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HomeRepair HelpColeman Central A/C RepairColeman Central air conditioner - home's humidity is too high Repair
Coleman Central air conditioner - home's humidity is too high
When your Coleman central air conditioner leaves the house humid, the system may be running without removing enough moisture. The most likely cause is a dirty or clogged air filter. Restricted airflow can make the evaporator coil frost over, preventing the air conditioner from dehumidifying properly. Replace the filter, especially if you have pets or a dusty home. Next, check for dirty condenser coils. Debris prevents the coils from releasing heat, so the compressor works harder and the system may fail to remove humidity. If you have a house humid with AC running or your air conditioner is not dehumidifying, test the temperature control thermostat. A thermostat that shuts the system off too soon can cause home humidity too high with AC on. A faulty thermistor or control board is less common and should be checked after these likely causes. You can enter your Coleman model number to find the exact replacement air filter, thermostat, thermistor, or control board for your central air conditioner. Cleaning filters and accessible coils is generally DIY-safe, but 240V components require caution, and any refrigerant or sealed-system repair requires an EPA 608-certified HVAC technician.
01 - Coleman Central 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. Check and replace the air filter at least twice a year, more often in dusty/dirty environments or if there is a pet in the home.
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Highly Likely
02 - Clogged Air Filter
If the air filter is clogged, air cannot flow properly through the home's venting system. This greatly reduces the cooling capacity of the air conditioner. In addition, if the air filter is clogged, the evaporator coils will frost over and not be able to remove moisture from the air. The air filter should be checked and replaced at least twice a year, more often in dusty/dirty environments. Refer to owner's manual for guidance.
Highly Likely
03 - 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.
Highly Likely
04 - Coleman Central 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...
Common
05 - Coleman Central 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 - Coleman Central Air Conditioner Control Board
The main 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 Coleman central air conditioner not removing humidity?
Can a thermostat cause high humidity with the AC running?
How do I test a Coleman central air conditioner thermistor?
How do I know whether the Coleman AC control board is causing poor humidity control?
How can I identify and buy the correct Coleman central air conditioner part?
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