Why Is My Compressor Drawing Too Many Amps? Causes and Fixes

Why Is My Compressor Drawing Too Many Amps? Causes and Fixes

If you operate a rotary stationary or larger portable compressor, keeping an eye on electrical performance is just as important as watching air pressure or oil levels. High amp draw is a warning sign that your compressor is working harder than it should. Ignoring it can lead to higher energy bills or even permanent damage.

Here’s a look at the most common causes of high amp draw and what you can do about it.

1. Plugged Air/Oil Separator

A clogged air/oil separator increases system resistance, forcing the motor to pull more current to maintain performance. Regularly inspect and replace separators on schedule to avoid this hidden energy drain.

2. Airend Bearing Wear or Failure

Worn or failing bearings create internal friction, which makes the motor work harder and draw extra amps. Listen for unusual noises or vibration. Early detection can save major repair costs.

3. Obstructions in Air or Oil Lines

Blockages in piping, hoses, or oil lines reduce flow and add load to the motor. Check for restrictions, kinks, or built-up deposits during routine maintenance inspections.

4. Dirty or Spent Lubricant

Old or contaminated oil loses its protective properties, increasing internal resistance and causing higher electrical draw. Stick to your recommended oil change schedule to keep things running smoothly.

5. Incorrect Voltage or Electrical Supply Issues

If your electrical supply is unstable or not delivering correct voltage, the motor may compensate by drawing more amps. Have an electrician check your power setup and connections to ensure proper supply.

Fix It Before It Costs You More

High amp draw isn’t just an electrical issue. It’s a symptom of deeper mechanical or maintenance problems. Addressing these causes early helps avoid system failures and keeps your energy costs under control.