I installed a trio of Sanyo mini splits last spring and two work just great. One I had to have recharched after about a month of use. Oil appeared to be leaking from the connection to the outside unit. After recharge it worked just great, for about a month. Once again it looked as though the unit was leaking at the fittings. I had a portable unit, plugged it in and let the wall unit sit until this week. I was interested to find the unit still held pressure when I undid the fittings to remove it from the wall. Yet it leaks oil when running and cooling.
I agree with bobotfel, adding that the oil is an indicator, not the problem itself.
Oil circulates along with refrigerant, as a mist. Thus is oil is present, a leak is indicated.
The fact that you unit held pressure for several weeks is not surprising. There would be, at a guess, 50-100 pounds of pressure in the tubing when the unit is not running, which could take quite some time to lead down. This is a break for you, as the pressure in the lines would prevent air and--worse--moisture from entering.
If your lines or fittings are not damaged, then bobotfel's 2-wrench solution is probably the end of your problem.
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Re: Appears to leak up in the wall unit
RE TIGHTEN THE FITTINGS WITH LEAK USING TO WRENCHES AND MONITOR THE LEAK. IF THE LEAK CONTINUES YOU NEED TO LET THE GAS OUT OF THE SYSTEM TO CHECK THE PIPE FLARE IF STILL OK. IF NOT YOU NEED TO RE FLARE THE PIPE AND CONNECT IT BACK AND TIGHTEN, LEAK TEST AND RECHARGE WITH REFRIGERANT.
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If this is a mini split ductless there is a control wire with 3-4 wires inside (normally red, white, blue and green) that is connected from the outdoor unit to the indoor unit. This wire feeds voltage from the o.d. unit to the I.d. unit. If all connections at the o.d. unit are good, then check for voltage at these connections at the o.d. unit. If no power at these connections then a circuit board has faulted. Call a tech. and have a tech support number ready (1-800#) in case your service tech don't have it.
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.
The condensate drain line was not properly installed. Make them pull the wall unit and correct the problem.
Be persistant until you are satisfied they have the problem corrected. Do not pay any additional money. If they do not correct the problem then report them online to the state board of heating and air. Fill out their requested complaint form and follow thru with a second complaint if you do not get total satisfaction from the contractor that installed the unit.
Hope this helps.
Take the cover off the inside unit and look for the drip pan under the evaporator coil. It should have either one drain in the middle of the pan or a series of smaller drains along the back of the pan. The drain(s) is probably clogged up and causing the pan to overflow into your home. Also check the drain line on the outside wall where the refrigerant lines come through the wall for a blockage.
This can only be a gas problem.
the split units goes on on and off if a shortage of gas is involved, the chances that you would here it wont be that big for the fans would make too much noise.
get a repair man for a re gas and all is well.