• 19 JUN 19
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    Air Conditioning Troubleshooting Guide

    Air Conditioning Troubleshooting Guide

    If you are searching for air conditioning troubleshooting, this post should help!  Troubleshooting air conditioning systems can sometimes be challenging.  There are a lot of parts working together to cool your home, keep reading for some tips.

    To help you save some cash and get back your comfort, try the following do it yourself A/C troubleshooting tips the next time your A/C unit starts acting up:

    Make Sure Your A/C’s Air Filter Isn’t Dirty

    A/C issues caused by a dirty filter:

    • Higher-than-normal energy bills
    • Frozen evaporator coil
    • Low airflow from air vents
    • Ice forming on the refrigerant lines
    • Water leaking from your A/C unit
    • Insufficient cooling (hot/cold spots, A/C struggles to reach the set temperature)

    What to do: Check your air filter. Replace your filter if it’s dirty or clogged.

    A/C Equipment Failure

    When you have a dirty air filter it can “suffocate” your A/C unit. Do you see a layer of dirt on the filter? That dirt will limit the amount of air your A/C unit can breathe in.

    When your A/C isn’t getting enough airflow into the system, it can cause a whole plethora of A/C problems and can eventually lead to complete A/C system failure.

    Check your thermostat settings

    A/C problems caused by wrong thermostat settings:

    • A/C Won’t Turn On
    • Warm or hot air coming from your air vents

    We have made a ton of service calls to repair an A/C that “is not working” just to find out that they had just overlooked moving the thermostat from HEAT to COOL. It happens more than you think, especially when switching from heating season to cooling season.

    What to do: Check your thermostat and make sure it’s set to COOL and not HEAT.

    Check Your A/C Circuit Breakers

    A/C issues caused by tripped circuit breaker: A/C won’t turn on

    If your A/C circuit breakers are tripped, switch the breakers into the ON position and try running your A/C again.

    If the breaker instantly trips once the A/C comes on, don’t switch the circuit breaker again. You’ll have to have a professional take look at the unit as this could be a sign of a bigger electrical problem.

    What to do: Find your home’s main electrical panel and look for circuit breakers that aren’t in the ON position. If your circuit breakers are labeled, there should be one that says “air conditioner” or “A/C”.

    Check Your Outdoor A/C Unit

    A/C problems caused by an unclean outdoor unit:

    • Higher-than-normal energy bills
    • A/C doesn’t provide sufficient cooling
    • Warm air coming from air vents
    • Frequent A/C Repairs

    What to do: Go outside and look at your outside A/C unit (condenser). If there is a layer of dirt on the outside of the unit, use a garden hose on a low setting to hose off the dirt. But, if you see a thick layer of dirt blanketing your condenser, we recommend calling in a professional for an A/C deep cleaning.

    Even branches and leaves stuck in the condenser coils can cause major A/C problems.

    Check All Air Vents

    A/C issues caused by closed or blocked air vents:

    • A/C has trouble cooling your home
    • Ice on your refrigerant lines
    • Frozen evaporator coil
    • Water leaking from your A/C
    • Impaired compressor
    • Blower motor issues
    • Increased duct leakage (leading to higher A/C bills)

    Furniture, Rugs, or drapes can easily obstruct both return vents (vents that suck air in) and supply vents (vents that blow air out) so you’ll want to keep an eye out for blocked air vents throughout your home.

    A lot of homeowners also intentionally close supply vents in the rooms that aren’t being used because they believe they will save money on their energy bills. In reality, all that does is increase energy bills and can cause other A/C and ductwork issues.

    What to do: Take a walk throughout your home and make sure that all of your supply vents (both the return and supply) are open and not blocked—even the ones in rooms that aren’t being used.

    If you’ve tried everything on this guide but are still having A/C problems, you’ll need to hire a professional to diagnose and repair your A/C unit.


    “How to Troubleshoot Most Central AC Problems.” Plumbline, plumblineservices.com/help-guides/how-to-troubleshoot-most-central-ac-problems.

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