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Help! My AC Unit Doesn’t Come On

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If your AC unit doesn’t come on, there are a number of things that could be wrong. Sometimes, with a little luck you can quickly and easily determine the cause – and perhaps even correct this annoying problem yourself.

Here are 4 common reasons your AC unit won’t come on – along with some details about what to do to get your house cool again:

  • 1 Check out the thermostat.

Make sure the thermostat is set correctly before you call for help or check anything else. Maybe you looked at it too early in the morning and got confused. Maybe your spouse or a child turned it off. Or maybe it’s malfunctioning. There could be a power issue causing the thermostat to not work, and some units need fresh batteries frequently. Make sure yours is working, is set to cool and is set at least 3 degrees below the current room temperature. If there’s no obvious problem with the thermostat, it’s time to look for other causes.

  • 2 Look over your circuit breakers.

The reason your AC unit doesn’t come on could be as simple as a tripped breaker. This can be due to a power surge from the electric company or from someone overpowering the circuit, but don’t just turn it back on and forget it. Stay close and make sure it doesn’t turn back off quickly. If it does, you need an HVAC technician to assess your system because there’s probably a mechanical problem. Remember that to properly reset a circuit breaker, you must first turn it all the way off before you try to turn it on.

  • 3 Make sure the drain pan is OK.

Indoor AC units have a drain pan under them meant to accumulate condensation that doesn’t drain from the unit. This drain pan may have a float switch that will cause the unit to turn off if it’s triggered. And that’s a good thing – because the pan would run over and do damage if it wasn’t there. Remove the water from the pan to get the unit working again, but look for clogged drain hoses or other causes to prevent it from happening again. You should also have your HVAC system professionally serviced as soon as possible to make sure the drain stays clear.

  • 3 Flip the AC shutoff switch.
Some systems have a shutoff switch that turns the unit off completely. It usually looks like a regular light switch and is located near the inside part of the AC system. This switch is intended for use by a service technician to cut power during repairs, but it can easily be flipped during dusting or wiping down the area as well. If you’re not sure which position is on and which is off, flip it and see if the unit comes on.

No matter the cause of your AC unit not coming on, an HVAC technician can diagnose the reason and get your system working again so that everyone in your household is comfortable again. So check a couple of things yourself, then if nothing works, depend on the experts to get your system working right.

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