Top Things To Check When Your Air Conditioner is Not Turning On

Top Things To Check When Your Air Conditioner is Not Turning On

Top Things To Check When Your Air Conditioner is Not Turning On

Most people don’t think about their air conditioner in the winter months. In fact, they may not even think about it until it starts to get hot and they need to turn it on.

Unfortunately, this approach means that you probably haven’t had it serviced and your next call is likely to be to a reputable industrial air conditioning specialist.

However, before you panic, if the AC unit won’t even turn on, there are a few things that you can try before you get the professionals involved.

The Power Supply

The most obvious and thankfully likely issue when you have a problem with your AC unit is that there is simply no power. You’ll need to go to the main power box in your home to check that the circuit breaker is on for your Ac unit. There are many reasons it could be off from turning it off on purpose to an issue with the breaker.

Turn it back on and check the wiring to the AC unit. If there is a live supply to the AC unit then you can try turning it on again.


When the AC unit appears to come on but doesn’t do anything then the issue isn’t the power to the unit, it’s the control of that power. In this instance, that’s the thermostat. Check your thermostat. The first issue is that the thermostat is set too high. In effect it doesn’t think the room needs cooling so isn’t telling the unit to come on.

Turn the thermostat to see if that helps. If it doesn’t you may have a faulty thermostat that needs to be checked.

Internal Power Switch

You may not realize it but many Ac units have their own power switch. In essence, your circuit breaker is wired to the switch and this supplies the power to the unit. But, if the power switch is off the unit won’t spring to life.

Check the walls around your Ac unit and you may find a switch that is waiting to be turned on. It can help to label this switch. That will ensure you know where it is in the future and that it isn’t accidentally turned off while in use.

Problem With Condensate Drain Line

All air conditioners create water, it’s a by-product of cooling the air as cooler air is less capable of holding moisture. This water has to go somewhere. You’ll find there is a drain line coming off the unit and away from the house.

If this is clogged with anything then the AC unit won’t be able to pump water away and an internal safety switch will trip, preventing the unit from turning on.

Unblock the drain line and it will work perfectly again.

There are other minor issues that can go wrong with your AC unit. But, you should remember that this is an expensive and potentially dangerous piece of equipment. In many cases, you are better off getting the ac repair Denver services to sort the issue for you.