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Popular Reasons Why Your Outside AC Unit May Not Turn On in Flagstaff,AZ

One of the worst things to happen during the summer is to have an outside AC unit that refuses to turn on. Besides the fact that you’ll be burning up in your home, you’ll know that you have a malfunctioning AC when you go outside to check the unit and it is simply not working at all, the fans aren’t spinning and there is absolutely no activity. There are many reasons why this may occur where there are some easy fixes whereas other reasons are complicated which require the help of a qualified HVAC company. We will now look at some of the most popular reasons why your outside AC unit may be refusing to function.

Thermostat Problems

So, the first thing you should do is check to see if your thermostat is working. If the display is blank, then you can try swapping in some new batteries. This may actually cause your AC to to turn on and your problem is fixed! However, if your thermostat still doesn’t come on then it may need to be replaced.

Contactors That Have Gone Bad

The contactor is basically a switch within your AC outdoor unit that effectively turns it on. If the contactor has gone bad or burned up, then your AC won’t turn on. All you’ll need to do is replace the bad contactor yourself or calling professional hvac flagstaff, AZ company and your unit should function.

Low Refrigerant Levels

If your AC is low on refrigerant levels then this may cause the pressure switch to trip. As a result, the AC won’t turn on at all and you’ll need a technician to check the system as well as top up the refrigerant.

Issues With The Breakers

The circuit breakers inside of your AC unit may go bad or they can simply get tripped, leading to the AC not working. If the breakers have only tripped, all you need to do is flip the switch and your AC should start to work. However, if this doesn’t work then your breakers may have overloaded and gone bad which would require an HVAC technician to repair.

Issues With Low Voltage Wires

Next, another common problem is that your outdoor AC unit may have some exposed or disconnected low voltage wires. There are many reasons why this can happen such as a careless gardener who cut it by mistake while tending to the plants nearby. The low voltage wires would simply need to be reconnected or replaced and you may be tempted to do this on your own, but it is best to leave that to the professionals.

Bad Fuse Or Capacitor

Unfortunately, the fuse in your AC may blow and this would simply happen from time to time. If this is the case, it simply needs to be replaced for your AC to work again. Also, it is possible for the capacitor to die as well. This typically happens after awhile when the capacitor reaches the end of its life span. The capacitor is necessary for your AC to start, so if it has gone bad, you’ll need to replace it with a new one.


These are just a few common reasons why an outdoor AC unit may refuse to turn on. Of course, there are many other possible reasons which is why it is best to hire a qualified HVAC technician who will diagnose and solve the problem.