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HomeRepair HelpSharp A/C RepairSharp Air conditioner has poor temperature control Repair
Sharp Air conditioner has poor temperature control
If your Sharp air conditioner has a temperature control problem, runs too briefly, runs too long, or the AC is not maintaining temperature, start with the parts that most often affect sensing and airflow. The most likely cause is a faulty temperature control thermostat, which monitors room air temperature and signals the fan and compressor to run. If it shuts off too soon or has no continuity, the unit may not cool or dehumidify properly. Next, check the air filter. A clogged or damaged air filter restricts airflow across the evaporator coil, which can cause frost buildup, weak cooling, and poor temperature control. Dirty or restricted indoor and outdoor coils can also make the air conditioner run inefficiently and longer than normal. Less commonly, a failed thermistor can give the control board the wrong temperature reading, creating a Sharp air conditioner thermistor issue. Dirty condenser coils can also prevent heat from leaving the system, leaving the air conditioner not removing humidity or holding the set temperature. Enter your model number on RepairClinic.com to find the exact Sharp replacement part for your specific air conditioner.
01 - Sharp 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 - Sharp 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 - Sharp 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
07 - Sharp Air Conditioner Control Board
The control board regulates the voltage to the compressor and the fan motor. If the control board fails, some components will not function properly or will not work at all. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the control board.
Less Common
Frequently Asked Questions
Why is my Sharp air conditioner not maintaining temperature?
Why is my Sharp AC not cooling or removing humidity?
How do I test a Sharp air conditioner thermostat or thermistor?
Why does my Sharp air conditioner keep running but not cool the room?
How do I find the right Sharp air conditioner air filter, thermostat, or thermistor?