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How do we prevent the Air conditioning units from the corrosion especially the fins/ coils/ and the body?

Mitsubithi Split Units

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Ice on the coil fins of my Window AC unit......

set your unit to fan mode only, to thaw the ice, after the ice melts, look at your evaporator coil, see if its dirty, if its dirty, then you might just need a good cleaning. if the coil is clean, look at your thermostat setting. it should not be all the way cold. the compressor would run continously and it would freeze the coil. third, the refrigerant system could be partially clogged up or it lacks refrigerant. these problems initiate freezing of the coil.

Posted on Feb 19, 2008

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SOURCE: fan coil unit won't cool or heat in room1 while room2 runs well

could be undercharged, or overcharged, or wires weren't put back on valves in unit.

Posted on Feb 16, 2009

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650btu/square meter

Posted on Mar 25, 2009

  • 1 Answer

SOURCE: WA 903 and WA 10000 Portable Air Conditioning Units
Here's a link to the manual.
Hope this helps.
Regards, Davy Wedding | Event | Lifestyle

Posted on Feb 26, 2010

  • 674 Answers


The leakage is probably from condensation and there should be some sort of drain for it. You should check to see if it is clogged or partially clogged. Also since you say it does it when it hasn't operated for a while you may want to check out where the lines pass through the wall and make sure that it is sealed up there so you don't get leakage from out side.

Posted on May 04, 2010

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Air conditioner runs constantly how can I fin the problem

If the picture you show on your post is that of a Mitubisi mini-split or other mini-split a/c unit...then it is supposed to run constantly. Believe it or not that's how they provide the most efficient a/c output (28seer) in the industry. A/C units pull the most power during start=up. A mini-split never turns off it just runs on low with a variable speed motor.

May 11, 2015 | Heating & Cooling


Cleaning Air Conditioner Condenser Coil with Pictures

The most important Air Conditioning maintenance that needs to be done every year is the cleaning of the condenser coil. Doing the job of cleaning the A/C coil is the best way to make sure that your air conditioning system is working efficiently and giving you the best performance possible.

The tools needed to do the air conditioner condenser coil cleaning will be:

Garden hose with nozzle
Garden pump sprayer
Condenser coil cleaner (can be purchased at HVAC Supply houses, or many hardware type stores)
Hand tools needed to remove condenser fan

To do the job correctly you will need to first turn off the power to the unit and remove the condenser fan.


Once the condenser fan is removed then, you should wet down the condenser fins with a garden hose. Use nozzle that will give you a high volume spray but not with high pressure. Too much pressure will bend the fragile fins and cause them to shut off the ability of the air to flow through them, this is want you want to avoid. You want it to be as easy as possible for the air to get through the fins, for the best possible heat exchange.

After wetting the fins, you then will need to spray the fins inside and out with a foaming coil cleaner. Make sure to wear eye protection and hand protection. If you have sensitive skin, you may also want to wear long sleeves to protect exposed skin. I buy it in a concentrated formula then dilute it with water to the proper working formula. You may need to go over the fins a couple of times with the coil cleaner to get it worked into the fins. Allow the coil cleaner time to work the dirt loose and boil it out of the fins.



After about fifteen minutes start to rinse the coils with fresh water. This will take a long time and lots of water to fully rinse the coil cleaner from the fins. It also is very important that you get everything rinsed fully. Failure to do this will result in excessive dirt accumulation and also can cause corrosion. Make sure that the water is running clear and that all bubbles are gone before stopping your rinse.

Then reassemble the condenser fan, turn on the power, and check the operation of the unit. It is okay to run the unit immediately after washing it. The water will not hurt the unit.


You now will have an Air Conditioning unit that will give you the best possible performance!

on May 15, 2011 | Heating & Cooling


Lower the cost of your Central Air Conditioning Bill

Dirt is the enemy and your defense is simple and inexpensive.

