Sullair 300HH, User Manual, Page: 74 / 80

300HH, 375, 375H, 375HH, 425 AND 425H USER MANUAL R00 SECTION 5
72
Compressor does not achieve full
discharge pressure Run/start switch not in run position For compressors with idle warm-up
controls, switch toggle to RUN for full
operation
Air demand is excessive Check service lines for leaks or open
valves
Dirty air filter Check the filter and change the
element if required
Defective pressure regulator Check the diaphragm and replace
with Kit if necessary
Defective idle warm-up control Replace control
Engine Warning/Shutdown lamp
flashing—engine is derating Turn the compressor OFF. Use
PowerView menu and arrow keys to
determine engine fault. Ignore the
SSAM Flash Code. See the Engine
Warning/Shutdown table for probable
cause
Improper unloading with an excessive
pressure build-up causing the
pressure relief valve to open Pressure regulating valve is set too
high Readjust
Control system leak causing loss of
pressure signal Check control lines
Defective pressure regulating valve.
Repair valve (kit available)
Inlet valve jammed Free or replace valve
Restriction in the control system Check all control lines and
components—ice and/or other
contaminants could be the cause
Defective pressure relief valve
opens when pressure is too low Replace the pressure relief valve
Defective pressure regulator Check the diaphragm and replace
with Kit if necessary
Insufficient air delivery Run/start switch not in run position For compressors with idle warm-up
controls, switch toggle to RUN for full
operation
Plugged air filter Replace
Defective idle warm-up control Replace control
Plugged air/fluid separator Replace separator element and also
change compressor fluid and fluid
filter
Defective pressure regulator Adjust or repair
Engine speed too low Readjust engine speed
Engine Warning/Shutdown lamp
flashing—engine is derating Turn the compressor OFF. Use
PowerView menu and arrow keys to
determine engine fault. Ignore the
SSAM Flash Code. See the Engine
Warning/Shutdown table for probable
cause
Excessive compressor fluid
consumption Clogged return line Clear orifice and return line strainer
Lubrication system leak Check all pipes, connections and
components
Separator element damaged or
malfunctioning Change separator element