Question about Amana PTH123B25AJ Heat Pump Air Conditioner

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Having problemswith units costanly cycling off and on with the heat turned on

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  • jay_peters Dec 04, 2008

    not bad thermostat.......outside air vent open closed it they are fine now

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It has a bad thermostat----replace it

Posted on Nov 27, 2008

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When I turn it on to the heat cycle the fan does not run, I have swapped the control board with another unit that was working and still get the same result the unit runs on all other cycles.


This is not true if your system is a heat pump. When the thermostat calls for heat, and the burner ignites the gas, a thermal sensor switch senses when the hot box has heated and then the sensor turns the fan on, this is so no cold air is blown into the ducts and living space. Also, another sensor senses the heat box if it gets too hot, cuts out the burner, if this sensor is not working then the burner will never light. Two sensors that may be keeping the heat from working among other possible causes, one step at a time in trouble shooting. Does the burner turn on at all?

Apr 25, 2015 | Air Conditioners

1 Answer

Senville mini split displays a "defrost" symbol????


It's a heat pump and that is how they work. But it shouldn't be cycling so much unless you live in Minnesota? The colder it is outside the more chance that the outside coil will freeze so it will go into defrost. It may be low on charge or have leak as well. Call a tech to verify.

Apr 13, 2014 | Senville 18000 BTU Ductless Air...

1 Answer

Hi, I have an LG artcool A09AHD aircon unit and after a while on the heat cycle, the unit stops and shows a circle with a snowflake and a waterdrop within the circle. Does anybody know what alarm tjis is?...


This may just be the defrost cycle for the outdoor unit. In the heat mode, the outdoor unit builds frost on the coil. The outdoor unit senses how much frost has built up on the coil and reverses the refrigerant cycle to allow the outdoor coil to warm up and defrost it. After a short period, the unit then restores itself to the heat cycle. This is normal operation and nothing to worry about. During the defrost cycle, you may feel some cool air inside your home.

Oct 26, 2013 | LG Air Conditioners

1 Answer

I have an armstrong heat pump and am curious about how the defrost cycle works.


Rather lengthy but here it is.
The outside unit(heat pump) has a reversing valve, a defrost board, a crankcase heater, a metering device(txv or piston) and an accumulator. This is what makes it a heat pump instead of a straight air condensing unit.
When in the heat mode the outside unit becomes the evaporator and the inside unit becomes the condensing unit.Before somebody corrects me i am just stating what is different in a heat pump.
When the system goes into defrost several things happen. First the system has to call for a defrost cycle. This happens on a time and temperature sequence. When the defrost board times out for a defrost check(the defrost board has a jumper pin to determine how long before the system will check for a temperature(thermal switch) is open or closed. This switch is in the normally open position. It will close at 35 degrees(depends on the switch). This switch is located on the copper line in the condensing unit. If this switch is closed then the system will go into defrost. Now for the good part. This will shut down the outside fan, switch the reversing valve, and the outside unit will essentially go into cool mode. Because the fan is off the compressor will heat up very rapidly and the refrigerant passing thru the coils will be hot as well. This will cause the ice buildup on the outside unit to melt(defrost). This will continue until a temperature is met or it times out. Then the system will return to the heat cycle. One other thing, depending on how your system is wired the inside unit will turn on the auxillary heat while the defrost cycle is in process. That way you will still have heat while the defrost cycle is in process.
It is not uncommon for steam to come out of your outside unit while this is going on. It can also be quiet noisey sometimes.
Hope this explains what you wanted to know. If not just reply to this with any other question you have about the cycle.

Sep 14, 2011 | Air Conditioners

2 Answers

I'm not getting heat from my unit..


the compressor is controled seperately from the fan, this is done with the thermostat, try turning the thermostat on then of or untill you hear the "click" sound from the thermostat. If the compressor is still not turning on this may be more than you can fix if your not familiar with electrical hvac troubleshoting... more than lilkely the thermostat may be bad, or your compressors starting components are failing...if the compressor is comming on when the unit is turned on you could have a freon leak causing no heat. hope this may help some there is just too much to write on the causes this will give you a start though!!

Jan 17, 2010 | Amana PTC153B50AM Split System Air...

1 Answer

Heating problem


the tstat sounds like it is not connecting the white and red terminals which is usually the heat cycle if it is a gas furnace if so to check I take tstat cover off and jump white terminal to red terminal this is the standard heat position the unit should fire the heat cycle if not a gas funace let me know what type of unit you have hope this helps

Jan 11, 2009 | Air Conditioners

1 Answer

Noisy defrost cycle thumping


The heat pump works like this. Your outdoor units are now your evaporator, meaning that now they get cold, they will build a layer of ice and they will need to go thru a defrost cycle, either iniated by time or temp. When the cycle starts your system actualy switches back into cooling, turns off your outdoor fan, and brings on your heat strip. The noise you hear is either you reversing valve switching or the ice being melted, then being sucked back into the fan when your unit switches back into the heat mode.

Nov 16, 2007 | Air Conditioners

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

1 Answer

Amana PTH153B35AK


This often happens if the unit is oversized or to close to a wall or object.

Feb 14, 2007 | Amana PTC153B35AK Air Conditioner

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