Air ConditioningExpanded Guide on Troubleshooting Your Air Conditioning System

September 11, 2023by Dev

A swift diagnosis and action can make all the difference when your air conditioning isn’t working properly. While some issues can be addressed without professional help, there are times when you’ll need the expertise of an HVAC specialist. Here’s an in-depth guide from Andersen Heating & Cooling to assist you.

Your Air Conditioner Won’t Turn On

  • Check the thermostat: Ensure it’s on “cool” and set to a temperature below room level.
  • Inspect the circuit breakers: A tripped breaker can be reset, but if it trips repeatedly, you may be facing an electrical issue.
    • Solution: A one-time reset might solve the problem. However, if it keeps tripping, reach out to Andersen Heating & Cooling.
  • Examine the external switch: Many units come with an external on/off switch.
    • Solution: Ensure it’s in the ON position. If still unresponsive, it’s time to consult an expert.

The AC is On, But the Air Isn’t Cold

  • Thermostat settings: Verify the desired temperature is set.
  • Clean or replace the air filter: Accumulated dirt can diminish cooling effectiveness.
    • Solution: Monthly checks and cleaning or replacements during high-use periods can help.
  • Check the evaporator coil: Ice buildup affects cooling performance.
    • Solution: Switch off the AC and let it thaw. If the issue repeats, schedule a service with Andersen Heating & Cooling.

Poor Air Flow

  • Air filter: A congested filter affects airflow.
    • Solution: Regular cleaning or replacement can make a difference.
  • Examine air vents: Ensure clear passage.
    • Solution: Adjust your furniture and clear any obstructions.
  • Inspect the ductwork: Leaks or obstructions can diminish airflow.
    • Solution: Minor leaks can be sealed with duct tape. For extensive issues, consider a professional service.

The AC Cycles On and Off Too Often

  • Dirty evaporator or condenser coils: Affects overall efficiency.
    • Solution: Use a coil cleaner or, for a thorough cleaning, get assistance from Andersen Heating & Cooling.
  • Thermostat location: A wrongly placed thermostat can yield inaccurate readings.
    • Solution: Consider moving it away from heat sources or areas with direct sunlight. Our experts can guide you on optimal placement.

Water Leaks Around the AC Unit

  • Check the condensate drain: It can get blocked by mold or algae.
    • Solution: Clean with a brush or vacuum. Persistent issues? It’s time for professional intervention.
  • Inspect the overflow pan: Leaks can originate from damages here.
    • Solution: Small damages can be patched, but significant wear calls for a replacement.

Unusual Noises from the AC Unit

  • Rattling or buzzing: Often due to loose parts.
    • Solution: Switch off the unit, tighten any loose components. If the issue persists, consult Andersen Heating & Cooling.
  • Whistling or hissing: Could be a refrigerant leak.
    • Solution: This is a task for professionals. Handling refrigerants without expertise can be risky.
  • Grinding sounds: Indicates possible motor issues.
    • Solution: Switch off immediately and get in touch with an HVAC technician.

Bad Odors When the AC is On

  • Musty smell: A sign of mold or mildew.
    • Solution: Cleaning the evaporator coil and ducts might help. If odors persist, you may need an in-depth assessment.
  • Burning smell: Likely an electrical issue.
    • Solution: Prioritize safety! Turn off the AC and contact Andersen Heating & Cooling immediately.


Tackling minor AC challenges can be empowering, but always know when to call in the pros. Andersen Heating & Cooling is here to assist with any complexities you may face. Consistent maintenance and expert servicing ensure your unit operates at peak performance, keeping your space cool and comfortable.

Andersen Heating & Cooling

HVAC Repair, Maintenance, & Installation Service around Charlotte, NC.
No Extra Charge For Weekend Appointments!

Sunday: 7:30am - 12am
Monday: 7:30am - 12am
Tuesday: 7:30am - 12am
Wednesday: 7:30am - 12am
Thursday: 7:30am - 12am
Friday: 7:30am - 12am
Saturday: 7:30am - 12am
9800 Twin Lakes Parkway
Suite C
Charlotte, NC 28269
(704) 596-2525


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