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HomeRepair HelpIntertherm Central A/C RepairIntertherm Central air conditioner - home's humidity is too high Repair
Intertherm Central air conditioner - home's humidity is too high
When your home has high humidity with the AC running, the system may be cooling without removing enough moisture. An Intertherm central air conditioner not dehumidifying is most often caused by a dirty or clogged air filter, which restricts airflow and can cause the evaporator coil to frost over. Replace the Intertherm air filter as needed, especially in dusty homes or homes with pets. Next, check the condenser coils for dirt and debris. Dirty condenser coils cannot release heat efficiently, so the compressor may run continuously while the air conditioner still struggles with humidity. A failing temperature control thermostat is another common cause because it may shut the system off before it runs long enough to dehumidify the air. Less commonly, the thermistor or control board may misread temperature or improperly control the compressor and fan motor. These checks can help when the AC is not removing humidity or you have a house humid with AC running. Enter your model number to find the exact replacement part for your Intertherm central air conditioner. Turn off power before servicing; testing or replacing parts near 240V wiring requires qualified help, and any sealed-system or refrigerant repair requires an EPA 608-certified HVAC technician.
01 - Intertherm 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 - Intertherm 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 - Intertherm 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 - Intertherm 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 Intertherm central air conditioner not removing humidity?
Can a clogged air filter cause high humidity and an evaporator coil to freeze?
How do I check dirty condenser coils when my home AC is not cooling or dehumidifying?
How can I test the Intertherm thermostat or thermistor if the AC is not holding temperature?
How do I find the correct Intertherm central air conditioner part number?
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