With this ductless ac troubleshooting guide, you can find problems with your system, fix it yourself, and save a lot of money.We will guide you through the process of identifying the problem and repairing your air conditioner or heat pump.The normal service charge would cost you over $100 but, with this guide, you can save that money. **NOTE** Only you can assess your ability to perform these actions. This is a guide and cannot give the details/procedures for every possible situation. If your unit is not operating, you should begin your ductless ac troubleshooting by checking the display on the fan coil for a fault code. In most units, the display will show an E with a number. With that number you can narrow down the problem by referring to the user manual/installation instructions.Next, you should check the room temperature setting. On most units this is done with the remote control. Ensure that the unit is in the proper mode and the setpoint is correct. You should also make sure the unit has been off for at least three minutes.

If the display on the air handler is blank, check the fuse or breaker for the unit. In the case of a tripped breaker, you should check the wiring connections in the outside unit. Some units also have a fuse on the control board in the air handler. Continue your ductless ac troubleshooting by checking the air filter. It should be washed at least every month. Also check to see if there is any ice buildup on the coil. If there is ice build up, check to make sure the fan is working. Make sure the blower wheel is free to move. If it is free and the fan is not working then the problem is probably the motor or the control board. If the fan is working, allow the ice to melt and check the refrigerant level in the unit. If there is no ice and the fan is working, you should go to the outdoor unit. If the fan on the outside unit is not running, you should check the dual run capacitor. Our capacitor testing guide will help you with that. If the capacitor can is bulging, it is a good indication that it is bad.

If the capacitor is good the condenser fan motor may be bad. You can use our fan replacement guide to help you.If the fan is running, feel the compressor to see if it is running. how many years does an air conditioning unit lastIf it is hot to the touch and not running, shut off the power and cool the compressor by pouring water over it. size up ac unitThen, check the outdoor coil and make sure it is clean. ac unit turns on but no airYou should also check the dual run capacitor.After the unit is running, you should check the refrigerant level.If, after the compressor is cooled down, the unit makes a loud humming noise when it is trying to start, the compressor rotor may be stuck. You can use a hard start capacitor to try to get it to run.

If the compressor still does not start, it may need to be replaced. You can use our compressor testing guide to check to be sure.If the fan and compressor are running but the cooling or heating is insufficient, start by cleaning the unit. Ensure the fan coil, filter, and condenser coil are clean. Then you can check the refrigerant level and adjust per the operating instructions.**NOTE** IN SOME COUNTRIES, YOU MUST BE CERTIFIED BY THE GOVERNMENT TO HANDLE REFRIGERANT. If the unit's refrigerant charge is adequate, the unit may be improperly sized. The only way to tell if the unit is the proper size is through a process called a load calculation. If your unit is dripping water, you should begin your ductless ac troubleshooting by checking the drain hose to see if it is clogged. The easiest way to do this is with a bottle of water. Outside, stick the end of the hose in a bottle of water. Seal around the bottle opening with your hand. Then squeeze the water bottle and then pull the hose out.

The water should drain but this may need to be done a few times to make sure the line is clean.If the hose was not clogged, check to make sure the fan coil unit is sloped properly. The unit should be slightly out of level with the end attached to the drain hose slightly lower than the other end. If the remote does not work, you can replace the batteries. If it still does not work or you can't find it, most units have an emergency button on the fan coil unit that you can push to make it run. It will then operate as necessary to maintain a default temperature. You should complete your ductless ac troubleshooting by observing a complete heating or cooling cycle. Now, you can get live support or leave a message for the HVACrepairguy through Facebook Messenger.PRODUCTS & SERVICES TOP Air Conditioning & Refrigeration Daikin leverages its experience and technology to deliver air conditioning solutions that meet the demands of any setting. Air to Water Heat Pump Systems

Training & Technical Support Pioneering Fluorine Technology Providing Solutions for Life Utilizing IPM motor and inverter technology for greater energy savingsHere are some basic split airconditioner control troubleshooting guide that may help you to understand more of the electronics control of your equipment. This is a non-inverter type of control.Take note that you need to have a good electrical knowledge to do this as the power supply to the printed circuit board is LIVE. It is always a good practice to disconnect and isolate the power supply when you are troubleshooting the control board. If you are not sure, get a qualified technician to check your unit. A split air conditioner is also commonly known as ductless split or mini split where there is an outdoor unit and an indoor unit. The outdoor unit consists of a compressor, a fan and the condenser. This is the place where heat from the indoor is transferred from the indoor to the outdoor and is rejected to the surrounding. 

The indoor unit basically consists of an evaporator, an expansion valve and a fan. Copper pipes are used to connect the flow of refrigerant between the indoor unit and the outdoor unit. The power input can come from the indoor unit to the outdoor unit. The non-inverter split air conditioner basically consists of a ON/OFF compressor where the compressor is either ON fully or OFF fully. The inverter based compressor can regulate the speed of the compressor depending on the load required.Here is the breakdown of the typical controller for better understanding.Main Control Printed Circuit BoardThe main control board can be divided into input power supply, a microcomputer controller integrated circuit, temperature sensor inputs and outputs to control the compressor, indoor fan speed, outdoor fan speed and air swing. The AC input from the mains has to be converted to DC voltage where it can be used to power the integrated circuits and drivers in the electronics circuit. There are two ways to do this.

One is by using a step down transformer where the AC voltage is stepped down to voltage such as 25V AC or 12V AC. This voltage is then converted to DC by the use of diode bridge as rectifier and electrolytic capacitor to smoothen the rectified voltage. A 3-pin voltage regulator is used to get a fixed 5V DC or 12V DC power supply. This low voltages are used to power the microcomputer, DC relays and other integrated circuits in the circuit. A simple linear power supply circuit. The other method is to use switched mode power supply or SMPS which makes the dimension of the printed circuit board smaller as the bulky transformer can now be replaced with a smaller transformer. This design is becoming more common as the quest for smaller space is becoming more critical.There is usually a surge absorber or a varistor connected across the input of the power supply. This device acts to protect the internal circuit in the event of lightning or power surge. When the power input to the device exceeded its voltage rating, it will clamp the voltage by bypassing it to the input source.

This is one device that can be easily damaged if the power surge or lightning occurred beyond its maximum rating.A fuse is placed in series with the input power supply to cutoff any overcurrent or short circuit that happened in the circuit. This is another protective device used in most electronics circuit. It has to be replaced once it is blown.In order for the handheld remote control to send the settings to the controller at the air conditioner unit, there is at least an infra-red receiver printed circuit board that receives the signals from the handset. This receiver is usually located in front of the indoor unit and can be identified by a specially made sticker that allow infra-red frequency to pass through.Also known as handset, this is where you can control the air conditioner settings remotely by pointing your handset towards the air conditioning unit. Temperature, timer, operating mode, energy saving function, air swing direction, fan speed, ionizer and sleep mode are some of the functions that are usually available depending on the manufacturer of the unit.