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What part failure causes trane xl1400 to ice up?

During cold weather my outdoor condensor unit will ice up. Which defrost part is most common to fail causing unit to ice up? I've been told there are 3 parts to the defrost cycle - circuit board, thermostat and sensor. Which is first to replace to troubleshoot? Thank you.

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Posted on Jan 02, 2017

SOURCE: fredrick heat pump p-tac window unit

need thermostst emerson quiet kool a c

Posted on Nov 15, 2007

  • 182 Answers

SOURCE: Copleland scroll compressor failure

Make sure ALL moisture and noncondensables are evacuated while the system is down.I would have the line flushed to remove all remnants of burnout.Actually with the age of the unit and amount that needs repaired I would change the unit out to a 410a system and start over.

Posted on Nov 02, 2008

meBNme
  • 334 Answers

SOURCE: hello i have proble with air conditioner and heater is a split system unit

What its telling you is that there is an outdoor "thermostat" that senses the outdoor temperature.
The system has found a failure on this area.

It is telling you to check the sensor to see if its actually the sensor thats bad, or something else.

Then its telling you to check the wiring and connection of the sensor to the control board for any loose wiring or broken connections, and to repair it if so.

It then says if niether of those two checks reveal any problems that the problem is the board itself and it should be replaced.

To answer the question, resetting it probably will not work.
There is a small chance that due to power surge, flickering lights, or just a fluke one time glitch that there is nothing rally wrong and resetting would work.
95% chance that is not so.

Posted on Dec 10, 2008

louislevel_2
  • 374 Answers

SOURCE: burn out circuit board

hi! there! replace the burn out circiut board,what ever you pull out the same thing you put back just be sure that has the same model and specification,calibrate and test overload protection,defective overload protection replaced to prevent any burn out,short circuited mostly came to burn those thing that's why imposing preventive maintenace schedule for this kind of large ac central unit is very much significant.mostly timer delay circuit malfunction on large scale unit supplying by three phase a/c source on central control panel board.when ever replacement occured try to put mark or list color coding of specific terminals to connect and isolate short circuit make possible to detect at once before installing the new one and make make record on this for future reference we have several cases like that after buying a new one and replaced still burn again,the common cases is that they did not find the cause of short circuit connection they just relay on circuit board burn out,so it better to make assured that every thing is fine before installing the new one.specially on supply source of circuit.,relay on diagram and manuals take and check all data source as reference this will be a great help.take all necessary precaution this should be done by qualified technical ac support,have a nice day and regards

Posted on Mar 31, 2009

bobicehouse
  • 1524 Answers

SOURCE: Zoneline PTAC heat pump problems

Typical for those units

Posted on Apr 23, 2009

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2 Answers

Brand New 2 weeks old 4 ton Trane compressor leaks a lot of water onto pad


If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.

The video gives you an example of the defrost cycle!
2012 Trane XL15i Heat Pump Defrost Cycle Steam Show

Dec 21, 2015 | Heating & Cooling

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Coil icing up


make sure the filter is very clean. make sure all supply grills are unblocked and open. make sure the indoor fan is blowing. icing coil is normal during heating mode the system will defrost using a sensor. sometimes during cold wet weather the coil will stay iced up. sometimes in cooling mode when it is cool outside 60 degrees or less the coil will ice. low freon will make the coil ice up ,also defrost control not working will cause the coil to ice up

Sep 06, 2013 | Goodman PHKJ048-1 Air Conditioner

2 Answers

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

The refrig on my trane xl1400 unit is not getting cold...the fan runs and I do not see icing?


compressor is either not running or out of freon, need to verify if compressor is operating by removing access cover's and using an amp probe clamp, verify that the compressor is operating, if not check electrical connections and capacitor which is required to start and run the compressor. Capacitors have more common failure rate than any other component.

Aug 23, 2011 | Heating & Cooling

1 Answer

My unit is not defrosting, i guess its a timer issue not defrosting often enough when it is very cold out?


