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Old 08-26-2011, 07:41 PM   #16
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Lennox 12ACB48 - Help


Can these things be checked when the compressor is working properly? I sprayed water on it and it is working fine now.
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Old 08-26-2011, 09:23 PM   #17
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Can these things be checked when the compressor is working properly? I sprayed water on it and it is working fine now.
Sure. Most of those things need the compressor running in order to check them.
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Old 08-27-2011, 08:57 AM   #18
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I would bet good money that the txv screen is dirty. You would need the tech to come out again to diagnose this.

Can I clean the screen myself? I assisted with the cleaning of the coil so I know my way around the Air Handler. Where exactly is this screen located?
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Old 08-27-2011, 11:10 AM   #19
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The screen is in the refrigerant system. A tech will have to do it for you.
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Old 08-27-2011, 04:45 PM   #20
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My uncle came over and added a hard start kit. We are also going to replace the run capacitor next week.

I will check into the TVX screen.
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Old 09-14-2011, 05:45 PM   #21
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Well I just came home and it quit again. Fan was spinning but compressor was not running. Where to look now?
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Old 09-14-2011, 05:50 PM   #22
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do you have a meter with a continuity (ohms) function? I'm willing to bet that the compressor has open windings meaning it's shot.
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Old 09-14-2011, 05:51 PM   #23
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Yes I believe I do.
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Old 09-14-2011, 05:52 PM   #24
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Lennox 12ACB48 - Help


How do you know the compressor is off?
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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
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Old 09-14-2011, 05:53 PM   #25
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How do you know the compressor is off?

outside unit not making as much noise and the freon lines are hot, not cooling. im just guessing i really dont know.
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Old 09-14-2011, 05:56 PM   #26
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So i just turned the system off for about 20 mins. I just clicked it back on and the air handler starts up but the outside unit is just buzzing, the fan is not even spinning now.
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Old 09-14-2011, 05:58 PM   #27
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Yes I believe I do.

Well it might only have the thermal overload switch open in it if it got too hot. Without doing anything to any wires run your water hose on the condenser, mainly on the compressor for a good ten to fifteen minutes.

If it was running and got too hot then running water over the compressor will cool it off enough to close that switch which is internal versus being a reset button someone can simply push.


if you don't run water over it you're looking at a possible 4-6 hours for it to cool off on it's own.

again, this is only one possibility, that the thermal overload is open.


try that and if it doesn't come on than I'll walk you through how to test the motor with continuity.
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Old 09-14-2011, 05:59 PM   #28
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Well it might only have the thermal overload switch open in it if it got too hot. Without doing anything to any wires run your water hose on the condenser, mainly on the compressor for a good ten to fifteen minutes.

If it was running and got too hot then running water over the compressor will cool it off enough to close that switch which is internal versus being a reset button someone can simply push.


if you don't run water over it you're looking at a possible 4-6 hours for it to cool off on it's own.

again, this is only one possibility, that the thermal overload is open.


try that and if it doesn't come on than I'll walk you through how to test the motor with continuity.

The water trick, has worked the last 2 times. I will go do that now.
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Old 09-14-2011, 06:08 PM   #29
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OKey dokey, water did it. It is cooling again. This is now the third time this has happened. So far we have cleaned the coil, charged the system and put a 5 2 1 hard start kit on it. What else should we do?
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Old 09-14-2011, 06:11 PM   #30
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So now we know that your comrpessor is getting too hot which means the refrigerant levels need to be checked and the condenser coil needs to positively be cleaned. That and the evaporator.

I'm not suggesting that the windings aren't weak and the compressor is not on it's last legs as that very well could be the case (although the thermal overload switch is there to protect the compressor) but these are the reasons compressors go out; lack of air flow (restriction/dirt) through the inside (evaporator) and outside (condenser) coils and or refrigerant problems which stem from lack of air flow or leaks.

I'd sure like to know the pressures on that thing once it's running for about twenty minutes. I don't take it you have a set of refrigerant gauges, do you?
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