Compressor Shuts Down Due to High Temperature
Is Your Compressor Overheating and Shutting Off?
If your compressor runs for a while and then shuts down unexpectedly, especially on hot days, you’re likely dealing with a high temperature trip. This is a built-in safety feature designed to protect your machine, but if it keeps happening, something’s wrong. Whether you’re running a reciprocating compressor, a portable rotary screw, or a stationary rotary screw, here’s how to troubleshoot it.
If You Have a Reciprocating or Portable Rotary Screw Compressor
Overheating on these models is typically related to poor ventilation, low oil levels, or dirty components. Because they’re often used in tough environments, cooling systems need a little more attention.
Common Causes:
- Low Oil Level – Not enough oil = not enough heat absorption.
- Clogged Oil Filter – Blocks flow, increases friction, and raises temps fast.
- Blocked Cooler or Airflow Path – Dust, dirt, or debris on the cooler restricts airflow.
- High Ambient Temperatures – Hot day + enclosed space = trouble.
- Faulty Temperature Switch – May shut down prematurely or fail to reset.
What to Do:
- Check and top off oil to the proper level. Not too low, not too full.
- Replace clogged oil filters. Don’t wait for a pressure drop to act.
- Clean your cooler fins and make sure nothing is blocking airflow.
- Move the unit to a shaded or ventilated area if outdoors.
- Test the temperature switch and replace it if it won’t reset or trips early.
If You Have a Stationary Rotary Screw Compressor
Rotary screw units have more advanced thermal protection, but they’re also more sensitive to airflow, oil flow, and component performance. High temp shutdowns in these systems often relate to maintenance intervals being missed, or environmental challenges.
What to Look For:
- Low Oil Level or Poor Oil Quality – Thin or dirty oil reduces heat transfer and causes internal stress.
- Plugged Cooler or Filter – A dirty oil cooler or air/oil separator increases temps across the system.
- Failing Thermal Bypass Valve – If it sticks, oil may not reach the cooler at all.
- Ventilation Problems – Compressors placed in enclosed, unventilated rooms overheat quickly.
- Faulty Temperature Sensor or Controller Input – May trip prematurely or ignore rising temps.
Solutions:
- Change your oil and filter if it’s due, or earlier in high-temp seasons.
- Clean your cooler regularly and inspect for oil-fouled fins.
- Test or replace your thermal bypass valve if the cooler isn’t warming up.
- Ensure proper ventilation and ducting for intake and exhaust airflow.
- Use controller diagnostics to verify temperature readings and sensor response.
Keep Your Compressor Running Cool
For Reciprocating and Portable Compressors
- Monitor oil levels weekly or even more frequently in hot conditions.
- Clean cooler fins and intake screens monthly.
- Avoid running machines in enclosed spaces without ventilation.
For Stationary Rotary Screw Compressors
- Schedule cooler and filter inspections every 2,000 hours or sooner.
- Verify ventilation design can handle ambient heat and exhaust air.
- Use high-quality synthetic compressor oil with a proper viscosity rating.