The unit must defrost regularly when icing conditions occur and long enough to get rid of the ice and short enough to not waste energy. There is usually a best place for the sensor or thermostat on the outdoor coil just after the metering. Some manufactures have a tubing stub for the thermostat and others a well. If you remove or change the sensor try to mark where it was. Failure to place it in the correct place will cause the unit to either not defrost or the cycle will be too short and the unit will build ice anyway. Place it at the wrong end of the coil and you will get no defrost activity. When the compressor runs the clock runs and time is accumulated. At the selected intervals the clock will energize a defrost event through a thermostat or a sensing bulb, If the temperature of the sensor (refrigerant filled sensing bulb on the Ranco E-15) is below 28 degrees F. the defrost will take place. When the temperature of the sensor rises to 50 or 70 degrees F Or 10 minutes elapses the defrost cycle is terminated. A typical defrost cycle should be from 1.5-3 minutes.

Dec 28, 2010 | Weather King 12AJA4801AH Air Conditioner

1 Answer

My heat pump is frozen up today and it is 60 degrees outside and I have my heat set to 66 degrees. Is this normal?


You post is not clear as to where the freeze-up is occurring. I'm going to assume the outdoor unit is frozen up.
Heat Pumps don't generally freeze up at 60 degrees. If the ice around the unit has an uneven pattern (for example a thick spot around the center or at the very bottom) could indicate a low refrigerant charge. If the ice is even throughout, it may be one of the following:
*Sticking Contactor*.....turn the system off at your thermostat and check to make sure the unit outside shut off. If it doesn't turn off, it is likely to be the contactor.
*Failed Defrost Thermostat*.....if the defrost thermostat fails "open", the system will never go into defrost.
*Failed Defrost Control Board*......this could also prevent the system from going into defrost
*Failed Reversing Valve*........put your system in COOL mode and check to see if it will blow cold air inside approx 16 - 22 degF lower than room temperature.
*Failed/Failing Condensor Fan Motor*.......ensure the condenser fan motor is running during heat and cool modes. The condensor fan motor will not run in OFF/Satisfied Mode or in Defrost Mode.
I hope this helps. Good Luck! :-)

Mar 05, 2010 | Heating & Cooling

2 Answers

I just moved into this home and am wondering what EM heat is compared to just Heat and my outside unit is full of frost what do I need to do?


Hi, EM stands for emergency heat. You should only need to use it if the outdoor unit does not operate. You have what we call a heat-pump. If the outdoor coil is iced up, it should go into a defrost cycle to melt away the ice. You will know when it does as you will see steam coming up from the unit as though it is on fire. The outdoor fan will also shut down during this process. These units will defrost using time and temperature to defrost the coil. If the ice continues to build-up, and does not defrost every couple of hours, I would say you have a faulty defrost board or defrost thermostat. There is not alot you can do as these are very complicated systems to work on. You will more then likely have to call out a service tech to check this outdoor unit for you.It also should have heat strips in the outdoor unit for EM heat if the outdoor unit fails. If it is iced up it is on and running. Thats what I would do is keep an eye on it to see if it does defrost, and if not, you will need to get a tech out to check it. It takes special equipment to check these units. Please keep me posted.
Sincerely,
Shastalaker7

Feb 01, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a 20 year old Trane heat pump. Outside


Yes, you will want to put the unit into cooling mode to help assistance with the ice melt.

If you can, block off the outdoor coil or disconnect the outdoor fan motor. This will assist in raising the discharge pressure and temperature and thus, it will melt the ice quicker.


Or, if you have the capability, you can take a garden hose around to the unit hooked into hot water and melt the ice that way.




If your control board is messed up, why aren't you replacing it?

Jan 10, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Is it normal for fan on outside unit to be on while on heat mode


Yes, it is normal with a heatpump, you run the outside unit in cooling and heating.
It is also normal when the outside unit goes into defrost for the outdoor fan to shut off during the defrost mode and to see steam coming out of the outside unit, while it's melting the frost or ice, then the fan will come back on.

Jan 06, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

3 ton condensor and 2.5 air handler


I hate to use rules of thumb but 500sqft per ton depending on your windows and insulation. you are probably ok with a 2.5 ton however it will not work with a 3 ton outdoor unit as you have figured out. depending on how long that ac has been in you may want to replace it with a 2.5 ton due to the damage to the compressor valves because of the mis match. or if the indoor is newer and the original system may have been a 3 ton then i would replace the A/H. and be prepared to replace the outdoor if the valves are to far gone. If the trane is a new high effiency 2 and the goodman is just a 10 SEER you may be able to have a txv installed on the trane unit and a kickstart device outside. but only if its a high effiency but their again if the A/C fails you couldnt have a high effiency 3 ton you would have to drop down to 2.5,

Sep 22, 2009 | Heating & Cooling

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