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HomeRepair HelpLG A/C RepairLG Air conditioner has poor temperature control Repair
LG Air conditioner has poor temperature control
If your LG air conditioner has poor temperature control, runs too briefly, runs too long, or cools unevenly, start with the parts that most often affect sensing and airflow. A faulty temperature control thermostat is the most likely cause of an air conditioner temperature control problem because it may shut the fan and compressor off too soon or fail to call for cooling when needed. Next, check the air filter. A clogged or dirty air filter restricts airflow, reduces cooling capacity, and can cause the evaporator coil to frost over, leading to AC not maintaining temperature or an air conditioner not removing humidity well. Clogged or restricted indoor or outdoor coils can create the same problem by making the unit run inefficiently. If airflow and coils check out, the LG air conditioner thermistor may be giving the control board bad temperature readings, which creates an air conditioner thermistor issue. Dirty condenser coils can also prevent proper heat transfer. Enter your model number on RepairClinic.com to find the exact LG replacement thermostat, air filter, thermistor, or coil-related part for your air conditioner.
01 - LG Air Conditioner Temperature Control Thermostat
The temperature control thermostat is a sensor which monitors the temperature of the air and activates a switch to provide power to the fan and compressor when the air temperature drops below a set point. If the thermostat isn’t working properly, the air conditioner may not stay running long enough to remove the moisture in the air and cool properly. To determine if the temperature control thermostat is defective, use a multimeter to test it for continuity. If the thermostat does not have continuity, or is shutting off too soon, replace it. (Note: Some thermostats may also control a heater and, as a result, will have three...
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Top Solution
02 - LG Air Conditioner Air Filter
If the air filter is clogged, air cannot flow properly through the air conditioner. This greatly reduces the cooling capacity of the air conditioner. In addition, if the air filter is clogged, the evaporator coils will frost over. Most air filters used in stand-alone air conditioners can be cleaned with soap and water. Only filters that are extremely clogged with debris or damaged will need to be replaced.
Highly Likely
03 - Dirty or Damaged Air Filter
If the air filter becomes clogged with dirt, it restricts air flow over the evaporator coils. If the air flow is reduced, the evaporator coils get too cold, which then causes the humidity in the room to condense on the coils and freeze. As frost accumulates on the coils, the frost restricts the air flow even more. Eventually, the entire evaporator coil assembly will frost over, causing the air flow to be completely restricted. Most air filters used in stand-alone air conditioners can be cleaned with soap and water. Only filters that are extremely clogged with debris or damaged will need to be replaced.
Common
04 - Clogged or Restricted Coils
Both the indoor and outdoor coils need to be clean for the air conditioner to work efficiently. A clogged or restricted coil will reduce air flow causing the unit to run inefficiently and longer.
Common
05 - LG Air Conditioner Thermistor
The thermistor is a sensor connected to the control board that detects the temperature of the air. The resistance value of the thermistor changes in conjunction with the air temperature. If the air temperature rises, the resistance value will decrease. To determine if the thermistor is at fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, or if the resistance of the thermistor does not change with a change in temperature, replace the thermistor. (To find specific temperature and resistance values, try checking your user’s manual.)
Less Common
06 - Condenser Coils are Dirty
The condenser coils dissipate the heat as the refrigerant passes through the coils. If the condenser coils are dirty, they won’t be able to dissipate the heat as effectively. As debris builds up on the coils, the air conditioner will become less efficient, causing the air conditioner to work harder to cool down. If the coils are significantly dirty, the air conditioner will not be able to remove the moisture from the air and maintain the proper temperature, resulting in the compressor running continuously in an attempt to cool the room. Check the condenser coils to determine if they are dirty. Refer to owner's manual for cleaning instructions.
Less Common
Frequently Asked Questions
Why is my LG air conditioner not maintaining temperature?
Why is my LG air conditioner not removing humidity?
Can a dirty air filter make my LG window air conditioner freeze up?
Why does my LG air conditioner keep running but not cool the room well?
How do I find the right LG air conditioner thermostat, thermistor, or air filter?
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