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HomeRepair HelpHeil Central A/C RepairHeil Central air conditioner is frequently cycling/short cycling Repair
Heil Central air conditioner is frequently cycling/short cycling
If your Heil central air conditioner is frequently cycling or short cycling, the most likely cause is a clogged air filter restricting airflow through the furnace or air handler. Replace the filter as needed, especially in dusty homes or homes with pets. Next, check the outdoor condenser coils. Dirty coils cannot release heat efficiently, which can make the compressor overheat and shut down repeatedly. If the filter and coils are clean, the Heil wall thermostat or thermostat wiring may have failing electrical contacts that turn the condensing unit and air handler on intermittently. A defective control board is another possible cause because it may send power to the cooling components inconsistently. This condition is also called AC short cycling, air conditioner short cycling, or HVAC short cycling. Filter replacement and visual coil inspection are reasonable DIY repairs, but testing a thermostat, control board, or other wiring involves electrical hazards. Disconnect power before servicing, and have a qualified technician handle 240V line-voltage work or any sealed-system diagnosis involving refrigerant. Enter your model number to find the exact replacement air filter, thermostat, control board, or other Heil central air conditioner part for your system.
01 - Heil Central Air Conditioner Air Filter
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. A clogged air filter will greatly reduce the air flow of the furnace or air handler which can result in the unit short cycling when trying to cool the home.
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Highly Likely
02 - 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 heat pump will become less efficient, causing the unit to work harder to cool down. If the coils are significantly dirty, the heat pump will not be able to remove the heat from the outdoor coil, resulting in the compressor overheating and short cycling. Check the condenser coils to determine if they are dirty. Refer to owner's manual for cleaning instructions.
Common
03 - Heil Central Air Conditioner Wall Thermostat
The wall thermostat has electrical contacts that control the power supply to the furnace, air handler and condensing unit. If the contacts in the thermostat fail, the cooling system may turn on intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the wall thermostat does not show proper continuity, replace it.
Less Common
04 - Heil Central Air Conditioner Wifi Thermostat
The WiFi thermostat has electrical contacts that control the power supply to the furnace, air handler and condensing unit. If the contacts in the thermostat fail, the cooling system may run intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the WiFi thermostat does not show proper continuity, replace it.
Less Common
05 - 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.
Less Common
06 - Heil Central Air Conditioner Control Board
The control board regulates the power supply to all of the components of the furnace or air handler. If the control board fails, it might not send voltage to parts of the cooling system, causing a loss of cooling and frequent cycling.
Less Common
Frequently Asked Questions
Why is my Heil central air conditioner short cycling?
Can a dirty air filter cause my central air conditioner to turn on and off repeatedly?
How do I troubleshoot a central air conditioner that keeps cycling because of the thermostat?
Could dirty condenser coils or a weak capacitor make my AC short cycle?
How do I find the correct Heil central air conditioner replacement part?
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