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Why Won’t My Air Conditioner Turn On?

May. 18, 2017
With temperatures rising this week many of us are turning on our air conditioners for the first time this year.  For many, it will start right up – no problem.  But, there are always a few stubborn units that would prefer to stay in hibernation.  Before you begin to panic, try these five simple steps to see if you can start up your A/C unit on your own.

Step 1: Check the thermostat
It might sound silly, but the first thing a service technician will check is your thermostat.  Make sure that your thermostat is set to “cool,” not “heat.”  Next, make sure it is set at least 3 degrees colder than the current room temperature.  Lastly, check to see if the “low battery” warning is on – and it might be a good idea to replace your batteries anyways, just in case.

Step 2: Check the main electrical panel
An electrical surge may have occurred since the last time you used your air conditioner.  Check your fuse box or circuit breaker for a blown fuse or tripped circuit.

If this is the case, and your air conditioner turns on then blows a fuse again, it may be drawing too much electricity and you should call an HVAC technician to diagnose the problem.

Step 3: Check the air filter
In many homes, the same air filter is shared by both the furnace and air conditioner.  A dirty filter restricts airflow and can cause your unit to not work.

Step 4: Check the condensate drain line
Air conditioners naturally create condensation when cooling the air, but if your condensate line becomes clogged, a safety switch will trip and your air conditioner will be shut down.  Try using a wet/dry vacuum to suck the blockage from the condensate drain line.

If you have a condensate drain pump, which pumps the water out of the home, you should check this too since a broken pump will also trip the safety switch.

Step 5: Call an HVAC technician
If the steps above work, but only for a short time, or if your air conditioner has still not turned on, it is time to have an HVAC professional examine your system.

Our team of HVAC professionals are available to help with any air conditioning issues you may have.  Call us or schedule an appointment online.
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Thornton & Grooms
24565 Hallwood Ct
Farmington Hills, MI 48335
(248) 644-7810
Mon-Fri: 7am-7pm
Sat: 8am-4pm
Sun: Closed
24/7 for Emergency Service
MI Plumbing Lic. #: 8106666
MI Contractors Lic. #: 7100232
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