Question about Amana PTC153B35AE Air Conditioner

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Heat... On low or high heat, the unit only heats for a few minutes then blows only cold air even with the temp turned all the way to heat. The status light on the board shows ok. Any ideas what to look for?

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Re: Heat...

It sounds like the thermostat bulb has moved or the unit is getting an immediate air recirculation due to a partial blockage or air diversion close to the unit causing the warm air to get back to the thermostat bulb too soon, heating only a very small area.


Posted on Jan 06, 2008

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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

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Find a reputable HVAC contractor to do a room by room analysis with heat and cooling loads calculated and units sized and duct requirements and compare to what you have.

The air not being cold is not necessarily an indicator of anything malfunctioning. High efficiency units for instance don't produce cold air.

Since you have had someone look at it, the duct work may be collapsed which restricts air flow or uninsulated which warms up the supply air. Either one is a possibility. Any Cox Cable guys been stompin' around your attic lately? Wouldn't be the first time.

Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.

We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.

Sorry, to tell ya but it is normal if the outdoor temperatures are much below 45 degrees. Below 45 degrees there is little heat outdoors for the heat pump to grab to heat the home so it will run 24/7 and blow cool or cold air. Below 45 the temp of the air coming out the vent will decline and you will get no heat from the heat pump itself as you near freezing.

Your emergency heat or auxiliary heat is electric strip heat. But it only kicks in during normal operation if the temp in the house drops 3 degrees below the setting. (some tstats if can be 5 deg.) Otherwise the heat pump will blow cool or cold air the rest of the time if it is too cold out.

To prevent it from running all the time and blowing cold it is recommended if the temp outside is falling below 45 degrees you should just switch to the emergency heat setting, which shuts the pump outdoors off, and just heat with the electric.

But if there is no heat outside the heat pumps will blow cold. They are the cheapest and most efficient forms of heat but only as long as the outdoor temp is above that 45 deg..

I'm guessing that if you haven't experienced this you live in some place with moderate winter temperatures like in Northern Florida and rarely get very cold winter temps like the freezing you have seen there recently.

It will likely blow much warmer when the outdoor temp rises.

Aug 02, 2010 | Air Conditioners

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Heat pump stops working in cold weather

Sounds like there is a problem with your unit. The cooling tower doesn't have anything to do with the compressor other that the delivery of water to your heat pump. The compressor is probably shutting off on a low pressure because the water is cooler than in summer. I think the heat pump you have is low on charge or has a defunct TXV.

Jan 11, 2010 | Weather King 12AJA4801AH Air Conditioner

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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

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Central heat/air unit for home blows cold air

could just be heat trapped in ductwork for attic temp or from not running for more than a few hours.

Jan 13, 2009 | Haier HC48C1VAR Central Air Conditioner

1 Answer

Heat pump blows heat half the time and cold half the time

It sounds like it is just going into the defrost cycle. Go outside and see if it is iced up. If it is, it reverses itself to melt the ice. Heat strips should come on if unit has them

Dec 03, 2008 | Air Conditioners

2 Answers

Intertherm heat pump blows hot then cold then hot

You may have a problem with a temperature safety system.  Before changing anything else, check to see if the unit is clean!!!  Dirt/dust can fool the safety system into an overtemperature status.  Inspect the heat coils for damage and dirt.  Gently clean.  

Nov 23, 2008 | Intertherm P3RA-048K Air Conditioner

2 Answers

My air conditioning unit is not blowing as cold as it did, nor is it blowing as hot as it did in the heating mode

90 percent of the time the freon charge is low and lack of freon lessens the amount of compressed heat that can be created and also the amount of heat that can be extracted. hence less cooling and less heating. however the exact same thing can occur when a change over valve gets stuck partially between heat and cool . it then mixes the hot and cold together and you get poor cooling and poor heating. you check it with a gage. fed law requires that you have an epa certification to apply a gage. low pressures in heat and cool on both high and low pressure gages are a sign of low charge. if low pressure and high pressure are close to the same on both gages then a good chance valve is stuck half way between. you can also sometimes check by feel . at the change over valve two lines should be virtually to hot to touch and two should be cold to the touch. one is heating flow and other is cooling flow. if the valve is stuck then temps will be within a few degrees of the same on all. low charge and the hot lines won't be hot hardly .and the cold line s barely cool. look for white frost forming in the heat mode outside at the condensor tubing shortly after you turn on the heat. thats a sign of low charge. good luck.

Nov 04, 2008 | Air Conditioners

2 Answers

Heat pump is not kicking in, no heat at 42 degree outdoor temp


Most likely has a freon leak , or a control problem causing heat to turn on, or if you have a heatpump the reversing valve has a problem.

Oct 10, 2008 | Amana PTH123B35AE Air Conditioner

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