Air Conditioner Not Working In House

Introduction

Finding your air conditioner not working in house on a hot day is a major inconvenience. It can quickly turn your home into an uncomfortable sauna. This problem is common during peak summer months when your AC is working overtime, or after a period of disuse. Ignoring a malfunctioning AC can lead to more significant (and expensive) repairs down the road, so addressing the issue promptly is important for your comfort and your wallet. Explore more in our Air Conditioner Troubleshooting 1 collection.

Common Causes of air conditioner not working in house

Several factors can cause your AC to fail. Here are some common culprits:

• Tripped Circuit Breaker: An overloaded circuit can cause the breaker to trip, cutting power to the AC.
• Dirty Air Filter: A clogged filter restricts airflow, causing the AC to work harder and potentially overheat.
• Frozen Evaporator Coil: Restricted airflow or low refrigerant can cause the coil to freeze up.
• Dirty Condenser Coils: Outdoor condenser coils can become covered in dirt, leaves, and debris, reducing their ability to release heat.
• Refrigerant Leak: Low refrigerant levels reduce the cooling capacity of your AC.
• Faulty Capacitor: Capacitors help start and run the AC’s motors. A failing capacitor can prevent the AC from turning on.
• Thermostat Issues: An incorrectly set or malfunctioning thermostat won’t signal the AC to turn on.
• Blocked Condensate Drain: A clogged drain line can trigger a safety switch that shuts down the AC.
• Compressor Failure: The compressor is the heart of the AC, and a failure here is a serious issue.

Symptoms Checklist

Use this checklist to help pinpoint the problem:

• The AC unit isn’t turning on at all.
• The AC is blowing warm air.
• The AC is making unusual noises.
• The AC is turning on and off frequently (short cycling).
• Ice is visible on the AC unit.
• Water is leaking from the AC unit.
• The circuit breaker for the AC has tripped.

How to Fix air conditioner not working in house Step-by-Step Guide

Here’s a step-by-step guide to troubleshooting your AC:

1. Check the Thermostat: Make sure the thermostat is set to “Cool” and the temperature is set lower than the current room temperature. Also, check the batteries if it’s a digital thermostat.
2. Inspect the Circuit Breaker: Locate the circuit breaker for the AC in your electrical panel. If it’s tripped (switch in the middle position), flip it all the way to the “Off” position, then back to the “On” position.
3. Replace the Air Filter: A dirty air filter is a common cause of AC problems. Replace it with a new, clean filter.
4. Check the Outdoor Unit (Condenser): Make sure the area around the outdoor unit is clear of debris, plants, and obstructions.
5. Clean the Condenser Coils: Use a garden hose (with a gentle spray nozzle) to clean the condenser coils. Spray from the inside out to remove dirt and debris. Be careful not to bend the fins.
6. Check for Ice on the Evaporator Coil: If you see ice on the indoor unit, turn off the AC and let it thaw for several hours. This could indicate restricted airflow or a refrigerant issue.
7. Clear the Condensate Drain Line: Locate the condensate drain line (usually a PVC pipe near the indoor unit). Use a wet/dry vacuum or a stiff wire to clear any clogs.
8. Inspect the Fan Motor: Make sure the fan blades on both the indoor and outdoor units are spinning freely. If they’re not, the motor may be faulty. Do not attempt to manually spin the fan while power is on.
9. Check the Power Disconnect Switch: Near the outdoor unit, there should be a power disconnect switch. Make sure it’s in the “On” position.
10. Listen for Unusual Noises: Pay attention to any unusual noises coming from the AC unit, such as rattling, hissing, or grinding. These noises could indicate a mechanical problem.
11. Check the Compressor Contactor: Located inside the outdoor unit is a contactor that starts the compressor. Visually check if the contactor is damaged. Note: working with electrical components can be dangerous, so only visually inspect the contactor unless you’re familiar with AC electrical repair.
12. Reset the AC: Some AC units have a reset button. Refer to your owner’s manual to locate and press the reset button.

Fix the Issue Without Buying Parts

Before you rush to buy new parts, try these free solutions:

• Regular Cleaning: Clean your AC unit and coils every few months to prevent debris buildup.
• Filter Replacement: Replace your air filter every 1-3 months, depending on usage.
• Thermostat Calibration: Check your thermostat’s accuracy and recalibrate it if necessary.
• Routine Inspections: Regularly inspect your AC unit for any signs of damage or wear.

When Replacement Might Be Necessary

If you’ve tried all the troubleshooting steps and your AC is still not working, it might be time for a replacement. Compressor failure is a common reason for replacement, as well as evaporator coil leaks. Replacing an AC unit can cost anywhere from $3,000 to $7,000, depending on the size and efficiency of the unit. Parts commonly failing include compressors, evaporator coils, condenser fan motors, and capacitors.

Safety Warning

• Always turn off the power to the AC unit at the circuit breaker before attempting any repairs.
• Avoid working on electrical components if you are not comfortable doing so.
• Be careful when using water near electrical equipment.
• Do not attempt to repair refrigerant leaks. This requires specialized equipment and training.
• Wear gloves and eye protection when cleaning the AC unit.

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Adjustable wrench
• Wet/dry vacuum
• Garden hose with a spray nozzle
• Air filter
• Gloves
• Eye protection

FAQ

• Q: My AC is blowing warm air. What could be the problem? A: This could be due to a dirty air filter, frozen evaporator coil, or low refrigerant levels.
• Q: Why is my AC making a loud noise? A: Unusual noises can indicate a mechanical problem, such as a faulty fan motor or compressor.
• Q: How often should I change my air filter? A: It’s recommended to change your air filter every 1-3 months, depending on usage and the type of filter.
• Q: What does it mean when my AC is “short cycling”? A: Short cycling means the AC is turning on and off frequently, which could indicate a problem with the compressor, thermostat, or refrigerant levels.

Conclusion

Troubleshooting a broken air conditioner can seem daunting, but by following these steps, you can often identify and fix the problem yourself. Remember to prioritize safety and take your time. If you’re uncomfortable with any of these steps, or if the problem persists, don’t hesitate to call a qualified HVAC technician. Often a DIY approach can save you money and provide a solution, but never hesitate to call a professional if required.

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