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HomeRepair HelpMiller Central A/C RepairMiller Central air conditioner - home's humidity is too high Repair
Miller Central air conditioner - home's humidity is too high
If your Miller central air conditioner is not removing humidity, start with the air filter. A clogged filter restricts airflow, reduces cooling capacity, and can cause the evaporator coil to frost over, preventing the system from dehumidifying your home. This is the most likely reason your house is humid with AC running or your home humidity is too high with AC on. Next, inspect the condenser coils for dirt and debris. Dirty coils cannot release heat effectively, so the compressor may run continuously while the air conditioner still fails to cool and dehumidify properly. If the filter and condenser coils are clean, the temperature control thermostat may be shutting the system off too soon. Test it for continuity before replacing it. A faulty thermistor can also send incorrect temperature information to the control board, while a defective control board may fail to operate the compressor or fan correctly. Check and replace accessible parts safely, but shut off power at the disconnect box and circuit breaker before service. Repairs involving 240V components or refrigerant and the sealed system require a licensed HVAC technician and EPA 608 certification. Enter your model number to find the exact Miller replacement part for your central air conditioner.
01 - Miller 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 - Miller 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 - Miller 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 - Miller 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 Miller central air conditioner not removing humidity?
Can a clogged filter cause my air conditioner to freeze up and make the house humid?
Why does my central air conditioner keep running but the house is still humid?
How do I test the thermostat or thermistor when my AC is not dehumidifying?
How do I find the correct Miller central air conditioner replacement part?
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