Why Won’t My Air Conditioner Turn On? Check These 6 Things

Is the scorching Nashville heat getting the better of you? If your air conditioner suddenly refuses to turn on, don’t panic. Before worrying about expensive repairs or replacements, let’s go through a quick troubleshooting guide that could save you time and money. By checking these six crucial factors, you might discover a simple fix that gets your AC unit up and running again. 


We’ll walk you through each step, from power supply issues to thermostat settings, air filters, condensate drains, outdoor unit maintenance, and safety switches. Say goodbye to the sweltering heat with our AC repair in Nashville!

Troubleshooting Guide

  1. Power Supply: Before assuming a significant issue, start with the basics. Check if your air conditioner is receiving power. Start by inspecting the electrical panel or fuse box in your home. Look for any tripped breakers or blown fuses related to your AC unit. If you find any, reset the breaker or replace the fuse. Additionally, ensure that the AC unit’s power switch (usually located near the outdoor condenser unit) is in the “On” position.
  2. Thermostat Settings: The next step is to examine your thermostat settings. Ensure it is set to “Cool” or “Auto” mode and the temperature is below the current room temperature. Sometimes, a simple adjustment to the thermostat settings can solve the problem. If you have a programmable thermostat, double-check that the schedule is not causing conflicts.
  3. Air Filter: A blocked air filter can restrict airflow and cause your air conditioner to malfunction. Check the air filter and see if it is dirty or blocked. If so, replace it with a new one according to the manufacturer’s instructions. Regularly changing your air filter is essential for efficient cooling and optimal performance of your AC unit.
  4. Condensate Drain Line: A blocked condensate drain line can trigger a safety mechanism that prevents your air conditioner from turning on. Locate the condensate drain line near the indoor unit, and inspect it for clogs or obstructions. If you notice a blockage, gently clear the line with a wet/dry vacuum or a pipe cleaner. Remember to follow safety precautions and refer to your AC unit’s manual for guidance.
  5. Outdoor Unit: The outdoor unit, or the condenser unit, is crucial in cooling your home. Ensure that there are no visible signs of damage or obstruction, such as debris or vegetation. Clear away any leaves, branches, or dirt that might be obstructing the unit’s airflow. Also, check if the condenser’s circuit breaker (usually in a nearby electrical box) is in the “On” position.
  6. Tripped Safety Switch: Modern air conditioning systems often feature safety switches that automatically turn off the AC unit if certain conditions are not met. Check if any safety switches, such as high-pressure or low-pressure, have been triggered. These switches are typically located near the outdoor unit. If any are tripped, it may indicate an underlying issue that requires professional attention from an HVAC company in Nashville, like Dunham Service.

Contact Us Today

By following these six troubleshooting steps, you can identify and resolve issues preventing your air conditioner from turning on. However, if you have checked all these things and your AC unit still won’t start, it’s time to contact a professional air conditioning service in Nashville. Dunham Service has a team of skilled technicians ready to assist and guide you with any HVAC problems you may encounter. Stay cool and comfortable! Don’t hesitate to contact us and book an appointment for reliable AC services in Nashville, MI, and surrounding areas.