Air Compressor Troubleshooting
Independent troubleshooting help to diagnose and fix air compressor problems quickly — and minimize unscheduled production downtime. Manufacturer-neutral, drawn from 20+ years of field work, with steps that apply across rotary screw, reciprocating, and diesel-driven systems.
Where do you want to start?
Choose by compressor type, or start with system-level problems that apply to any unit.
General System Problems
System-level issues independent of compressor type — oil and water in air, low pressure, pressure drop, high energy use.
View general troubleshooting
Rotary Screw Compressors
Common issues: won't start, low pressure, pressure drop, overheating, oil carryover, high energy use.
View rotary screw troubleshooting
Reciprocating (Piston) Compressors
Solve problems like low output, slow pressure build-up, overheating, and excessive noise or vibration.
View reciprocating troubleshooting
Portable Diesel Compressors
Troubleshoot fuel system issues, low pressure, air-end failures, and derating under tough site conditions.
View diesel troubleshootingOr jump straight to a problem
If you already know the symptom, these are the issues you'll see most often across types.
Compressor won't start Rotary Screw
Check power supply, control voltage, safety circuits, and starter components.
Not building pressure Reciprocating
Valve wear, air blowing out inlet, gasket leaks, or ring wear reducing compression.
Engine won't start Diesel Portable
Battery, fuel system, glow plugs, starter motor, or safety interlock issues.
Overheating / high temperature shutdown Rotary Screw
Cooling system faults, dirty coolers, high ambient temperature, or low oil level.
Oil in compressed air General
Separator element failure, scavenge line blockage, or incorrect oil type/level.
Water in compressed air General
Infrequent tank draining, failed auto drains, or no point-of-use filtration.
Won't load / not building pressure Diesel Portable
Intake valve not opening, control air issues, or regulating valve failure.
Overload relay trips Reciprocating
Voltage issues, mechanical binding, starting against pressure, or capacitor failure.
High energy consumption General
Control mode issues, air leaks, pressure settings, and system design problems.
The Complete Guide to Diagnosing and Fixing Rotary Screw Air Compressor Problems
Save time, reduce downtime, and fix issues right the first time — with proven troubleshooting methods used across thousands of service calls.
- Step-by-step diagnostics for common rotary screw failures
- Root cause analysis techniques used by senior technicians
- Practical fixes with parts notes and time estimates
- Methods that work across all major rotary screw brands
- Checklists to help minimize unscheduled production downtime
Need Help Troubleshooting?
If you're responsible for keeping compressors running, this guide gives you a complete field-tested framework to diagnose and fix problems faster.
Get the Guide — $119 See What's InsideNeed Help With a Specific Problem?
If you're stuck on a tricky fault, you can submit your question to the Q&A section. It's the largest independent Q&A archive for industrial compressed air systems.