Troubleshooting Common Air Conditioner Problems

Posted on June 27th, 2025 by Ferocious Digital

When the temperature rises, your air conditioner becomes your best friend. But what happens when it doesn’t work as it should? Before you sweat it out, know that many AC issues can be tackled with some troubleshooting. Below, our team at Devine Bros has some of the most common air conditioner problems and how you can address them.

1. Insufficient Cooling

Several culprits might be to blame if your AC is running but your home feels hotter than cool.

Potential Causes:

• Dirty Filters: A clogged filter restricts airflow, making your AC less effective.
• Blocked Vents: Furniture or objects covering vents can block cool air from circulating.
• Low Refrigerant Levels: If refrigerant levels are too low, the unit struggles to cool your space.

Troubleshooting Tips:

• If the air filter is dirty, check and replace it. A good rule of thumb is to inspect it once a month.
• Ensure all vents are clear and unobstructed. Rearrange furniture if necessary.
• If you suspect low refrigerant, call a professional like Devine Bros to inspect and refill it safely.

2. Strange Noises

Air conditioners aren’t silent, but unusual sounds like banging, buzzing, or squealing often indicate a problem.

Potential Causes:

• Loose Parts: A rattling noise could suggest screws or components have come loose inside the unit.
• Fan Issues: A squealing sound may point to a worn fan belt.
• Electrical Problems: Buzzing could mean there’s an issue with the motor or electrical connections.

Troubleshooting Tips:

• Turn off the unit and inspect it for loose or obstructed parts. Tighten any visible screws carefully.
• For internal components like fan belts or motor issues, contact an HVAC specialist. These are best left to professionals.

3. Water Leaks

Are you noticing puddles or leaks around your AC? You’re not alone. Water leaks are a common issue, especially during humid weather.

Potential Causes:

• Clogged Drain Line: Condensation can’t escape if the drain line becomes blocked.
• Dirty Coils: A grimy evaporator coil can cause water to drip.
• Improper Installation: A poorly installed air conditioner may not drain properly.

Troubleshooting Tips:

• Clear the drain line by flushing it with a mix of water and vinegar or using a wet/dry vacuum to remove the clog.
• If the evaporator coil appears dusty, clean it; however, this may require removing the cover, so proceed carefully.
• If the issue persists, have a professional evaluate the installation or inspect for other hidden problems.

4. AC Not Turning On

You press the power button… and nothing happens.

Potential Causes:

• Tripped Circuit Breaker: A power surge might have overloaded the circuit.
• Faulty Thermostat: A broken thermostat could prevent your AC from turning on.
• Wiring Issues: Damaged or loose wires could disrupt the unit’s connection to power.

Troubleshooting Tips:

• Check your circuit breaker and reset it if necessary.
• Replace thermostat batteries or recalibrate it according to the manufacturer’s instructions.
• For wiring problems, contacting an expert immediately is best to avoid safety risks.

HVAC Services in Norwalk, CT

Helping Norwalk homeowners improve their lives at home is something Devine Brothers has been providing to their customers for over 100 years! If you want to learn more about our service or need supplies, contact us today! For more tips & tricks, make sure to like us on Facebook!