Question about LG LSC121PMA Split System Air Conditioner

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Heat Pump won't cool house becuase outside unit won't stay on

We have a similar problem, but we have cleaned the outside unit and still have to reset and sometimes it won't start up even after pressing the reset button for over three minutes. When it does start up it works fine but it only works for a few minutes.

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  • damoshel Jun 14, 2008

    We have a LSZ122M split system and the "hot start" auto defrost will not allow the systemto kick off. It was working yesterday, the doors are closed but will not start, we have given it plenty of timeto start, but just will not start.

    Need help its cold here

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Depending on your ambient temperature and installation, it is possible that your unit has been overcharged with refrigerant which would cause high head pressure and cut out on the HP control circuit.

Posted on Mar 05, 2009

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Posted on Jan 02, 2017

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2 Answers

I have a 4T residential heat pump on a 2300 sqft house. The unit will run all day and keep the house nice and cool. then around 5 - 6pm when the outside cools down the unit stops cooling but stays on


I can't answer your question. I just wanted to mention a slightly different way of looking at things. Manufacturers increasingly over the last few decades tend to be accountant -led and therefore very concerned with profitability. This means manufacturers do not make things better than they absolutely need to be, taking into account the projected market price and that of competitors.

These days equipment is built down to a price and possibly a target weight/size and to be capable of a certain duty cycle. The duty cycle of some domestic equipment is appallingly low and even versions aimed at a business market is surprisingly low.

Industrially rated equipment tends to be the only equipment that is designed and built for a 100% duty cycle. It would be reasonable to expect any equipment that is designed and built for a 100% duty cycle, regardless of the destination market, would cost at least as much as industrially rated equipment. Domestic equipment is often considerably cheaper than industrial or business equipment and the lower price tends to manifest as a reduced duty cycle and/or a reduced lifespan.

It could be wise to adjust your expectations somewhat...

May 28, 2017 | Heating & Cooling

1 Answer

A/c on 3 ton 13 seer ruud heat pump not cooling


you have condenser issue. check at outside unit for 240 volts to contactor and 24 volts to contactor coil.

May 11, 2013 | Ruud 3 Ton Split System Heat Pump

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18 year old Janitrol Heat Pump freezing up.


i would get someone to check your refrigerant levels have you ever had the evaporator coil flushed and cleaned? proper refrigerant levels and proper airflow across coils are extremley important not to scare you but 18 yrs is a long time on a heat pump 9-12 years is the point where they really loose there efficiency going for a newer one would probably cut your operating cost in half if not more depending where you live there are a lot of people not familiar with heat pumps so i suggest finding a company that specializes in them to service your unit

Jul 30, 2009 | Ruud UBHC Air Conditioner

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Have Rheem 5 ton heat pump with stacked coils poor cool.


If your sure on the psi your low on freon or your evaporator is restricted discharge psi would realy help.you will get best performance with a clean unit or pay expensive utility bill . Tom

Jun 18, 2009 | Ruud Central System Air Conditioner

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Heat pump not cooling after 1 hour


Yes it is true . Sound like you are low on freon the unit is shutting off on the low pressure switch or high pressure switch is the outside unit clean ?you may need service. Tom

Jun 17, 2009 | Carrier CARH09K Air Conditioner

1 Answer

Fan running constantly in the house


Check t-stat and make sure fan is set to "Auto", that might be why fan is running all the time, or it could be a fan relay that is stuck closed. It sounds like you A/C is over charged or you have a bad high pressure switch, this was a common problem with this manufacture especially in the heat mode.

Apr 24, 2009 | Ruud Central System Air Conditioner

1 Answer

Thermostat setting


what i would do is see if the outside unit is working at all. when you first turn it on the air was warm due to the fact that the temperature inside was cooler than the set point. when it get within 2 degrees the unit shuts off the backup heat and your running on the hp alone. with both stages at the same temp you are running the hp and the electric heater and that can become very expensive. What I would do is make sure that the filters were clean and look at the outside unit and see if it has a red reset button on it, if it does reset it and see if the unit runs. If it doesn't then you need to call a quallified service person out to take care of the problem.

Dec 16, 2008 | Weather King 12AJA6001AH Air Conditioner

1 Answer

Non-working outside unit


If your unit is blowing heat inside and it's not a heat pump. It will be most likely electric heat in your case.
Sounds like you have a split unit meaning the condenser is outside and the cooling and the heat features are inside or under your home.If your Rudd is a heat-pump the outside unit will cycle/blow cold air outside in winter and hot air will cycle/blow outside during the summer season. Now, if for some reason the heat  is not coming on inside the house, would be the only reason that you would need to be concerned. Being a heat relay or breaker of could cause that problem. Hope this helps you, Sea Breeze 

Oct 27, 2007 | Ruud UBHC Air Conditioner

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