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I have a 4 ton unit that the service tech just told me has a bad compressor, they just switched out the a coil last week because the pan was leaking, is this just a coincidence or could the changing of the a coil and expansion valve caused the comprssor failier

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Yes. if that expansion valve was improperly adjusted would flood the compressor with liquid freon washing out the oil causing compressor failure. Tom

Posted on Jun 17, 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

1 Answer

My split air conditioner,s compressor is not starting , whtat to do?

Check for obvious things like a blown fuse or open service switch near the condenser unit (the outside part). Make sure that power (most of these are 240V) is available to the unit. Please, do not work on live electrical equipment unless you are 100% sure of what you are doing. You don't get a second chance at these voltages.

On the thermostat, make sure the mode switch is set for cooling, the fan switch is set to on or auto and the temperature set point is set below the current room temperature. If a programmable type thermostat, make sure the time, date, and program are correct; or override to manual mode so that your settings are followed. Check the air handler to make sure that filters are not clogged with dust and dirt - if they are the unit may have iced over the cooling coils. If this has happened, replace the filters and allow time for the ice to melt off the coils. Many air handlers have large, shallow pans installed under them when located above a living space. This is to collect condensate that leaks out of the unit. A pipe will be connected to the pan to allow the pan to drain this condensate off to the outdoors. If the pan is full of water, the drain pipe is clogged and will need to be snaked clear to empty. Locate the float switch. The float switch monitors the water level of the pan, so once it is empty - the switch float arm should be resting on the pan floor - not in the up position (which prevents the unit from starting).

These are the most common home-owner correctable issues that will prevent a unit from starting - there are many others that require advanced skills and equipment to detect and correct. Some of these are: low refrigerant gas, bad motor, bad start / run capacitor, bad relay coils, bad transformer, bad thermostat, the list goes on and on.

If all these items listed above are ok, the unit should attempt to start. If the unit still will not start or buzzing sound is heard professional service is likely required.

Good luck!

Aug 20, 2012 | Air Tools & Compressors

1 Answer

I'm just looking for a 2nd opinion on whether or not I have a bad compressor or if it is just the starter relay on a 25HNA624A300 Carrier infinity unit. Just so everyone knows I have already hired an...

First, I would not advise anyone to use water around electricity!!!, And what you are doing by hoseing down the condenser coil is transferring more heat, what it sounds like is that the unit is to small for the space you are trying to cool, rule of thumb is one ton of air (12,000 BTU) to every 450 square ft of space. So a 16000 sq ft home would require a 4 ton A/C system.
Also, the unit will work harder in the daytime , during the hottest part of the day, because there is more heat load on the unit. Check your insulation in your attic.
Some other causes of this problem are low on charge, or a leak in your system, will also get worse as your system will go flat.
A dirty condenser coil, you can turn off Electricity to unit , spray down coil w/ 409 cleaner and hose off, then turn back on, a dirty coil will stop transfer of heat and make your system work harder.
A dirty air filter will also cut down on cooling, if you can't get air into the system, you can't get it out!!
Start w/ your filter, then wash your coil (outside coil) called the condenser, again make sure power is off first!!
If you still have a problem, call a service tech, preferably not the guy who told you to water it!!

Jun 14, 2011 | Carrier 38BRC036 Air Conditioner

3 Answers

Outside condensor compressor

Hi, and yes if this capacitor is getting hot enough to burn off wires, you are drawing to many amps at your compressor causing this. Did the old capacitor you replaced leak any oil, or was it swollen and deformed? I have seen a compressor last less then 6 months. If you had a amp probe the clamp around, you could check the running load amps, (R. L. A. ) at each leg of the compressor to see what each one was pulling. Like the R terminal, 11.8, C, 9.7, and the S or start, 8.9 amps and compare it to the data plate on the outdoor unit which tells you what it will be, like 21.7R.L.A., just a guess on yours. If it was much higher, you would know you have a problem. Whens the last time the outdoor coil was cleaned?? It should be cleaned every year as the head pressure will build in the system putting a load on the compressor and will cause these kinds of problems. Before I would condem the compressor, kill the power and take your water hose to the coil and give it a good washing. If dirty, it could bring the internal head pressures down by 50 p.s.i.! Do this to see if it takes care of the problem.If you had a service tech out to replace the cap, he should have put his manifold gauges on it and cleaned this coil for you. Be careful not to bend the aluminum fins down with to much pressure. If this is a dual run cap, it would be for the fan and compressor. It will have 3- sets of 3 to 4 spades coming out the top, 3 in a row marked Fan, C for common, and Herm for compressor. With a dirty coil, it will also cause this fan to run to hot and take out the capacitor. Do this for me and I believe this will solve the problem if the fan and compressor seem to be running quite and cooling good. Keep me posted on this. My gut tells me its a dirty coil causing this problem. Please be kind when rating me, that would be nice of you. I will be here if you need me.
Sincerely, and have a great 4th,
A/C & Heating Contractor

Jul 04, 2010 | Goodman CLQ36AR49 Air Conditioner

2 Answers

Compressor kicks out and it's new

First of all, clean your outside coils so that you are assured of good cooling air. The compressors have an overtemp device that is usually internal to protect them against heat. If you have an air compressor use it to blow out the coils good. If the compressor will start, the capacitor is good so it sounds like a cooling problem with the compressor

Jun 25, 2009 | Ruud UAMB Air Conditioner

2 Answers

Need to replace 3 ton compressor

Depending on age of the unit. The compressor amy under warranty. The replacement is something that should be done by a service tech. You have 3,5 ton unit Rus

Jun 14, 2009 | Ruud UAKA042 Air Conditioner

3 Answers

I have a 2006 dodge pick-up with a 5.9 deisel . My

Compressors do go bad, and if the clutch goes out, you are better off getting the whole thing replaced. Make sure to check for leaks. They are bad about the evaporator core leaking.

Jun 04, 2009 | 2006 Dodge Ram 2500

1 Answer

Oil Leak

This would indicate a leak somewhere in the condenser sheet coil. I hate to be the bearer of bad news but you should call a service tech in to fix this problem.

Aug 29, 2008 | GE Zoneline AZ38H12DAD Split System Air...

1 Answer

Compressor went out on 4 ton unit. want to upgrade to 5 ton A/C. Have been told need bigger blower unit. Can I exchange to blower unit that will handle 5 ton A/C?

Hi mans1930. You need to replace the whole inside blower unit, the coil as well as the blower. If not, there would be a very good chance of damaging your outdoor unit, namely by ruining your new compressor.


Aug 18, 2008 | Heating & Cooling

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