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Unit quits heating while it's running, especially when outside temperature is 32 or below

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The unit CANNOT heat at lower than 33 degrees, so expect auxillary heat to kick in.

Posted on May 18, 2011

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When em heat is on my outside unit runs but when not on em heat it doesn't. Which setting is best to use?


Has this always been this way? When the emergency heat is on the outside unit shouldn't run. When in normal heat, no emergency heat, the outside unit should be running unless the temperature is below the balance point ( usually around 35 degrees). If this has always been this way and the outside temperature is above 40 degrees you might have your 1st stage and 2nd stage wires switched.

Nov 27, 2016 | Heating & Cooling

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I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital...


I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

Jul 11, 2011 | 2000 Pontiac Grand Prix

1 Answer

At what temperture should you turn it to aux heat and why does my furnace run for hours


It should switch to the aux heat automatically, when it reaches a preset temperature. Usually, when the outside temperature reaches 32 degrees, if it's a heat pump furnace. It can bet preset a little higher though, depending on the unit. If it's extremely cold outside (in the low teens) It may run a lot longer just to keep up. Especially, if you home is not energy efficient.

If your's is not switching over automatically, the sensor switch on the heat pump may have gone pad or the aux heating strips my not be working at all. This requires the service of qualified heat pump service person..

Feb 11, 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

Unit set to heat but outside unit fan won't turn on. Outside temp is below freezing. The weird thing is that you unit is putting out heat and not set to emergency heat


If it is a heatpump, the outside unit should not turn on below 35degrees or so. Below that temperature, the unit cannot effeciently exchange heat. When the outside temperature is low, the system automatically switches over to auxillary heat which uses the same heating elements as emergency heat.

Jan 11, 2011 | Ruud Heating & Cooling

2 Answers

We live in Texas and temperature is expected to hit low teens the next couple of days. Will I need to engage the emergency heat or should I allow the outside unit to run as normal?


if the temperature is going to be below freezing or near 32 degrees farenheit I would run the aux. heat as the heat pump is not efficent in low ambient outside temps.

Jan 07, 2010 | Heating & Cooling

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

Goodman PHJK048 Heat Pump Package


ok...where to start.lol ....the thermostat is just a switch.It will tell the unit to run or not run.if you measure the temp with the heatpump running,the air is warmer than 68 but it feels cool to you because your body is 98.6.The unit will run more often and for longer periods when the temperature drops outside for a few reasons.First,your house has more of a load to heat,meaning you have more heat loss because of the difference in temperatures outside and inside.Second,your heat pump pulls heat from the outside air.The colder the air outside,the less btu's for it to pull.If you have anymore questions hillbuck29@aol.com Hope this helps,Dave

Nov 10, 2008 | Goodman PHKJ048-1 Air Conditioner

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