdoors. And then, if it can't keep up, it brings on the electric heat elements to compensate. Now you are running both outdoor and indoor heat. This is where it's inefficient and costly. Also, the outdoor will start to freeze up. This is normal unless you can see a substantial amount of ice. The heat pump will engage defrost mode, cycling on the electric heat indoors. And defrost mode is actually cooling mode! The reversing valve in the heat pump switches to cooling mode, cycles off the outdoor fan, and defrosts for a set time or temp. So now your electric heat is engaged, and your indoor coil is a COLD coil! Not hot! Very inefficient. These 2 things are why your elec bill is higher in the winter. So it makes sense to me, if the elec heat is going to be on anyway, to move the tstat to aux or em. heat, when it's going to be below freezing outdoors. This will turn off the heat pump and use elected heat only. The only down side to this is, if you don't have enough elec heat to keep you warm, you may need both heat pump and elec heat. So trial end error until you find what works. Also, have a qualified tech check the system for operation and efficiency. Hope this helps!

Apr 08, 2017 | Goodman PHKJ048-1 Air Conditioner

1 Answer

I just turned on my liftime infred, the power light goes off and on but heat comes out on eco........Do I need to have the time set. Or does the thermostat take care of the off and on.,


Unless the system was ever programmed to turn on and off at set times,-- the setting of the clock shouldn't interfere with its putting out heat.

Is this a heat pump / AIr conditioner unit? and is it real COLD outside?

Here are some comments on heat pumps:

Remember, for an air conditioner to PUT OUT HEAT-- (as HEAT PUMP) -- there has to be some HEAT outdoors, to make the process work...
So-- ask yourself-- How cold is it outside?
How cold was it outside, the last time that my AC worked good as a heat pump?


Possibly the coil outside is all frosted up?--

Shutting it off, and letting the outside coil defrost might help-- but-- the basic law of physics still stands: To get heat inside-- there has to be some heat outside! (Likely your unit won't give you much heat inside, when it is below 50 -- or for sure-- below 40 degrees outside!)

Give us a few temperature readings- inside and out, and then gives us clues as to what is running, and what is not-- maybe we can trouble shoot deeper. Is the compressor running?-- does it sound like it is actually working-- or just running-- sort of like 'running but not really WORKING'?

Let us know--

Mack B

Jan 19, 2011 | Heating & Cooling

1 Answer

Somethimes t gives a tikkend sound by a half hour and then it stops and you onely hear a constant quit noise. greeting Mary


Are you trying to heat with your air conditioner?-- here are a few points to keep in mind:

Remember, for an air conditioner to PUT OUT HEAT-- (as HEAT PUMP) -- there has to be some HEAT outdoors, to make the process work...
So-- ask yourself-- How cold is it outside?
How cold was it outside, the last time that my AC worked good as a heat pump?


Possibly the coil outside is all frosted up?--

Shutting it off, and letting the outside coil defrost might help-- but-- the basic law of physics still stands: To get heat inside-- there has to be some heat outside! (Likely your unit won't give you much heat inside, when it is below 50 -- or for sure-- below 40 degrees outside!)

Give us a few temperature readings- inside and out, and then gives us clues as to what is running, and what is not-- maybe we can trouble shoot deeper. Is the compressor running?-- does it sound like it is actually working-- or just running-- sort of like 'running but not really WORKING'?

Let us know--

Mack B

Jan 18, 2011 | Heating & Cooling

1 Answer

Will not put out heat


Remember, for an air conditioner to PUT OUT HEAT-- (as HEAT PUMP) -- there has to be some HEAT outdoors, to make the process work...
So-- ask yourself-- How cold is it outside?
How cold was it outside, the last time that my AC worked good as a heat pump?


Possibly the coil outside is all frosted up?--

Shutting it off, and letting the outside coil defrost might help-- but-- the basic law of physics still stands: To get heat inside-- there has to be some heat outside! (Likely your unit won't give you much heat inside, when it is below 50 -- or for sure-- below 40 degrees outside!)

Give us a few temperature readings- inside and out, and then gives us clues as to what is running, and what is not-- maybe we can trouble shoot deeper. Is the compressor running?-- does it sound like it is actually working-- or just running-- sort of like 'running but not really WORKING'?

Let us know--

Mack B

Jan 18, 2011 | Samsung Heating & Cooling

1 Answer

Fujitsu 18000 goes into defrost once an hour at 28to 32 degrees outside temp. trying to maintain 70 degrees inside . test run was ok on start up. just installed 3 days ago .. vacuum out the lines. lost...


what is the lowest outside temp manufacturer suggests? Heat pumps are not very good when it gets good and cold... call the installers and see what they have to say for you.

Feb 21, 2010 | GE Quiet-Aire Ductless Heat Pump Split...

3 Answers

Goodman package- no heat below 30 degrees outside


I believe the unit you are describing is a heat pump. Heat pump are great when the temperature isn't below 30 With low ambient temps. outside it is much more efficient and comfortable to run aux. electric heat from the heat pump.

Jan 03, 2010 | Goodman PHKJ048-1 Air Conditioner

1 Answer

HEAT PUMP OPERATION FOR TEMPSTAR SMART COMFORT 2400, MODEL THC436AKC1. LOWEST OUTSIDE TEMPERATURE FOR OPERATION?


I have installed many heat pumps and if it is installed without and ouside temperature sensor I would not recommend running it below freezing 32 degrees farenheheit. Running a heat pump at low outside ambient temps. can hurt your compressor and that is the most expensive part of the outside unit.

Dec 20, 2009 | Heating & Cooling

1 Answer

Hello, I have a 1.5 ton rudd ac/heat pump


Your outside unit is not defrosting. You need to call a service tech to check it out. Defrost board sensor or low on gas. Also you amy have an outside tstat that is not working correctly. Rus

Dec 06, 2009 | Ruud UAMB042 Air Conditioner

1 Answer

Goodman heats but defrosts turns on before desired temp.


Yes. The defrost cycle of a heat pump is actually turning on your airconditioning to heat up the condenser to thaw it out. During this cycle your electric strip heaters "should" be adequate enough to compensate for the a/c being on. At about 30 - 34 degrees outdoor temp there is not enough heat in the air to to adequately heat your home with the heat pump only. Some technitions will use an outdoor thermostat to turn off the heat pump when it is under 34 degrees outside. If you are to cold when its under 34 degrees intall more electric strip heaters.. But if you do this your electric bill may go up significantly.
Welcome to the wonderful world of electric heat pumps (lol).
Good luck.

Mar 29, 2009 | Goodman GMS90703BXA Heater

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