Fan Wont Come On Outside Ac Unit

Introduction

If the fan on your outside AC unit isn’t spinning, it means your air conditioner isn’t cooling your home efficiently, or at all. This fan is crucial for releasing the heat generated during the cooling process. When it’s not working, your AC system can overheat, potentially leading to more serious and expensive problems. This is especially concerning during hot weather, as your home will become uncomfortable quickly. Addressing this issue promptly is key to preventing further damage and ensuring your AC system operates correctly.

Common Causes of fan wont come on outside ac unit

Here are some common reasons why the fan on your outside AC unit might not be working:

• Power Issues: The AC unit isn’t receiving power due to a tripped breaker or a disconnected power supply.
• Capacitor Failure: The capacitor, which helps start the fan motor, might be weak or completely failed.
• Motor Overload: The fan motor has overheated and tripped its internal overload protection.
• Dirty Fan Blades: Excessive dirt and debris on the fan blades can prevent the motor from starting.
• Physical Obstruction: Something is blocking the fan blades, preventing them from spinning freely.
• Worn Bearings: The bearings in the fan motor are worn out, causing the motor to seize.
• Wiring Problems: Loose or corroded wiring connections are preventing power from reaching the fan motor.
• Contactor Problems: The contactor, an electrical switch, might be failing to send power to the fan motor.
• Faulty Fan Motor: The fan motor itself is defective and needs replacement.

Symptoms Checklist

Use this checklist to accurately identify the issue:

• The fan blades are not spinning at all.
• You hear a humming sound coming from the outside unit, but the fan doesn’t spin.
• The AC unit is running, but the air coming from the vents inside is not cool.
• The circuit breaker for the AC unit keeps tripping.
• The fan blades spin freely when you manually turn them, but the motor doesn’t start.
• The outside unit is making unusual noises (grinding, squealing)

How to Fix fan wont come on outside ac unit Step-by-Step Guide

1. Turn Off the Power: Go to your circuit breaker panel and turn off the breaker that supplies power to your outside AC unit. This is a crucial safety step.
2. Inspect for Obstructions: Carefully examine the fan blades for any obstructions, such as twigs, leaves, or debris. Remove anything blocking the blades.
3. Clean the Fan Blades: Use a soft brush or cloth to clean the fan blades. Accumulated dirt can hinder the motor’s performance.
4. Check the Capacitor: The capacitor is a cylindrical component usually located near the fan motor. Visually inspect it for bulging, leaking, or other signs of damage. (Note: Capacitors can store a charge even when power is off. It is highly recommended to have a professional discharge and test the capacitor if you aren’t comfortable doing so.)
5. Check Wiring Connections: Inspect the wiring connections to the fan motor and capacitor. Make sure they are secure and free from corrosion. Tighten any loose connections.
6. Reset the Motor Overload: Some fan motors have a reset button. Look for a small button on the motor housing and press it.
7. Manually Spin the Fan Blades: With the power OFF, try spinning the fan blades by hand. They should spin freely. If they feel stiff or resist movement, the bearings might be failing.
8. Listen for Humming: With the power turned back ON briefly (and safely standing clear), listen closely to the outside unit. If you hear a humming sound, it might indicate the motor is trying to start but is unable to. Turn the power back off immediately.
9. Check the Contactor: The contactor is an electrical switch located inside the unit. With the power OFF, visually inspect it for signs of damage or burning.
10. Test the Power Supply: Use a multimeter (if you know how to use one safely) to check if the AC unit is receiving power. If not, investigate the breaker and wiring leading to the unit.
11. Wait and Restart: Sometimes, the motor might just need a little time to cool down. Turn off the AC unit for about 30 minutes and then turn it back on.

Fix the Issue Without Buying Parts

Here are some free methods to try before considering part replacements:

• Reset the Breaker: Sometimes, a simple breaker trip can cause the issue. Reset the breaker and see if the fan starts working.
• Thorough Cleaning: Regularly clean the fan blades and the surrounding area to prevent debris buildup.
• Visual Inspection Tips: Look for obvious signs of damage, such as broken wires, loose connections, or physical obstructions.
• Basic Maintenance: Keep the area around the outdoor unit clear of bushes and other obstructions to ensure proper airflow.

When Replacement Might Be Necessary

If the troubleshooting steps above don’t resolve the issue, you may need to replace a part. Here are some common parts that fail:

• Fan Motor: If the motor is completely dead or making loud grinding noises, it likely needs replacement. Estimated cost: $150-$400 (USD) plus labor.
• Capacitor: A failing capacitor is a common issue. Estimated cost: $20-$50 (USD) plus labor.
• Contactor: A damaged contactor can prevent power from reaching the fan motor. Estimated cost: $30-$70 (USD) plus labor.

Replacing these parts is best left to a qualified HVAC technician.

Safety Warning

• Always turn off the power to the AC unit at the circuit breaker before performing any troubleshooting or maintenance.
• Be careful when working around electrical components. If you are not comfortable, hire a professional.
• Avoid working on the AC unit in wet conditions.
• Capacitors can store an electrical charge even when the power is off. Discharge the capacitor before handling it. (Highly recommended a professional handles this step).

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Soft brush or cloth
• Wrench or pliers
• Multimeter (optional, for testing voltage – recommended for experienced users only)
• Work gloves

FAQ

Here are some frequently asked questions:

• Q: Why is my AC unit running but not cooling the house? A: The fan might not be working, preventing heat from being released.
• Q: How often should I clean my AC unit? A: At least once a year, preferably before the cooling season starts.
• Q: Can I replace the fan motor myself? A: If you have experience with electrical work, you can attempt it, but it’s recommended to hire a professional.
• Q: How do I know if the capacitor is bad? A: Visually inspect it for bulging or leaking, or have it tested by a professional.

Conclusion

Troubleshooting a non-functioning fan on your outside AC unit can seem daunting, but by following these steps, you can often identify and resolve the issue yourself. Remember to prioritize safety and turn off the power before starting any work. If you’re uncomfortable with any of these steps or the problem persists, don’t hesitate to call a qualified HVAC technician. Addressing the issue promptly will prevent further damage and keep your home cool and comfortable. Good luck!

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