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Heat/ac pump outdoor unit is cutting on and off frequently could freon level be low?

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Re: heat/ac pump

- If it is a high wall unit yep under charge refrigerant is one of the cause.
- Out of range thermistor is also can also be the cause of tripping outdoor unit with matching blinking light same as low refrigerant.
- Dirty indoor and outdoor can also be the cause
- If your indoor and outdoor is clean start the unit in cool mode and monitor the outdoor pipes. If your suction pipe is icing or dry then your unit is under charge, but if your suction is cold and sweating then the system is ok and sure that the thermistor sensor is defective.


Posted on Jan 08, 2008

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Re: heat/ac pump

Possibly. Does the outdoor fan stay running or does it all shut down? Please advise.


Posted on Jan 08, 2008

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Combo Heat/AC Outdoor unit/Will heater work if AC does not?

If thers freon in system it will heat. If none its just pumpin air. Hav it pressure checd or pump testd to see wy no ac. Blower motor cud b bad....

Sep 25, 2015 | Air Conditioners

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Hello, I have a split level Samsung AC unit. Recently the outside unit formed ice on it, so i had a tech look at it and he said that it was freon low level prob, so we got the level back up and it ran for...

Yes it is! These are sealed systems, so if the tech made no effort in locating your leak, it will continue to loose freon. We are required by the E.P A. law, to make every effort we can to locate the freon leak. We can get away the first time, but always check for any signs of leakage. How much freon did he add? Should say on the service order as we charge by the lb. Look on the data plate on the outdoor unit to see what it holds, and compare how much was added. The compressor is working overtime trying to keep up. I would schedule a leak check to take care of the problem. They will not let us keep coming out to add freon with out finding the leak, its changed so much do to our o-zone layer. Please rate me on my help to you.
A/C, & Heating Contractor
The E.P.A. keep records of our freon use, and where it goes.

Jan 21, 2011 | Air Conditioners

1 Answer

My Goodman GSC130361DE 60 Htz has problem with coils iceing up. Cleaned several times.

Hi, I am assuming you are talking about the indoor coil icing up when you are in cooling. The reason I am asking this as this appears to be a heat-pump and they will ice up in the winter at the outdoor unit. I will go with the indoor coil. If the indoor fan is blowing up to speed and you have cleaned the indoor coil but still have this ice forming, it could very well be that you are low on freon. This will also cause the suction line, the large copper line outdoors to ice and on into the indoor coil. This will happen if you have developed a leak some where. Also, make sure you have good strong return air coming back through the air filter, because if you have problems with the duct work like holes from varments, or you have had any repairman around the duct work, sometimes they will flatten it causing no air flow and you will have ice. My bet is you are low on gas. Shut the unit off to make sure it has no ice on the coil, and go to the outdoor unit. Have someone turn it to cooling and put your hand above the fan on the condenser coil. The air should start to get warm and then hot if the freon level is ok. This also depends on the outdoor temperatures. The hotter it is outdoors, the hotter the air will be. If it is rather cool, around lets say 75*F, and this copper suction line is starting to form ice, the problem is it is low on freon. In this case, this is something you will need to call a tech out to charge the unit. You have to be certified and be able to buy the right freon which is only available to a/c and refrigeration tech's. If this is a heat -pump, and it is winter where you are and the outdoor coil is icing up, let me know and I can go through the steps to check this out. I do believe this is a summer problem where you may be, but you never know unless you ask. Please don't forget to rate me on this post as I am sure you will be kind. I wish I could save you a tech call, but if its low and you have cleaned the indoor coils, and filter is clean, then this is the problem.
A/C, Heating, & Refrigeration Contractor

Sep 26, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer


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

1 Answer

My amana heat pump will start and run momentarily and stop several times, and eventually it works, the house stays at 70 degrees so it works but this does not sound right what's the problem if any?