Central air conditioning units are simple machines which take the warm air from inside your home and put it outside. There are two parts that do the bulk of this 'Heat Transfer", they are the inside coil and the outside coil. A coil that is covered with dirt does not transfer heat very well.

The outside coil is the outer layer of the unit located outdoors. First, shut off the power to the unit. Clear any weeds or decorative plants away from the machine. The machine should have a good 18 to 24" of clear space around it. More is better. If possible, nothing but blue sky should be above the unit. Although there are special detergents used by commercial contractors, I have found that in most residential locations, using a simple garden hose to wash the spaces between the aluminum fins is adequit. If you find that the fins are blocked, you should have a professional coil cleaning. While you are at the unit, take the time to straighten any fins that are bent over. Again, if a large area is bent and you find that you are damaging the fins, call a professional as they have special tools.

The inside coil is not so easy to access. For this reason, a high quality indoor air filter is recommended. Many people use carboard encased fiberglass filters, which cost about $1.00 each. Much better to go with a pleated media filter, even better, one maked high efficiency. Change it whe the surface is covered with a fine, even layer of dirt. Some homes will require monthly changing, most will need it every 3 months and a few will only need it once every 6 months. The Glass Fiber filters only catch the very big pieces, allowing the small particles of dust to flow into you indoor coil. WHile operating in the air conditioning mode, the inside coil is wet. This is because part of the process of removing heat involves removing humidity. WHen the fine dirt mixes with the moisture, a fine mud starts to build. If allowed to continue, the deminished air flow will result in poor performance and will require a professional cleaning that can take as much as 12 to 16 hours and involve extra charges for equipment involved in protecting the environment. In a worst case senerio, low air flow can cause the compressor to fail. Those 'Expensive" filters really are a bargain.

on Jul 19, 2010 | Heating & Cooling

1 Answer

I have a Mitsubishi split system with 2 indoor units (MS09TW) and one outdorr (MU09TW). The evaporator coil on one of the indoor units has been diagnosed by a A/C repair company as having a pinhole leak. I...

The following link includes service manuals for your air conditioning system:,TN__MU-09~17TW,TN_Service_Manual.pdfI'm sure you find the solution inside the manual.

Sep 29, 2012 | Mitsubishi MS09TW Air Conditioner

1 Answer

My amana window ac is blowing condesation out the vents. it is still this a problem

There is a condensation drain on the unit that is probably plugged. It is natural for air conditioning units to produce condensation as the evaporator coil (the coil/fins that make the air cold as a fan blows air across it ) is much colder than the outside air temperature ( usually between 38 and 55 degrees depending on the unit ). There is a basin or tray at the bottom of the unit that catches the condensation as it drips off the evaporator coil, and there is a drain that allows the water to drain form the unit. If this becomes plugged the water will build up and eventually drip out of the vents of the unit.
In the image, air is blown across the coil in the bottom left section of the picture ( this is the "cold' coil). Condensation can form on this.

