IR P185 & XP175 Troubleshooting: Compressor Won't Start or Run

ingersoll rand 185Greg Aiken
IR P185 & XP175 Troubleshooting: Compressor Won't Start or Run

Why Won’t My Ingersoll Rand 185 Portable Air Compressor Start or Run?

Troubleshooting Tips to Get You Up and Running

Nothing’s more frustrating than a compressor that refuses to start when you need it most. If your Ingersoll Rand 185 portable air compressor won’t start or run, don’t panic. This guide covers common issues and solutions for models P185A-SJD, P185A-WJD, XP175A-SJD, and XP175A-WJD—so you can troubleshoot the problem and get back to work, no service call required.

Common Causes of Starting Issues (And How to Fix Them)

1. Out of Fuel

  • Fix: Add clean diesel fuel and try starting the unit again.

2. Clogged Fuel Filters

  • Fix: Buy and install a new fuel filter to restore fuel flow.

3. Low Compressor Oil Level

  • Fix: Check the oil sight glass and add oil if needed.

4. Loose Wire Connection

  • Fix: Replace or repair the loose electrical connection.

5. Low Battery Voltage

  • Fix: Check the electrolyte level and battery connections.

6. <10 Volts at Shutdown Solenoid

  • Fix: Charge the battery and alternator. Make necessary repairs.

7. Defective Alternator

  • Fix: Repair or replace the alternator.

8. Out of Fuel (Again)

  • Fix: Add clean diesel fuel.

9. Engine Water Temperature Too High

  • Fix: Check the coolant level and add if necessary.

10. Malfunctioning Start Switch

  • Fix: Replace the start switch.

11. Defective D2 Diode

  • Fix: Replace the D2 diode.

12. Blown Fuse

  • Fix: Replace the fuse and check for shorts.

13. Engine Oil Pressure Too Low

  • Fix: Diagnose and resolve the low oil pressure issue.

14. Compressor Oil Temperature Too High

  • Fix: Inspect cooling components and oil levels.

15. Defective Discharge Air Temperature Switch

  • Fix: Replace the discharge air temp switch.

16. Defective Engine Oil Pressure Switch

  • Fix: Replace the engine oil pressure switch.

17. Defective Shutdown Solenoid

  • Fix: Replace the shutdown solenoid.

18. Defective Engine Temperature Switch

  • Fix: Replace the engine temp switch.

19. Defective Separator Tank Temperature Switch

  • Fix: Replace the separator tank temp switch.

20. Defective Low Fuel Shutdown Switch

  • Fix: Replace the low fuel shutdown switch.

21. Malfunctioning Relay

  • Fix: Replace the relay.

22. Engine Malfunction

  • Fix: Consult the engine troubleshooting guide.

23. Airend Malfunction

  • Fix: Seek professional service for airend troubleshooting.

👉 Check out the other posts in our IR 185 troubleshooting series, where we cover:

  • Unit is Shut Down and Won't Turn On
  • Unit Won't Shut Down
  • Won't Start/Run
  • Engine Temperature Lamp Staying On
  • Engine Temperature Lamp Staying Off
  • Engine Oil Pressure Lamp Staying On
  • Engine Oil Pressure Lamp Staying Off
  • Alternator Lamp Staying On
  • Alternator Lamp Staying Off
  • Excessive Temperature of Compressor Oil
  • Engine RPM Down
  • Too Much Vibration
  • Low CFM
  • Short Air Filter Life
  • Too Much Oil in Air
  • Oil in Air Filter
  • Oil Seal Leak
  • Will Not Unload
  • Safety Valve Issues

Disclaimer: The information provided in this blog is intended for general troubleshooting guidance only and may not cover every situation or machine configuration. Always refer to your specific equipment’s manual and follow the manufacturer’s safety instructions. If you are unsure or uncomfortable performing any maintenance or repairs, consult a qualified technician. Air Compressor Services is not responsible for any injuries, damages, or losses resulting from the use of this information.