Ac Outside Is Not Turning On

Introduction

Is your outside AC unit silent when it should be humming along, keeping your home cool? When your AC outside is not turning on, it can quickly lead to uncomfortable temperatures indoors, especially during hot weather. This issue often arises unexpectedly and can be caused by several factors, from simple fixes to more complex problems. Addressing this promptly is crucial to prevent further damage to your system and avoid soaring energy bills.

Common Causes of ac outside is not turning on

Here are some common reasons why your outside AC unit might not be starting:

Tripped Circuit Breaker: An overloaded circuit can cause the breaker controlling your AC to trip, cutting off power to the unit.
Disconnected Power: Someone may have accidentally switched off the disconnect switch near the outdoor unit, or the unit may have a loose connection to the building.
Thermostat Setting: The thermostat may not be properly set to “Cool” or the temperature setting may be too high.
Dirty Air Filter: A clogged air filter restricts airflow, causing the AC unit to overheat and potentially shut down.
Frozen Evaporator Coil: Restricted airflow or low refrigerant can cause the evaporator coil inside the indoor unit to freeze, preventing the outdoor unit from starting.
Faulty Capacitor: The capacitor is a small component that helps start the AC motor. If it’s weak or damaged, the motor won’t start.
Dirty Condenser Coils: The outdoor unit’s coils release heat. If they’re covered in dirt and debris, the unit can overheat and shut down.
Refrigerant Leak: Low refrigerant levels can prevent the AC from cooling properly and may stop the outside unit from turning on.
Overheated Compressor: The compressor is the heart of the AC system. If it overheats due to various reasons, it might shut down with the unit.

Symptoms Checklist

Use this checklist to pinpoint your AC issue:

The outdoor unit is completely silent no fan or humming sound.
The indoor fan is blowing, but the air is not cold.
The circuit breaker for the AC is tripped.
The outdoor unit’s fan spins freely when pushed with a stick (power off!).
Ice is visible on the copper pipes leading to the outdoor unit.
You hear a clicking sound from the outdoor unit, but it doesn’t start.
The thermostat display is blank.
The air filter is visibly dirty.

How to Fix ac outside is not turning on Step-by-Step Guide

Follow these steps to troubleshoot your AC:

Check the Thermostat: Make sure the thermostat is set to “Cool” and the temperature is set at least 5 degrees below the current room temperature.
Inspect the Circuit Breaker: Locate the circuit breaker for your AC unit (usually labeled). If it’s tripped (in the middle position), flip it fully off and then back on.
Check the Disconnect Switch: Find the disconnect switch near the outdoor unit (it looks like a light switch). Ensure it’s in the “On” position.
Replace the Air Filter: A dirty air filter restricts airflow. Replace it with a clean one, making sure to note the direction arrow on the new filter when installing.
Inspect for Ice: Check the copper pipes entering the outdoor unit for ice buildup. If you see ice, turn off the AC and let it thaw for several hours.
Clean the Condenser Coils: Use a garden hose (with a gentle spray nozzle) to clean the outdoor unit’s coils. Remove any leaves, grass, or debris. Be careful not to bend the fins.
Check Capacitor (visually): With the power OFF to the unit, open the access panel to where the fan motor is. Locate the capacitor (looks like a metal cylinder). Look for any bulging, leaking, or corrosion on the capacitor. If any of these are present, consider calling a technician.
Check Fan Blade Rotation: With the power OFF, carefully try spinning the fan blade of the outdoor unit. It should spin relatively freely. If there is resistance, it could indicate a problem with the motor.
Wait and Restart: Sometimes, the compressor can overheat and shut down. Turn off the AC and give it 30 minutes to an hour to cool down before restarting.
Check for Obstructions: Ensure nothing is blocking the airflow around the outdoor unit (e.g., bushes, furniture).
Power Cycle the Unit: Turn off the AC at the breaker for 10 minutes, then turn it back on. This can sometimes reset the system.

Fix the Issue Without Buying Parts

Many AC problems can be resolved without replacing parts:

Resetting the System: As mentioned above, turning the power off at the breaker for 10 minutes can sometimes reset the AC unit’s electronics.
Cleaning: Regularly cleaning the air filter and condenser coils is crucial for maintaining airflow and preventing overheating.
Inspection: Periodically inspect the unit for any signs of damage, such as loose wires or corroded components. Catching these issues early can prevent bigger problems.
Proper Thermostat Setting: Make sure the thermostat is set correctly for efficient cooling and to avoid unnecessary strain on the system.

When Replacement Might Be Necessary

If the troubleshooting steps above don’t resolve the issue, a replacement part or even the entire unit might be necessary. Common parts that fail include:

Capacitor: $50 – $200
Fan Motor: $150 – $500
Compressor: $800 – $2000 (often more cost-effective to replace the entire unit)

Replacing the entire outdoor AC unit can range from $3,000 to $7,000, depending on the size and efficiency of the new unit.

Safety Warning

Always turn off the power to the AC unit at the circuit breaker before performing any maintenance or repairs.
Avoid working on the AC unit in wet conditions.
Never touch electrical components with wet hands.
If you’re uncomfortable working with electricity, call a qualified technician.
Be cautious when cleaning the condenser coils, as the fins can be sharp.

Tools You May Need

Screwdrivers (Phillips and flathead)
Garden hose with spray nozzle
Air filter
Multimeter (optional, for testing electrical components – best left to professionals)
Gloves

FAQ

Here are some frequently asked questions:

Q: Why is my AC turning on and off repeatedly? A: This could be due to a dirty air filter, frozen evaporator coil, or a faulty capacitor.
Q: How often should I clean my AC coils? A: At least once a year, preferably before the start of the cooling season.
Q: What if my AC unit is making a loud buzzing noise? A: This could indicate a problem with the capacitor or compressor. Call a technician.
Q: How do I know if my AC is low on refrigerant? A: Signs include weak airflow, ice buildup on the copper pipes, and the unit not cooling effectively.

Conclusion

Troubleshooting why your AC outside is not turning on can often be done with a few simple steps. By checking the basics and following this guide, you can potentially save yourself the cost of a service call. However, if you’re uncomfortable working with electricity or the problem persists, don’t hesitate to contact a qualified HVAC technician. Prioritizing safety is always the best approach!