Reasons and Signs Associated With Failure of AC Capacitor

If you work on HVAC systems, you should be familiar with the distinction between run capacitors and start capacitors. Both play important roles in an air conditioning system, but in distinct ways. In this article, we’ll discuss how HVAC systems function and the role that run and start capacitors play. You can also get access to find out signs associated with failure of AC Capacitor by visiting

1. Humidity:

Humidity is another potential threat to a capacitor’s health. Capacitors can have their dielectric material deteriorate when exposed to high humidity. Because of this deterioration, capacitors can fail. To get more information about this, you can visit  

Corrosion on the electrode’s terminals due to humidity can also increase resistance and cause the system to fail. Atmospheric pollutants like sulfur dioxide and chlorine also play a role in accelerating corrosion. Corrosion of the metal electrodes may result from contact with these substances.

2. Extreme Heat:

It goes without saying that extreme heat is one of the most common causes of failure in electronic components. Capacitors are particularly susceptible to this because they typically need to work at very high temperatures.  

Avoiding the capacitor’s maximum temperature of operation can help protect it from this kind of damage. Second, implement thermal management strategies to maintain a cool capacitor. A heatsink or just locating the capacitor’s location in an area with plenty of ventilation are two possible solutions.

3. Smell Coming Out from the Unit:

Burning odor emanating from the device: a faulty capacitor. When this happens, it is not uncommon to hear a quiet “pop,” and in some cases, smoke may be seen or smelled coming from the air conditioner itself. The odor of smoke may remain a little longer at times.

4. React Slowly Or Slowly At All:

You tell your unit to turn down the air conditioning. There is a pause, but no response from your air conditioner. Hold tight. It takes a few minutes, but then it begins functioning normally. Remember that? A capacitor has failed.

5. Did Not Show Any Voltage:

The most reliable technique to determine if new capacitors are required without physically replacing them is if point number five above occurs. If you have access to a voltmeter, I would recommend trying this out first.

Capacitors can fail for a number of reasons, but overheating is a common one. If the capacitor’s internal temperature rises above 150 degrees Fahrenheit, it will fail to store a charge. An AC capacitor can overheat for a variety of causes.

6. Overheating:

The capacitor will absorb a lot of heat from the sun if the condenser is placed where it will be directly exposed to sunlight. Although the air conditioner is working hard to maintain the temperature of your home, the condenser unit generates heat, which can cause the capacitor to heat up.

7. Congested Filters:

If you fail to change your air conditioner’s filters regularly, it will have to work more than it has to. Reduced airflow from the returning ducts to the evaporator coil is a direct result of a clogged air filter. The capacitor will get hot if the filthy filters are neglected for too long.

8. Dirty Coils:

Cleaning your AC coils on a regular basis to keep the air and refrigerant moving freely. The entire system (as well as the capacitor) will become hot if they have to work more than usual to cool the home if the coils are unclean.

9. Leaking Refrigerant:

It causes your air conditioner to work harder than necessary, which is problem number ten on our list. Because of the increased load, the capacitor is likely to overheat & fail.

10. Undersized Capacitor:

Replace a faulty capacitor with another that has a decreased voltage & capacitance rating if you try the repair yourself or if you hire inexperienced workers. Because of the incorrect voltage, the replacement capacitor will fail fast.

One possible concern is whether or not it is safe to utilize a capacitor with greater voltage and capacitance. Surprisingly, many experts in the field advise going with a “oversized” capacitor.

11. Capacitor Age:

Capacitors behave similarly to other electrical components as they age. Over time, they can break down from regular use. Capacitors have an indeterminate lifespan, but you may safely expect yours to survive more than a decade under normal conditions. The capacitor may not always be the immediate target of wear and tear. Your capacitor will probably stop working if its connections become loose or corroded.