Question about Weather King 12AJA4801AH Air Conditioner

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Weather King 13AJA36A01 AC freezing up at night

This unit works fine for air conditioning during the day but the compessor/heat pump (the outdoor unit) freezes up at night and the AC stops working. What's the problem? How can it be fixed?

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Check the inside coil is dirtyor may be low on freon

Posted on May 14, 2009

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Posted on Jan 02, 2017

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I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

We are in a 5th wheel RV. We have a factory installed Carrier a/c in the kitchen. Lately, it shuts off during the night and we have to reset it in the am in order for it to work. It works fine during...


If the outdoor temps are cooler than inside, AC's are not made for this and will not work well if that is the situation, it floods liquid to the compressor which will overload. will it reset within 20 mins of going off? if so the board/stat are suspect, if not the compressors the villain and its tired and cant handle the other than design condition of 95 F outdoor/80F indoor.

Sep 09, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Weather King Heat Pump Outdoor Unit, Model 10PJA3101. I noticed that the a/c was on and working fine inside but the fan was NOT moving on the outdoor unit. There are no tripped breakers or...


Hi,
If you are cool inside and the fan is not running then you are ok... I would however turn the temps. up a bit to eliminate more stress then necessary...
I am surprised that the fan is not working and you are still cooling though.
Was it a windy day? on a still day it may not work...
Are you sure the compressor was running but the fan not???
Some outdoor units do have switches that will turn off the fan if the head pressures are too low if the air temps. are low...

heatman101

Jul 06, 2011 | Weather King 10AJA2501AH Air Conditioner

2 Answers

Compressor freezes up at night and some during day.


You are being ripped off. The ambient (outdoor) temperature at night is low and therefore proper condensing does not take place causing the refrigerant to pool in the condenser and starving the evaporator. This causes a lower temperature in the evaporator resulting in "freeze up" which is often mistaken for a loss of refrigerant.
The proper thing to be done is to block off the condenser air causing the high side pressure to rise until the eqivillant of 110*F condensing temperature.
You can also install a low ambient kit which will cycle the compressor off when the temperatures fall

Jun 07, 2009 | Weather King 12AJA4801AH Air Conditioner

1 Answer

Is there a reset for the a/c unit itself


check for fuses in disconnect at the out door unit or a reset button where the copper line set goes into the unit at make sure stat wires have not been damaged hope this helps

May 15, 2009 | Weather King 10AJA4201AH Air Conditioner

1 Answer

I'm trying to figure out if our Weather King system has a heat pump... how do I tell?


Your indoor furnace is weather king? If you have a a/c unit outside, it could be a heat pump, but you have to provide the model number on it.. If you do have a unit outside, when you call for heat does the outdoor unit kick on?

Dec 03, 2008 | Heating & Cooling

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

1 Answer

Weather King 13AJA36A01


This seems to be more a civil issue than a mechanical issue. I would simply talk to the neighbor about your concerns. Maybe they are aware of the problem and already have a plan of action.

On a mechanical side, all A/C's are going to be noisy. Some are louder than others. There is really nothing that can be done about that.

Further, you can always consult a local building official to find out the requirements for the location of the outdoor unit. If the system is in violation (and installed after the law was activated), it could be moved to a better location.

Take care in your approach as you may not have to live next to the a/c for 15 years, but you will have to live next to those neighbors regardless of where the unit is placed for the same time.

Jul 03, 2008 | Weather King 10AJA2501AH Air Conditioner

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