The modern Samsung air conditioners have a very developed self-diagnostics system, and when the control system detects an error, it blocks the operation of the entire device and displays a cause of faulty condition.
The control system of the SAMSUNG air conditioners reports that an error occurred by blinking of a light-emitting diode on the surface of the internal (or external) unit. When a particular error of an air conditioner is detected, light-emitting diodes blink in a certain order, which corresponds with a particular error. If the control system of an air conditioner detects more than one error, the error with the highest priority is displayed first and then all the following errors are displayed.
Samsung e109 error
The E109 error occurs when there is poor communication between the indoor PCB and the outdoor unit. Check the F1 and F2 cables in both units: there can be a disconnection at some point. Be sure that all plugs are in place. If they are, there may be a problem with the wiring (damage). If you cannot see any signs of damage, address a qualified technician. Not unlikely, the PCB is faulty. If it is, you will need to replace it.
Samsung e153 error
Secondary detection of the condensate overflow switch
- Check the float sensor in the indoor unit
- Check the PCB connector in the indoor unit
From time to time, dirt and debris build up in the drain system and prevents condensed water from getting out of it. This can cause a lot of trouble, because an AC can produce up to 20 gallons of water each day. Therefore, it is absolutely imperative that you check thee drain system on a regular basis and clean it if necessary.
The condensate overflow switch (the HVAC wet switch) is designed to prevent an overflow. It is activated once water in the pan reaches a critical level, and the switch mechanism trips. When that happens, the AC unit will receive a signal from the switch, so the system will stop the condensation process. It takes a bit of skill to locate a blockage. Therefore, it is advisable to address a qualified technician. However, if you have some experience with such units, you can do something about it.
Locate the condensate overflow switch. The location depends on your unit’s orientation. If you have a horizontal unit, the pan is located beneath the system, and the float switch is attached to it.
If your horizontal unit does not have a secondary drip pan or you have a vertical unit, you can fix the switch on the PVC drain pipe. Once the water stops running properly, the switch will be activated.
Some ACs feature a condensate pump, which actually drains the condensed water from the system before gravity does it. In turn, these pumps feature a mechanism, which is quite similar to a float switch and stops the condensation process to prevent damage.
Samsung e4 error
Faulty thermostat or lack of refrigerant
How thermostat sensors work
There are evaporator coils inside an AC, and the thermostat sensor is located near them. As the impeller drives air through the return vents, it flows near the coils and the sensor. The sensor measures the air temperature and checks the reading against the thermostat setting. If the air temperature exceeds the temperature specified by the setting, the sensor will trigger the compressor and thus launch the cooling process. And vice versa, if the air that passes by the sensor gets cooler than specified in the settings, it will signal the compressor to stop.
Signs of a thermostat problem
If there is a thermostat issue, it will start to switch on and off irregularly. Particularly, it may stop cooling your home before the temperature in your room reaches an optimal level. In other words, it won’t be able to maintain proper temperature in your home. Once you notice these random cycles, it is time to check the thermostat.
Your AC has run low on refrigerant
All ACs feature a closed refrigerator pipe system. As the agent circulates it, it regulates the temperature of the air coming into your home.
The pressure in the system depends on the temperature. However, no matter how it changes, the refrigerant should stay in the system.
If the system suddenly runs low on the coolant, there has to be a leak. It should be noted that even a tiny leak is a danger, because the pressure will make things worse anyway.
Usually, leaks occur due to physical damage or erosion of the refrigerator line. You should be careful (also when installing the system) and take steps to prevent any physical impact on your AC.
Please, check the line for erosion. If you notice any weak spots, address your local technical service provider. Refrigerant replacing can be a little expensive, especially if you have an old unit, which uses a less available type of coolant.