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Ac/heating unit not working properly. If the temp outside drops to around 40 degrees the unit will shut off and not come back on until temp outside rises to above 60

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  • carolmiller9 Dec 07, 2008

    We have not pin pointed the exact problem but this is definitely the right direction. Thank you very much

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Check your filters, make sure they are not dirty. Make sure your outdoor sensor is working properly. If it is then check the setting on the defrost timer. If you don't know how, you'll have to call an expert to come fix it. Diagnostic fees generally are around 65 to 125 depending on time and contractor.

Posted on Dec 06, 2008

  • Armando Bernal Dec 07, 2008

    I appoligize for not being able to diagnose an excact problem, perhaps, repost and another expert here may have more options. It's difficult to give advise a a non-trained person regarding Heating, and Air Conditioning equipment, I hope you find your problem.

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2 Answers

Heater will not activate until outside temp. is above 40 degrees


If you have a heat pump the compressor is locked out below that temp. If you have a dual fuel - hp/gas, the gas burners should come on as would the electric heaters if you have electric heat as backup.

Jan 19, 2016 | Air Conditioners

1 Answer

Not sure the heat pump is producing enough heat


lower the fan speed to low and if you do not close your turns at 50 degrees Celsius then check the freon

Nov 04, 2011 | Air Conditioners

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 Air Conditioners

1 Answer

I have a Lennex heat pump unit which was installed in 2008. Our area (Savannah, GA) has experienced some abnormal cold temps lately. Yesterday, I noticed the outside of the unit had frost on the unit. ...


Heat pumps are the same as an A/C unit only it works in reverse. Instead of blowing cold air inside and hot air outside it blows hot air inside and cold air outside. The heat being blown inside is extracted form the cold air outside. Its called Latent heat Latin for hidden. Believe it or not even though its 20 degrees outside there is still heat in the air. Example if you want to drop the temperature of a freezer from 20 to 10 degrees you have to remove heat .I know your getting unusal weather and that is the problem. Heat pumps can only work no lower then around 20 degrees outside.Heat pumps are never used above the freeze line. With your unusal temperatures thats basically where you are now. Ride it out. When your temps rise a little your be fine. Im in Chicago.

Jan 15, 2011 | Air Conditioners

2 Answers

The AC doesn´t work when outside temp goes 100 degrees and above


Try using a garden hose to wash down the condensor coil (the coil that is exposed to the outside air).
During the cooler times when it seems to be working, check the temperature difference of the air coming out against the temperature of the air coming in (room temperature air). The temperature should be approximately 16 to 22degF difference. If you are not getting at least 16degF air, you most likely need to have your unit serviced to see if professionial cleaning or a recharge is needed. If you are getting the temperature difference but not getting the amount of cooling you need during hot weather, it could be a capacity problem. You can perform a quick test by using the calculator on this site:
http://www.goodhousekeeping.com/home/air-conditioner-calculator.

I hope you find this information helpful. Good Luck! :-)

Mar 08, 2010 | LG Heat cool Window Air Conditioner

1 Answer

My outside heat unit is frozen and it is 10 degrees out, will it thaw while I have it on emergency heat? How long do I keep emergency heat on?


Switching to emergency heat will not defrost the unit.

If the Heat pump is malfunctioning, continue to use the emergency heat until the unit can be repaired properly.


At ten degrees, no heat pump can keep up., but it should be automatically bringing on the heat strips as back up heat. (same thing as emergency heat, it's just automatic.)

Either the extreme cold is overloading the defrost system, due to lack of properly operating exterior temp sensors or the defrost is malfunctioning,

Feb 07, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Its 15 degrees outside and my amana unit is off. every so often it kicks on by itself and runs for about 10 seconds then shuts off again. while it is running the control panel flashes FP, what is it trying...


I was wondering the same thing about our unit until I found the specs online and read that it has freeze protection. When the temp goes below 40 degrees, the fan comes on to prevent damage to the unit.

Dec 23, 2009 | Amana PTH123B25AJ Heat Pump Air...

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

DURING DAYTIME WHEN HOT OUTSIDE 35-40 DEGREES C, AC TRIPs off


units are not able to work properly above 90, 1.0 T not go for more than 1 room. is outside of unit clean? if not turn off power to unit then spray 409 or simple green or something along those lines of cleaners on the coil part (soak it real good) it should cover entire coil as much as possible. let cleaner sit on it for about 10 minutes then use water hose to rinse as good as you can. wait about 10 minutes then try unit - so work better.

Jun 15, 2009 | Air Conditioners

2 Answers

Heat Pump Stops Working only in the Early Morning


When the unit does what you say does the fan motor outside stop also , if it does that means it is in defrost mode and should kick back over to normal after the system heats up the coil enough

Nov 24, 2008 | Weather King 12AJA4801AH Air Conditioner

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