It is another hot, sunny day but you are thankfully inside waiting to enjoy your central air conditioner. Unfortunately, the temperature in your home seems to keep rising and it is because your otherwise trusty central a/c will not kick on. Luckily, there are several common reasons why our central air conditioner will not turn on many have a quick, expensive fix.

Here are a few of the most common reasons why your central air conditioner will not turn on.

Broken Thermostat

The best first place to look for any issues with your central air conditioner is the thermostat. A faulty thermostat will mean your HVAC unit cannot read the surrounding temperature. Begin by checking the thermostat's batteries. Most newer thermostats will feature an alert that tells you when the batteries are running low.

If the batteries are new, make sure that the thermostat is set to the "cold" setting and that that fan is set to "on" or "auto." An older model thermostat may be broken altogether and require replacement. Contact an HVAC technician to test the thermostat and its connections. If the thermostat is broken, the HVAC technician can help you choose a new model and install the thermostat properly.

Tripped Breaker

Another common problem is a tripped circuit breaker. The circuit breakers are found in the breaker box, which is typically found in the basement, a utility room, or your garage. The position of the breaker that controls your HVAC unit will be marked on the breaker box's door. If the breaker is not switched to the "on" position, the breaker is tripped, and the breaker must be reset.

According to Bob Vila, there are several reasons why your breaker will trip. For example, there might be a short circuit or the breaker could be overloaded. If after you reset the breaker, if it continues to trip and your central air will not turn on, contact an electrician.

Clogged Evaporator Coil

The evaporator coils are in the condenser, which is the large metal box that is either on your roof or next to your house. The evaporator coil contains the refrigerant. It is the refrigerant's job to absorb the heat from inside your home. The evaporator coil works in tandem with the condenser coil to keep the air comfortable inside your home.

Unfortunately, because the evaporator coil is outside, it can easily be clogged with dirt, debris, and other contaminants. Your HVAC technician can examine your evaporator coil and determine if it is clogged and can be cleaned or if the evaporator coil is damaged and must be replaced.

Leaking Refrigerant

Finally, another common cause of a non-working central air conditioner is leaking refrigerant. As mentioned above, the refrigerant is vital because it helps transfer hot air from inside your home. The refrigerant is located in a series of copper pipes inside the condenser that protects the refrigerant from leaking. There may be damage to the copper, which can occur if the condenser is damaged by the elements or if the copper degrades over time.

When there is little or no refrigerant, the coils will eventually freeze, and the system will stop working. You may notice a gurgling or hissing sound coming from the coils, which is also a sign that refrigerant is slowly leaking out. An HVAC technician can check for frozen coils and if there is a refrigerant leak, the technician can repair any damage and refill the unit with refrigerant. Never try to refill refrigerant on your own, as this is a delicate procedure and requires the right tools and expertise.

From leaking refrigerant to a faulty thermostat or tripped breaker, there are several reasons why your central air conditioner will not turn on.

For more information, contact a local air conditioning service.