Condition Fault Remedy
Too high temperature in oil
separator vessel or temperature
switch (TSHH1) defective
Find cause and remedy. Replace
if necessary.
Motor thermistor (K34) tripped or
defective
Find cause and remedy. Replace
if necessary.
Phase sequence relay (K25) open Find cause and remedy. Replace
if necessary.
Wiring interrupted Find cause and remedy. Replace
if necessary.
Compressor starts running, but
does not load after a delay time
Solenoid valve out of order Replace valve
Inlet valve stuck in closed position Have valve checked
Leak in control air tubes Replace leaking tubes
Minimum pressure valve leaking
(when air net is depressurised)
Have valve checked
Compressor does not unload,
safety valve blows
Solenoid valve out of order Replace valve
Inlet valve does not close Have valve checked
Condensate is not discharged
from condensate separator during
loading
Discharge tube clogged Check and correct as necessary
Compressor air output or pressure
below normal
Air consumption exceeds air
delivery of compressor
Check the connected equipment.
Choked air filter element Replace filter element
Solenoid valve malfunctioning Replace valve
Oil separator element clogged Have element replaced
Air leakage Have leaks repaired. Replace
leaking tubes
Safety valve leaking Replace valve
Inlet valve does not fully open Have valve checked
Compressor element out of order Consult Atlas Copco
Excessive oil flow through air inlet
filter after stopping
Check valve leaking or oil stop valve
jammed
Replace defective parts. Replace
air filter element
Excessive oil consumption; oil
carry-over through discharge line
Incorrect oil causing foam Change to correct oil
Instruction book
156 2920 7109 51
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