Cooling fan
Common VFD, drive, UPS, and cabinet overheating failure point.
Gardner Denver Compressor Fault Codes — Quick Reference
Gardner Denver compressors use controller alarms covering temperature, pressure, motor protection, and service intervals. Model families vary, but high-temp and sensor-related trips are the most common field issues.
| Alarm | Meaning | Quick Fix |
|---|---|---|
| High Discharge Temp | Compressor overheating | Clean coolers; verify fan airflow |
| Low Oil Pressure | Lubrication fault | Check oil level and filters |
| Motor Overload | Current too high | Check amperage and load |
| Sensor Failure | Temperature or pressure sensor fault | Test or replace sensor |
| Separator Alarm | Restriction across separator | Replace separator element |
| Emergency Stop | E-stop input active | Reset and inspect circuit |
| Service Due | Maintenance interval reached | Perform PM |
| Phase Loss | Missing input phase | Check incoming power |
Most Common Faults
High Discharge Temperature
Dirty coolers, high ambient temperature, and low oil level top the list. Gardner Denver units in dusty shops often need much more aggressive cooler cleaning than the calendar PM schedule suggests.
Low Oil Pressure
Check the obvious first: oil level, oil filter condition, and whether the machine was just serviced with the correct lubricant. Wrong oil viscosity can trigger both pressure and temperature problems.
Separator Alarm
A high differential across the separator often shows up as reduced efficiency before a shutdown. If the separator is near PM interval anyway, replace it rather than trying to stretch service.
Parts Often Needed
| Part | Notes |
|---|---|
| Oil separator | Standard PM replacement |
| Temp / pressure sensor | Common controller alarm source |
| Oil filter | Replace with service kits |
| Fan motor / belt | Check cooling system on overheats |
Need Replacement Parts?
Before ordering, match the commercial equipment part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Pro
If the unit continues to trip after basic PM and cooler cleaning, have a compressor specialist inspect the thermostatic valve, inlet valve, and airend condition.