13-18-601 Page 69
SYMPTOM POSSIBLE
CAUSE
REMEDY
Compressor
does not
unload (or
load)
1.
Improperly adjusted controller
1.
Refer to Manual 13-17-600 and adjust
control.
2.
Feed pressure regulator not
adjusted
2.
Inspect, adjust and replace pressure
regulator.
3.
Feed 3-way solenoid valve
malfunction
3.
Repair, clean or replace valve.
4.
Inlet valve stuck
4.
Inspect and replace valve.
5.
Blow down valve malfunction
5.
Repair, clean or replace valve.
Compressor
cycles from
load to unload
excessively
1.
Insufficient receiver capacity
1.
Increase receiver size
2.
Restriction in service piping
2.
Inspect and clean service piping.
3.
Restriction in control tubing
3.
Inspect and clean control tubing.
Compressor
starts too
slowly
1.
Acceleration time in VFD set too
long
1.
Contact your Gardner Denver
distributor.
2.
Minimum Pressure/Check Valve
is leaking
2.
Repair or replace.
Compressor is
low on delivery
and pressure
1,
Improperly adjusted control
1.
Refer to Manual 13-17-600 and adjust
control.
2.
Restricted air filter
2.
Clean or replace filter element.
3.
Inlet valve not fully open
3.
Inspect, adjust or replace feed solenoid
valve and/or pressure regulator.
4.
Minimum pressure valve stuck
closed
4.
Inspect, service or replace valve.
5.
Blowdown valve leaking
5.
Inspect or replace solenoid valve.
Ensure local ambient temperature has
not exceeded 113
°
F. limit.
6.
Air demand exceeds supply
6.
Make sure air demand matches
compressor specifications for flow and
pressure.
