Removal and Prevention of Ice Buildup. The first thing you’ll want to do when encountering ice buildup on your air conditioner is to simply shut off the unit and let the ice thaw for a few hours. You can use a heat gun or a hair dryer on its highest setting to speed the process along. Don’t attempt to remove the ice by hacking away at it A malfunctioning blower fan is the most common cause of the knocking noise that is coming from your aircon. If the sound is coming from inside your room, and if the wind being blown out of the air conditioner is weak, then this is probably the case. There may be something obstructing the evaporator fan. Check if there are any foreign objects Turn off the AC’s power: Working with water and electricity can be a dangerous combination. Shut off the air conditioner’s power at the breaker before you get started. Move the cap from the drain line: Look for a cap at the top of the line. Remove the cap so you can take a better look at the clog. 3. Loose Horizontal Louver. A very common reason an air conditioner light blinks is that the horizontal louver is not seated correctly or is loose. This can be easily fixed by simply pressing the louver back into place or tightening it with a screwdriver. If the louver is damaged, it will need to be replaced. 4. I have a 12BTU Mitsubishi mini split - MSZ-A12NA - I am trying to find out what size breaker to use in my GE panel. The specs say 208/230v, 1 phase, 60 hz - 15 AMP MAx fuse size - Problem is 208/230 i … read more The indoor unit is typically either a furnace or a fan coil with a blower fan and the evaporator coil. While there are a number of additional components involved, including electronic controls, sensors, and tubing, the main four parts of air conditioning systems are the two coils, the compressor and the expansion valve. Airflow through split-system air-conditioning evaporator coils. The outdoor air-cooled condensing unit consists of: A compressor, condenser coil, a condenser fan, and the necessary electrical control box assembly. Primary disadvantages of room air conditioners include: They block part of the window area and produce operating noise. Causes of Air Conditioning Unit Fan Not Spinning. There could be various reasons why your AC indoor fan isn’t operating. The first common cause is the power, the switch, or the breaker to the indoor unit or is off. Breakers are located on the air handler itself in some indoor units (Heat Pumps). Check the main breaker panel as well. This is commonly referred as hard starting. The compressor usually stutters and may not come on efficiently. If the problem is continuous, take a look at the fuse and the wiring. Replace the fuse if necessary and make repairs on the wires. 5. Problems with Motor. The air conditioner compressor may fail in case of an overload or if it overheats. In this HVAC Training Video, I Show 10 Common Blower Fan Motor Problems and I Explain Why The Blower Motor is Not Running, Not Working during Fan Mode, Air C NZoCL.