It can be a frustrating experience to come home after a long, hot day of work only to find that your air conditioning isn’t working.
But don’t panic just yet! There are a few possible causes why your outdoor AC unit may not be turning on, and some of them might be more easily fixable than you think.
In this article, we will look at the most common reasons why your outside AC unit might not be turning on, as well as what you can do to troubleshoot the issue.
❄️ Why Your Outside AC Unit Is Not Turning On
First Things First, Is Everything Switched On?
As simple as it sounds, there are a number of issues that are caused by the necessary switches not being turned on.
These include:
The Shut-Off Switch Is Flipped
One of the most common reasons why an outside AC unit isn't turning on is because the shut-off switch has been flipped.
This can happen inadvertently, cutting off power to the unit and preventing it from functioning.
The shut-off switch is typically located at the back of the AC unit, near where the wiring connections are made.
If you find that this safety switch has been switched off, all you need to do is flip it back on, and your AC unit should return to normal functioning.
The Power Switch Of The Indoor Unit Is Switched Off
Sometimes the outside AC unit won't turn on because the power switch of the inside unit is switched off.
If this is your problem, you're lucky because there's an easy fix. You need to go inside and find the power switch for your AC unit and make sure it is switched on.
❄️ Other Reasons Why Your Outside AC Unit Isn't Turning On
Bad Air Conditioner Capacitors
Problems with air conditioner capacitors regularly lead to air conditioning systems failing to turn on.
A capacitor is a device that helps the fan motor, compressor, and other components in an AC unit start-up when they receive power.
When these capacitors are faulty, it will prevent the fan motor and compressor in ac units from turning on or running at full capacity.
The only way to fix a problem with capacitors is to have them replaced by a qualified technician.
They should be able to diagnose whether this is the issue as well as replace any faulty capacitors with new ones.
The Air Conditioner Thermostat Settings Are Wrong
The air conditioner thermostat settings are one of the most overlooked reasons for an outside AC unit not turning on.
If the thermostat is set too low, it can prevent the AC unit from powering up properly.
Likewise, if the thermostat is set too high, it can cause a power surge that will trip the circuit breaker and prevent the AC unit from receiving electricity.
To fix this problem, you'll need to reset the thermostat to its correct setting. If you find you still have problems after doing so, your thermostat is likely faulty and will need to be replaced.
Air Conditioner Compressor Failure
A failure of the air conditioner compressor can be a critical source of why an outside AC unit is not turning on.
The compressor helps to circulate the coolant through the AC system and allows it to cool down the air properly.
If the compressor fails, then it can prevent the unit from turning on or receiving power.
To diagnose and fix this issue, you will need to call in a qualified technician who can test and replace any faulty components.
Additionally, they should inspect all wiring connections to make sure they are secure and look for any corrosion that may have occurred over time.
Tripped Circuit Breaker
A tripped circuit breaker can be a major cause of why an outside AC unit isn't turning on.
This occurs when the current is too high in the outdoor unit, causing the breaker in the fuse box or main electrical panel to switch off power to the unit, resulting in it not receiving any electricity.
To fix this issue, you will need to reset the circuit breaker by switching it off and then back on again.
If this doesn't work, then you may need to check for any loose or corroded wiring connections, replace any faulty fuses or circuit breakers, and ensure that your AC system is getting enough power supply.
Clogs In The Condensate Drain Line
Clogs in the condensate drain line can also lead to an outside AC unit not turning on.
This occurs when the condensate drain is blocked by dirt, debris, or even algae growth due to moisture build-up.
As a result, the condensate will not be able to properly exit the cooling system, making it unable to cool down and resulting in the AC unit not receiving any power.
To fix this issue, you'll need to clear out the blockage and/or replace any corroded parts within the system that are preventing it from draining correctly.
Additionally, if algae growth is present, then it may be necessary to install a UV light to prevent further problems with clogs in the future.
Outdoor Air Conditioner Fan Is Broken
If the outdoor air conditioner fan is broken, it will prevent air from flowing efficiently through the system and becoming cooled properly.
This can cause several issues, such as a drop in refrigerant pressure or an overworking compressor, both of which can lead to an outside AC unit not turning on.
To fix this problem, the fan must be replaced by a qualified technician as they require a high deal of professional expertise to replace it and could be dangerous to work with otherwise.
Not Enough Refrigerant In The Unit
If there is not enough refrigerant in the unit, it can prevent the air conditioner from receiving enough power to turn on.
This often happens due to a leak or improper installation, which causes the refrigerant to spill out of the system and eventually lead to a decrease in pressure.
Without adequate pressure, the unit will not be able to cool down and will instead draw too much current, resulting in a power surge that could trip the circuit breaker.
To fix this issue, you'll need to call in a professional technician who can inspect for any leaks as well as replace the lost refrigerant.
❄️ The Role of Regular Maintenance
Regular maintenance can be a great way to prevent future AC problems and keep your unit running smoothly.
A qualified technician should inspect the unit at least once a year for any signs of wear and tear, such as damaged or corroded wiring connections, clogs in the condensate drain line, or insufficient refrigerant levels.
By doing this regularly, you can ensure that your AC system remains efficient and avoid costly repair bills down the line.
If you live in Pensacola, Florida, and want a professional service that will keep your AC system in peak condition, get in contact with us at Air and Energy of NWFL.
We have the experience and the know-how to provide the right service for you, no matter your air conditioning unit or HVAC system.
❄️ Final Thoughts
It's important to remember that an outside AC unit not turning on can be caused by a variety of factors, ranging from tripped circuit breakers or a blown fuse to broken fan motors or insufficient refrigerant levels.
If you need to get your AC unit fixed or are looking for maintenance that will keep it running reliably for years to come, get in contact with our professionally certified technicians at Air and Energy of NWFL.
Contact us, and reclaim your home from the heat!
This article was written by:
Co-founder and Home Comfort Specialist