Jul 29, 2011 | Amana Quiet Zone 12M12TA Air Conditioner


Ductless Split Air Conditioner Review

Ductless split air conditioning units are the very best thing for some situations. Of course they can be installed in the place of most any central air conditioning unit. They also are a very good alternative to window air conditioning units. I will explore the use of these units more closely and look at how they can be used effectively.
One of the many problems encountered by the professional is when they are asked to install central air conditioning in an older home that was never designed with air conditioning as even a possibility. The walls may be very thick stone. Often they have very little or no insulation. The floor structures may be rough cut lumber. The joists spacing may be random. Walls and ceilings are plaster and lathe. Basically everything is stacked against any type of ducted central air conditioning. Many log style homes also are not very easy to get any kind of ducted central air conditioning installed. The open ceilings and the bare log wall design does not allow for any kind of ducting. I'm sure there are other situations. These are the ones that I have come across most frequently.
If you have a home or building that falls into one of these categories you may want to investigate installing a ductless air conditioner. This type of air conditioner can be installed in almost any home or building. The small indoor unit can be attached to the wall with a few screws. Most of the units only require that a three inch hole be bored through the outside wall. In new installations the units can be placed on inside walls with some fore thought and planning. For installation in older homes or homes that are already built you will want to plan the units to be on the outside walls.
The outdoor condenser units can be placed up to one hundred feet away from the indoor units. One outdoor unit can be used for many indoor units. Up to four indoor units can be attached to the same outdoor condenser. Some very advanced electronics will control the operation of the condenser and compressor to supply the refrigerant to the indoor air handler units that are running at the time. With variable speed technology the compressor and the condenser fan will only run as fast as needed. This technology has become very efficient in the last few years. You do not have to give up any efficiency with these ductless split units.
Another advantage to these mini split air conditioners is that they can be controlled to run only in the rooms that you actually need air conditioning in. If you are not going to be in a room you can shut down the unit. The units also have timers that can be set to turn the air conditioning on or off at preset times. If you are not going to be home all day the air conditioning can be setback or turned off. The timer will turn on the air conditioning so that you return to a cool house. Central air conditioning is very hard to zone effectively. Also with large central air conditioning systems the outdoor compressor will be running at full capacity even though only a few rooms amy be calling for cooling. There are some central air conditioning systems that are do some staging and variable speed technology. These are not as efficient or as effective as the ductless split technology.
Ductless split heatpumps are another great idea to look at. For a few dollars more you can also very easily have heat from your air conditioning mini split. Then especially in the mild spring and fall weather you can have some very efficient heat with out starting up that big monster of a furnace or boiler in the basement. In southern climates the heatpump version of the ductless split system may provide enough heat year around.
Ductless split air conditioning is definitely something that can solve many problems for some homeowners. Add to that the many advantages of these units and you will find that they are worth every penny that you will invest into them. As with any project like this make sure that you screen your contractor. These units are not for do it yourself people. There are many things that need to be done correctly for these units to work properly and efficiently. A refrigeration license is also required to install these air conditioners.
By doing a little research and hiring the right person you will enjoy many years of trouble free service from your new ductless mini split system.

on Dec 04, 2009 | Heating & Cooling

1 Answer

My coleman mach 1 ps has serious corrosion or oxidation in the condenser coil. The corrosion or oxidation seems to also be cloging the condenser,the air flow through the unit is restricted. trying to clean...

are you by the water ( sea side ) if so units done.if anyone used coil cleaner on it they might have used wrong type or incorrectly mixed and coil is permently damaged. once coil becomes gray and flaky its no good. depending on age replace unit , if you are sea side highly recommend a unit thats designed for such application.

Jul 03, 2011 | Heating & Cooling

1 Answer

My split type airconditioning unit is not consistent with its cooling system..its automatically shutting down its coolness..what to do?

Hi, make sure you have a clean filter. Wash the outdoor units condenser coil, as they will get dirty and cause it to shut off on high head pressure. Turn off the power first. Careful not to use to much water pressure as you don't want to bend the fins. These are things you can do. Other than that, it takes a qualified tech to go any further. Check these things and keep me posted. The temperature between the return air at the filter and supply air temperature is between 18 to 25 degrees F. This is called your T.D.or temperature split. Keep me posted on what you find.

Jun 09, 2010 | Heating & Cooling

3 Answers


The leakage is probably from condensation and there should be some sort of drain for it. You should check to see if it is clogged or partially clogged. Also since you say it does it when it hasn't operated for a while you may want to check out where the lines pass through the wall and make sure that it is sealed up there so you don't get leakage from out side.

May 04, 2010 | Sanyo Split System Air Conditioner

1 Answer

Noisy much more than laast summer

It sounds like the condenser coils are dirty. This is the coils that are located on the outside. You can use compressed air or a sprayer on a water hose to rinse them. Window units need to be serviced just like split systems. Make sure you don't use a real high pressure so you don't bend the fins.

Mar 18, 2009 | GE Heating & Cooling

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