So, here are the basics. First, the air filter should be cleaned regularly. They are usually easily accessible in the front cover.  Just remove them, wash them and re-install them. This should be done at least every three months. The next thing is to clean the outdoor unit. Shut the power to the unit off. Then, with a garden hose, you can gently wash out the coil. Hold the nozzle at about a 45 degree angle to the coil. This should help to keep from smashing the fins on the coil. If you smash some of the fins they can be easily straightened with a small screwdriver.

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Then, you should check the electrical connections inside the condensing unit. Ensure that all the terminal connections are tight and look for signs of a wire getting hot. If you see discolored wires or partially melted wires, you can repair them and then ensure the connections are tight.

Also, look at the contact surfaces on the compressor contactor. If you see signs of pitting or burning on them you should replace the contactor.

Examine the run capacitor(s) for signs of deforming or leaking. If they are bulging or leaking they should be replaced.

Ductless AC Maintenance, Refrigerant Leaks?

Next, you should look for evidence of refrigerant leaks. Look at all the flare connections. If there is a leak, the connections will usually be oily and dirty. It is usually a simple matter of tightening the connections. Be careful not to over torque them or bend the lines.

Then use a soapy water solution to check for leaks. Put the solution on the location and see if small air bubbles form. If no bubbles form, the system can be recharged.

You should also check the drain hose to make sure it is not clogged.

You can complete your ductless ac maintenance by restoring power to the unit and observing a cooling or heating cycle.

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