Outside Ac Unit Fan Wont Come On

Introduction

If your outside AC unit fan won’t come on, it can quickly lead to an uncomfortable and potentially costly situation. The fan’s job is to dissipate heat from the refrigerant, allowing your AC to cool your home effectively. When it’s not working, your AC system struggles, leading to poor cooling, higher energy bills, and potential damage to other components. This problem often surfaces on hot days when the AC is working overtime. Addressing it promptly can prevent bigger problems and save you money on repairs and energy costs. Don’t panic! Many issues can be resolved with simple troubleshooting steps.

Common Causes of outside ac unit fan wont come on

Here are some of the most common reasons why your outside AC unit fan might not be spinning:. For more related activities, check out our My Aircon Suddenly Stopped Working.

• Power Issue: The AC unit isn’t receiving power. This could be a tripped breaker or a disconnected wire.
• Capacitor Failure: The capacitor is a small electrical component that helps start the fan motor. If it fails, the fan won’t start.
• Fan Motor Problem: The fan motor itself could be burned out or have internal damage.
• Obstruction: Debris like leaves, sticks, or even a bird’s nest can block the fan blades, preventing them from spinning.
• Wiring Problems: Loose or corroded wires can interrupt the flow of electricity to the fan motor.
• Contactor Problems: The contactor is a switch that supplies power to the fan motor and compressor. If it’s faulty, the fan may not receive power.
• Overheating: The motor might have overheated, causing a safety mechanism to shut it down.
• Frozen Coil: If the inside AC coil is frozen, it can indirectly affect the outside unit’s fan operation.

Symptoms Checklist

These symptoms can help you pinpoint the problem:

• The inside AC is blowing warm air.
• The outside AC unit is running (compressor humming), but the fan is not spinning.
• The outside AC unit is completely silent.
• You hear a humming sound from the outside unit, but the fan doesn’t start.
• The circuit breaker for the AC unit trips frequently.
• The fan blades are visibly blocked by debris.

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

1. Safety First! Turn off the power to the AC unit at the breaker box. This is crucial to prevent electrical shock.
2. Inspect the Breaker: Go to your electrical panel and check the breaker for the AC unit. If it’s tripped (in the middle position), flip it all the way off and then back on.
3. Check the Power Disconnect: Near the outside AC unit, there’s usually a disconnect switch. Make sure it’s in the “on” position. Some are pull-out switches; ensure it’s fully inserted.
4. Visually Inspect the Fan: Look for any obvious obstructions blocking the fan blades. Remove any leaves, twigs, or debris.
5. Try Spinning the Fan Blade Manually: Using a stick or gloved hand (power OFF!), gently try to spin the fan blades. If they spin freely, it’s less likely a mechanical issue. If they’re stiff, something is blocking them, or the motor bearings might be bad.
6. Check for Loose Wiring: Open the access panel on the outside unit (after shutting off the power!). Look for any loose or corroded wires connected to the fan motor or capacitor. If you find any, gently try to reconnect them or clean off any corrosion.
7. Inspect the Capacitor: The capacitor is usually a cylindrical component. Look for any signs of bulging, leaking, or puffiness. If you see any of these, the capacitor is likely bad (but don’t touch it, even with the power off, unless you know how to safely discharge it call a professional).
8. Check the Contactor: The contactor is a switch that controls power to the fan and compressor. Look for any signs of burning or damage. With the power off, gently press the contactor in. If it feels loose or sticky, it may be faulty.
9. Clean the Outside Unit: Use a garden hose (with a gentle spray setting) to clean the outside unit, removing any dirt and debris that could be causing it to overheat.
10. Wait and Try Again: After cleaning and inspecting, wait about 30 minutes for the motor to cool down (if it was overheated). Then, turn the power back on and see if the fan starts.
11. Observe Carefully: When power is restored, watch the fan closely. Does it attempt to start but fails? Does it make any unusual noises? This information can help a technician diagnose the problem.
12. Note the Compressor: Is the compressor running? If the compressor is off and the fan isn’t working, that could indicate other issues besides just the fan itself.

Fix the Issue Without Buying Parts

Before considering replacements, try these free methods:

• Resetting the Breaker: As mentioned, try resetting the breaker for the AC unit. Sometimes a simple reset is all it takes.
• Thorough Cleaning: Make sure the outside unit is free of any debris that could be blocking the fan or causing overheating.
• Visual Inspection: Carefully inspect all wiring connections and components for any signs of damage or corrosion.
• Maintenance Basics: Regularly clean the outside unit and replace the air filter in your indoor unit. A clogged air filter can restrict airflow and cause the outside unit to work harder, potentially leading to overheating.

When Replacement Might Be Necessary

If you’ve tried all the troubleshooting steps and the fan still won’t start, you might need to replace some parts. The most common parts to fail are the capacitor and the fan motor.Replacing a capacitor typically costs between $75 and $250, including labor. Replacing the fan motor can range from $200 to $600, including labor. In some cases, a bad contactor can also prevent the fan from running, costing around $100-$300 to replace.

Safety Warning

• Always turn off the power to the AC unit at the breaker box before performing any inspection or repairs.
• Never touch any electrical components with wet hands or while standing on a wet surface.
• If you’re not comfortable working with electricity, call a qualified HVAC technician.
• Be careful when working around the fan blades, even with the power off. They can be sharp.

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Pliers
• Wire stripper/cutter
• Gloves
• Work Light
• Garden Hose

FAQ

Here are some frequently asked questions about AC fan issues:

• Q: My AC fan makes a humming noise but doesn’t spin. What’s wrong?A: This often indicates a capacitor failure or a problem with the fan motor itself.
• Q: How can I tell if my AC capacitor is bad?A: Look for signs of bulging, leaking, or puffiness. However, it is best to call a professional as capacitors store electricity and can be dangerous to handle.
• Q: My AC fan starts and stops intermittently. What could be the cause?A: This could be due to overheating, a loose connection, or a failing capacitor.
• Q: How often should I clean my outside AC unit?A: It’s recommended to clean it at least once a year, preferably before the start of the cooling season.

Conclusion

Don’t let a malfunctioning outside AC unit fan leave you sweltering! By following these troubleshooting steps, you can often diagnose and fix the problem yourself, saving time and money. However, if you’re uncomfortable working with electricity or if the problem persists, don’t hesitate to call a qualified HVAC technician. Remember, safety always comes first!

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