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6. General alarm lamp (H1) remains
alight for over 5 seconds after starting.
a. Insufficient engine oil pressure or too high engine coolant
temperature.
b. Engine oil pressure switch (S3), or compressor
temperature switch (S5) defective.
c. Relay (K5) and/or (K7) defective.
a. Stop at once, consult Engine Operation Manual.
b. Stop at once, test switches, replace as necessary.
c. Replace relay (K5) and/or (K7).
7. Hour meter (P1) does not count
running time.
a. Hour meter (P1) defective. a. Replace
8. Compressor does not unload and
engine keeps running at maximum
speed when closing the air outlet
valves; safety valve blows.
a. Air leaks in regulating system.
b. Regulating valve (RV) incorrectly set or defective.
c. Unloader valve (UV) or its actuating piston stuck.
a. Check and repair.
b. Consult Atlas Copco.
c. Repair unloader valve assembly.
9. Compressor capacity or pressure
below normal.
a. Air consumption exceeds capacity of compressor.
b. Choked air filter elements (AF).
c. Unloader valve (UV) not completely open.
d. Engine does not run at max. speed.
e. Oil separator element (OS) clogged.
a. Check equipment connected.
b. Replace air filter element (AF).
c. Check unloader valve; replace if necessary.
d. Check the maximum speed, service the fuel filter.
e. Have element removed and inspected by an Atlas Copco
Service representative.
10. Overheating; alarm lamp goes on. a. Insufficient compressor cooling.
b. Oil / coolant cooler clogged externally.
a. Relocate compressor.
b. Clean cooler; see section Cleaning coolers.
11. Engine keeps running at maximum
speed when closing the air outlet
valves; safety valve blows.
a. Consult authorized technician/Atlas Copco.
12. Working pressure rises during
operation and causes safety valve to
blow.
a. See faults 8.
b. Safety valve (SV) opens too soon.
a. See remedies 8.
b. Have safety valve adjusted; consult Atlas Copco.
Problem Possible faults Corrective actions
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