Hi; I need more info. Do You mean the outdoor unit is stoping and starting while running in a call for heat by the tstat. When heat pumps run if the temperature out side reaches low enough the outside unit will go into a defrost cycle to remove any build up of frost or ice. If the outdoor unit has a dirty coil or a low freon issue this also can trick the unit into a premature defrost cycle. Now here is another scenerio.If Your ac is running in the cool mode and stops prematurly there could be several problems. Low freon level, faulty fan motor causing the compressor to go into a freon bypass mode wich sounds very spewy. Please tell me if you are in heat mode.. Also how old is the unit. Sometimes a severly worn control contactor can disallow all the needed voltage to cross over to Your fan motor and compressor. Watch unit while its acting up... Also when unit goes into a sceduled defrost the fan will stop this is normal and will restart when the unit comes out off defrost You will here this big swoosh sound. Thats the freon being redirected back into the heating path.Let me know...alpharome416

Jan 22, 2010 | Air Conditioners

2 Answers

My heat unit will not blow hot air unless we go outside and hit a button on the back bottom of the unit. Once we do that it will blow hot air for that cycle. when it is time for it to come on it is cold...

If it does not have a furnace or heating elements for heating, then it is a heat pump, which is rare for a central AC system, but makes sense of the fact that it blows warm air when you reset the pressure switch, which may indicates freon pressure charge problem if your AC system has a reverse valve and uses freon to for heating (heat Pump).

Do you get heating when outside unit runs? if you do, check freon pressure levels and top up to required pressures. The button you depress is a pressure reset switch ... that is if your AC system is a heat pump ... which, as pointed above, it is not common for central ACs.

Nov 07, 2009 | Ruud Central System Air Conditioner

1 Answer

Weather King 13AJA36A01 AC freezing up at night

check the inside coil is dirtyor may be low on freon

May 14, 2009 | Weather King 12AJA4801AH Air Conditioner

1 Answer

Ruud Heat Pump blows room temp on Heat and AC setting

A "Heat-Pump" is also known as a reverse cycle air conditioner, this means on heat the outdoor unit acts like the indoor section and vice versa. So in all probability you need to have it leak checked and recharged.

Apr 27, 2009 | Ruud UBHC Air Conditioner

1 Answer

Air conditioning unit

On a "Non Heat Pump" unit, icing of the pipes is not good. It is an indication that you either have a low freon level (Charge), low load, wrong superheat.
A low load usually means, in this case, something wrong with the air flow. Clogged filter, wrong fan speed, something blocking the return air grill, like a chair/ blanket, etc.
If low on charge, the evap (Indoor Coil) will ice up and the ice will then slowly creep along the pipe untill it gets to the outdoor unit. This is really no good. Air cannot go thru solid ice so naturally there is no cooling happening.
If a company replaces the outdoor unit (Condensing Unit), there is no warranty on the indoor unit. I do not know of any company that will repair an indoor coil (Evap). Just not smart money. They have to capture the freon, open the system, make the repair, ensure the correct level of freon is in the system, and most time, add a filter/ dryer for additional filtering and drying of the freon. With all that, no one is going to patch a leak on an old coil because if it leaks now, it's going to have another soon. You'll just be chasing leaks and spend money after money. Hope that makes sense. HVAC companys have to follow the EPA rules too. Leaving a system leaking above a certain percent of it's total charge is a major no-no. They will not do it.
Hope this helps clear up a few things and good luck.

Jul 11, 2008 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Heat pump not running

Depending on the age of the unit it could be several things, does it have a circuit board? Contactor could be bad, freon leak if it has a low pressure switch, burnt wires, connections, etc. Do a complete visual and check for 24 volts, does the indoor unit run? Transformer may be bad.... No indoor unit - no outdoor unit, most of the time the outdoor unit gets its 24 vac power from the indoor unit which runs them both, look for fuses (like car fuses)..

Apr 26, 2008 | Air Conditioners

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