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Compressors on lsn240ce willnot start - Heating & Cooling

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Call a tech might need a hard start, if that doesnt work needs a new system

Posted on Oct 16, 2008

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My Whilrpool AC Model number ACM102XJ0 fan is blowing air but it's not cooling.


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Many times I can get the compressor started again without having to buy a new compressor by using the device known as a "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor


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Aug 01, 2011 | Heating & Cooling

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Hard Start Capacitor A hard start capacitor, its only purpose is to add...



Hard Start Capacitor
A hard start capacitor, its only purpose is to add additional starting torque when the compressor is starting and for just a few milliseconds.
It is wired thru a normally closed set of points in a potential relay and in parallel with the run capacitor, when the compressor is starting the start capacitor is in the circuit adding additional starting torque to the compressor, when the compressor reaches a certain speed it generates enough back EMF (voltage) to energize the potential relay coil and open the normally closed set of points and take the start capacitor out of the circuit and then will stay open, keeping the capacitor out of the circuit as long as the compressor is running. The hard start capacitor is only in the circuit or working for a few milliseconds, it’s not doing anything once the compressor s back EMF opens the potential relay coil.
These potential relays have different cut in and cut out voltages, so the same relay won’t work with any compressor and may actually damage the compressor or shorten its life if you don’t use the right potential relay. The compressor manufacturer and the local parts store list the correct capacitor, start relay and start capacitor for every compressor and now they are putting the information on the compressor on the nameplate with the model and serial number.
As a rule of thumb you can use a capacitor or start capacitor within 10% of its rating if you can’t get the correct one.

on Feb 17, 2010 | Heating & Cooling

1 Answer

Carrier ac model 38ckc does not cool properly. Outside unit runs but air coming out of the top is cooler than the other units that we have. Just had a service replacing all the filters and coolant checked...


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor by using the device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor

Jun 20, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

My compressor is not turning on the fan is going but the compressor wont kick on what could be wrong it was working fine just an hour ago


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor using a device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor.

Jun 20, 2011 | Goodman CKL36AR36 Air Conditioner

1 Answer

My fan willnot start on it's own,if i give it a spin with my finger it works fine cool air untill unit shuts off,then it will not start again when camper heats up


It sounds to me like you will need to replace the start capacitor. If your fan motor doesn't have a external capacitor then you will need to replace the motor. Thank you,t

Apr 07, 2011 | Coleman Mach 15 Air Conditioner

2 Answers

New copeland compressor wont start


Hello,By all means install a hard start kit on the cap.Your wiring is correct.A scroll compressor usally doesn't need a start kit but I have seen 5 ton units that take one.Check the compressor tag and make sure the compressor is not a 3 phase motor!

Apr 21, 2010 | Heating & Cooling

3 Answers

Please help our ac compressor wont come on


Hi, did you change, capacitor for compressor too. check compressor overload switch,(relay) normally located on compressor terminals, (where you connect wires to compressor) that's the device that goes klix when compressor goes to start, could be faulty, or maybe low voltage from your mains(house panel) check line voltage, with digital volt meter, some compressor won't start if voltage drops to low, yes fan will work, could also be, your compressor has a lock rotor, (hard start), you can buy a compressor hard start kit, from appliance store, and try to start compressor, or maybe compressor internal winding, are damage, especially now in summer, when you got a lots of voltage drops, check compressor winding, check compressor winding for short circuit, remove cover on compressor, remove 3 wires from compressor terminal, use ohm meter, put one tester lead on copper tubing that's connected to compressor, and next lead to compressor terminal, one by one, if you get beep (continuity) from anyone of those compressor terminal, you got a short- circuit in compressor, you will have to replace compressor, but if there's no short, them try hard- start kit, replace overload relay, you will see it at compressor terminal location, after you remove cover. good luck.

Aug 10, 2009 | Heating & Cooling

2 Answers

The compressor on my home ac willnot kick on


The fan and the compressor both run off of the same circuit. Have your husband remove the cover on the condenser coils and check for power at the leads that go to the compressor off of the latching relay. If there is power there, then he needs to check the start capacitor or possibly the thermal overload switch (mounted on side of compressor)

Jul 11, 2009 | Heating & Cooling

1 Answer

Air Conditioning


Is this a 110volt unit or a 220 volt unit? Is this a central or window unit? but the way you describe the cleanning, must be a window unit! there is suppose to be 2-sounds from this unit ,,,1--the fan blowing sound,,,,2---the compressor humming sound.! the compressor kicks in by the thermostat control knob, turn this to the highest setting &listen for the compressor to kick in. if not the compressor is not pulling in..(burnt wire, bad capicator, locked compressor, bad thermostat switch, ) but don8t let that scare you, just have someone to check it out,,or let me walk you through the troubleshooting process,@ koolbreezes74401@yahoo.com... did anyone tell you window units are called the"throw-a-way " type?

Aug 21, 2008 | Hampton Bay Heating & Cooling

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