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HomeRepair HelpHeil Central A/C RepairHeil Central air conditioner - home's humidity is too high Repair
Heil Central air conditioner - home's humidity is too high
When a Heil central air conditioner is not removing humidity, start with the air filter, the most likely cause. A clogged Heil air conditioner air filter restricts airflow, can frost the evaporator coil, and keeps the system from dehumidifying properly. Replace the filter as directed, especially if you have pets or a dusty home. A dirty condenser coil is another highly likely cause of a house humid with AC running. When the condenser coil cannot release heat, the compressor may run continuously while the air conditioner still fails to lower humidity. Next, check the temperature control thermostat. A defective thermostat may shut the system off too soon, reducing cooling and moisture removal. If the thermostat checks good, the thermistor may be sending incorrect temperature information to the control board. A failed control board is less common and should be checked only after these parts. Enter your model number to find the exact replacement air filter, thermostat, thermistor, or control board for your Heil central air conditioner. Filter replacement and exterior coil cleaning are reasonable DIY tasks. Turn off power before electrical testing, and have a qualified technician handle 240V wiring or any refrigerant or sealed-system repair requiring EPA 608 certification.
01 - Heil 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 - Heil 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 - Heil 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 - Heil 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 home humidity too high with the AC running?
Can a clogged air filter cause my air conditioner not to dehumidify?
How do I test the Heil AC thermostat or thermistor when the house is humid?
Could a dirty condenser coil or bad control board cause high humidity?
How do I find the correct Heil central air conditioner replacement part?
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