5 Common Air Compressor Problems and How
to Fix Them
Air compressors are essential tools in a variety of industries, from construction and
automotive to manufacturing and home use. Like any equipment, they can develop issues
over time, which can hamper productivity. Knowing the common problems air compressors
face and how to fix them can save you time and costly repairs. In this article, we’ll explore
five frequent air compressor problems and offer practical solutions to get your compressor
back up and running.
1. Air Compressor Won't Start
One of the most common issues users encounter is an air compressor that won’t start. This
can be caused by several factors, including electrical problems or a faulty pressure switch.
Possible Causes:
● Power supply issues: The compressor may not be receiving enough power.
● Blown fuse: If the fuse is blown, the compressor won’t receive electricity.
● Faulty pressure switch: This component controls when the compressor turns on
and off based on pressure levels.
How to Fix It:
● Check the power supply: Ensure the compressor is plugged into a functioning
outlet.
● Replace the fuse: If the fuse is blown, replace it with one that matches the
compressor’s specifications.
● Inspect the pressure switch: If the pressure switch is faulty, it may need to be
adjusted or replaced.
2. Compressor Running But Not Building Pressure
When your compressor runs but doesn't build pressure, it could be due to leaks, worn
components, or an improperly adjusted pressure regulator.
Possible Causes:
● Air leaks: Small leaks in hoses or fittings can prevent the compressor from building
pressure.
● Worn out piston rings: Over time, piston rings can wear out, reducing the
compressor's ability to build pressure.
● Pressure regulator issues: If the regulator is set too low or malfunctioning, it may
prevent adequate pressure from being built.
How to Fix It:
● Check for leaks: Spray soapy water around fittings and hoses to detect air leaks and
tighten or replace the faulty parts.
● Inspect piston rings: If worn, these should be replaced by a technician.
● Adjust or replace the pressure regulator: Make sure it is correctly adjusted
according to your compressor's needs.
3. Compressor Overheating
Overheating is a significant issue that can lead to permanent damage to the compressor if
not addressed promptly. It usually happens due to poor ventilation or overuse.
Possible Causes:
● Inadequate ventilation: Compressors need airflow to keep the motor cool.
● Excessive usage: Running the compressor for extended periods without breaks can
cause it to overheat.
● Dirty filters: Blocked air filters restrict airflow, causing the motor to work harder
and overheat.
How to Fix It:
● Improve ventilation: Ensure the compressor is positioned in a well-ventilated area.
● Take breaks: Avoid running the compressor continuously for long periods; allow it
to cool down between uses.
● Clean or replace air filters: Regularly check and clean air filters to prevent
clogging.
4. Unusual Noises
Hearing unusual noises from your air compressor, such as knocking, rattling, or clicking
sounds, is a sign that something isn’t right. These noises can stem from worn parts, loose
components, or insufficient lubrication.
Possible Causes:
● Loose bolts: Loose bolts or parts can cause rattling sounds.
● Worn bearings: Bearings may wear down over time, leading to knocking noises.
● Low oil levels: Insufficient lubrication can cause clicking sounds from internal
moving parts.
How to Fix It:
● Tighten bolts and screws: Inspect the compressor and tighten any loose bolts.
● Check the bearings: If bearings are worn, they will need to be replaced by a
professional.
● Lubricate the compressor: Check the oil levels and top them off if necessary,
following the manufacturer’s guidelines.
5. Oil in Compressed Air
If you notice oil in the compressed air, it could be a sign of a serious issue, such as damaged
seals or worn piston rings.
Possible Causes:
● Worn piston rings: Damaged rings allow oil to seep into the compressed air.
● Damaged seals: If the seals are compromised, they won’t properly keep oil out of
the air stream.
How to Fix It:
● Replace piston rings: If the rings are worn, they need to be replaced.
● Inspect and replace seals: Ensure the seals are intact and replace them if damaged.
Conclusion
While air compressors are robust machines, they can encounter issues like any other
equipment. Knowing how to troubleshoot common air compressor problems can extend
the life of your equipment and keep it functioning efficiently. Regular maintenance, such as
checking for leaks, cleaning filters, and ensuring proper ventilation, can prevent many of
these problems before they arise. If you're unsure how to perform these fixes, always
consult a professional to avoid further damage to your compressor