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A\c unit This a\c unit does not cool at all, the compressor does cut in

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  • g2nj Jul 22, 2008

    How do i check pressures and how should the thermostat be checked.

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It cold be different problems.
1-check for any air leaks around the house.
2-check the return box and see if have any opening and seal the holes.
3-check the insulation on the attic or any motor that takes the heat out the attic.
4-check if the unit is under tonage each tonage mean a 400 sf per ton.
5-check if the air handler coil is not dirty and enought air going thru the coil.
6-check the pressure of the condenser unit if have the rigth presures.
7-check thermostat if is set-up right.

Posted on Jul 22, 2008

  • Giovanny Mejia Jul 25, 2008

    To check pressure you need a gauge for r-22 or other refrigerant. regular pressure will be 70 in the low side and 250 in the hight side.



    To check thermostat you need to disconect the red wire and the green together them the unit inside will come on and put together the red wire with the yellow and the condenser unit will come on if they dont come on with this test the thermostat not working properly.

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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

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1 Answer

Coleman compressor runs no cool


Sounds like a blockage, which isn't permanent and let the unit cool the other day. Reclaim the gas, cut the capillary at the drier end and blow nitrogen through. Rebraze the capillary, vacuum and put new gas in.

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1 Answer

Compressor cuts out after 20 minutes then restarts after maybe 20 minutes


This is usually due to low limit or high limit cut off switches. Basically when it's low on refrigerant the unit cuts out to protect the compressor. Then after 20 minutes the pressure equalizes and the unit kick back on, or the opposite for the high limit switch.

Feb 10, 2011 | LG LS-K2430HL Heat Cool Mini Split Air...

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We installed a new TCJD36 (3 TON) unit with new A coil. The unit works fine from morning until 4:30 PM. from 4:30 PM to 9:00 PM the compressor does not come on. Inside fan goes on and outside unit fan...


This really sounds like the unit is over heating the compressor to the point of triping the internal high limit switch and just taking that long to cool off before it resets. If it continues to do this go outside and run your water hose over the compressor for at least 30 minutes to cool the compressor down and see if it starts for you then. If so then your unit could be over charged and creating very high head pressures!

Aug 11, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Unit does not cool. Original unit was replaced because of defective compressor. Replacement unit worked in store but now does not cool and alternates blowing cool and warm air.


Is this a window unit? Sounds like the compressor may be cutting on and off. That would cause the alternating air temp you are feeling. Make sure the condenser fan is running. If it isn't running head pressure will build up on the compressor until it shuts down. Then the pressure will equalize and the compressor will kick on again. Also check your filters and the condenser coil to make sure it is clean. Let me know what you find.

Jul 08, 2010 | Frigidaire Heating & Cooling

1 Answer

External unit noisy


Sounds like bearings are out on the compressor. I'm assuming that it's not the fan motor making the noise, cause if it was - and the fan motor is cycling on and off - it (fan moter cycling on/off) will also cause the compressor to cycle on and off.

But, since you say it's the compressor (from which the noise is coming from) I would have to say the compressor's bearings are out and since it's a hermetic (sealed) compressor - your only option is to have a service tech check it out to be sure.

Note: I think you are correct (in thinking) a thermal overload is cutting off the compressor, because the compressor does have a 'saftey overload' built internally in the compressor just for that reason.

good luck!

Apr 26, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

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I have a 10+ year old Kenmore side by side that quit cooling


the starter unit of the compressor can be bad EZ fix if it is that...its the element conected to the compressor :)

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1 Answer

Amana BX21VW cool but not cold, compressor not working


How to check stuff>
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

. Cut everything off for a few minutes then turn it back on and listen for a click from the compressor relay as the compressor tries to start.
Is the compressor motor running.If no check starter/overload relay.

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1 Answer

AC Unit is not cooling.


hi...
Every air conditioner has a motor called a compressor. The compressor provides the cooling capacity for the air conditioner. If the compressor or its electrical controls are defective the compressor may try to start, fail, and create an electrical overload. If the unit does create an overload, every compressor circuit is also equipped with an overload safety switch. The safety switch is designed to protect the compressor from burning out. The safety switch will cut the power to the compressor for a certain length of time and then reset itself. When it resets it will allow the electricity to flow to the compressor once again. If the compressor then starts, the unit should function normally. If the compressor doesn't start when the overload resets, the overload will again cut the electricity to the compressor. This cycle will continue indefinitely. (Always allow three to five minutes before restarting the compressor.) If this situation is occurring, unplug the air conditioner and get help from a qualified repair technician. This problem is often fatal to the air conditioner because the cost of repair often exceeds the price of a new air conditioner...

hope this will give u a clear idea..
thank u
rate me!!!!





Aug 24, 2009 | Heating & Cooling

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