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Common Issues That Cause Failure During Heatwaves
Air conditioners usually give signs before they stop working altogether. Cooling may weaken, or the system may run without lowering the temperature.
In some cases, the unit doesn’t respond when settings are changed. If comfort in your home is starting to slip, a few common issues are worth checking first.
At Black Hills Inc., we see these issues regularly, especially when systems shift into heavier use. Some problems are simple. Others point to issues that need professional attention.
So, Why Do So Many ACs Stop Working During the Initial Heatwaves?
Thermostat Issues
The thermostat is the starting point for most cooling problems. Incorrect settings, dead batteries, or a faulty thermostat can make it seem like the AC isn’t working when the system is never receiving the signal to turn on.
Double-check that the thermostat is set to cooling mode and the temperature is set lower than the current room temperature. If the display is blank or unresponsive, batteries or wiring may be the issue.
Clogged or Dirty Air Filter
A dirty air filter restricts airflow, which can cause cooling problems. When airflow drops, the system struggles to remove heat, and the AC may stop blowing cold air altogether.
If the AC unit not blowing cold air has been an issue for a while, checking the filter is a good first step. Filters that haven’t been changed regularly can also contribute to frozen coils or system shutdowns.
Low Refrigerant or Leaks
Refrigerant plays a direct role in cooling. When levels are low, the system can’t remove heat properly, which often results in warm air coming from the vents.
Refrigerant issues don’t fix themselves. If your AC is running but not cooling, or the ac not blowing cold air keeps getting worse, the system likely needs to be inspected for leaks or low charge.
Power and Electrical Problems
Sometimes the issue isn’t the AC unit itself but the power supplying it. Tripped breakers, blown fuses, or local outages can prevent the system from turning on.
If the AC not working includes no response at all, checking the breaker panel is a good place to start. Repeated trips usually point to a deeper electrical issue that should be checked by a professional.
Drain Line Clogs
Air conditioners produce condensation, which drains away through a dedicated line. If that line becomes clogged, water can back up and trigger safety shutoffs.
When this happens, the system may stop running even though nothing else appears wrong. Drain issues are a common reason an AC unit not blowing cold air suddenly shuts down during the cooling season.
Condenser Coil Problems
The outdoor condenser coil releases heat from your home. When that coil becomes dirty or covered in debris, heat can’t escape properly.
In some cases, restricted airflow can cause coils to freeze. Frozen or dirty coils can make it seem like the AC isn’t working, even though the system is technically running.
Failed or Worn Components
Air conditioners rely on several moving and electrical parts to operate. Capacitors, motors, fans, and internal controls all wear down over time.
When one of these components fails, cooling performance is the first thing noticed. This can show up as an AC not blowing cold air, unusual noises, or the system cycling on and off unexpectedly.
When to Call for AC Service
If you’ve checked the basics and your AC not working issue continues, it’s time to have the system looked at. Repeated problems, warm air, or systems that won’t turn on often indicate issues that require professional repair.
Contact Us for Service
If your AC isn’t keeping up or has stopped working altogether, Black Hills Inc. can help identify the issue and recommend the next step. Our team handles AC repair for systems that aren’t cooling properly, won’t turn on, or keep shutting down.
Contact us for service when your air conditioner needs attention.