So, onto the problem. I live in a 3-story townhome that has two system (two AC units outside, one furnace on first floor/basement, the other in the attic). One system controls the 1st/second floor, and the other controls the top floor. The problem is with the system controlling the too floor, specifically the unit in the attic. On the top/3rd 1.Refrigerant leakage in split AC. Leakages are one of the most common split AC problems. The refrigerant (AC gas, as commonly known) is main contributor to the cooling of the air. If the split AC is not cooling properly, most probably the refrigerant level is low. Since the refrigerant is stored at very high pressure, all the curves and joints Step 1. Check the power. If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. Locate the circuit breaker and ensure it hasn’t tripped. If the power is fine, check to see if there is proper voltage. 1. Electrical Failure. An electrical failure can be caused by damaged contactors, wires, and fuses. Acids build up in your system as a result of electrical problems causing other parts of your AC to malfunction as well. Power surges can also result in electrical issues in your air conditioner. Page 1 SPLIT TYPE AIR CONDITIONER USER’S MANUAL ⚠CAUTION! WARNING: Do not use this device before reading these instructions. Model No. 048-MS-T1159K 048-MS-T11512K 048-MS-T11518K 048-MS-T239K 048-MS-T2312K 048-MS-T2318K 048-MS-T2324K NOTICE: If your package is missing parts or you are having issues with assembly, please call Belleze Furniture directly at (909)-595-5901. Split-Phase Air Conditioner Motor. This is the simplest design where the RUN winding and START winding are connected in parallel and 90° electrically apart. It is usually used in small pumps, fans, and blowers where the capacity is below 1 horsepower. It has a low starting torque but a high starting current. Some reasons your compressor is not working, but your fan is running include: a bad compressor capacitor, bad starter relay, low refrigerant levels, power issues, bad thermostat wiring, bad contactor, and a dead compressor. Shortly, we’ll be looking at these issues in a little bit in detail. Air conditioners are typically installed with two fans. Mold in Mitsubishi Mini-Split. I have a three-year old system, and the unit in the largest room is disgusting. The fan wheel inside is caked. I've called a few people locally to see how much it would cost to clean it out and the majority have never heard of a mini-split before. My regular go-to guy said to clean the fan blade (located deep Here are the top four: 1. Keep your coil clean. When your evaporator coil (indoor) is covered in dust and dirt, it can’t remove all of the heat and humidity that it’s designed to remove. Even if the coil isn’t so dirty that it prevents the AC from cooling your home, it can still be dirty enough to inhibit moisture removal. 2. Faulty Drain Pan. Another common cause of aircon leakage water is a faulty drain pan. The drain pan collects water that drips from the evaporator coils. If the pan is cracked or damaged, water can leak onto the floor. You’ll need to replace the drain pan with a new one to fix this problem. 3. 88dP.