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3. Temperature alarm lamp (H1) does not
light up when switching (S1) to ”I”
and applying lamp test.
a. Lamp (H1) blown.
b. See fault 1d.
a. Replace lamp.
b. See 1d.
4. Starter motor (S) does not crank
engine (E) after switching startbutton
(S1) to ” ”.
a. Low battery output. a. See remedy 1a.
5. Starter motor cranks engine when
switching start switch (S1) to ” ”,
but engine does not fire.
a. Contact switch (S1) defective.
b. Fuel solenoid (Y1) defective.
c. Low battery output.
a. See remedy 1d.
b. Check solenoid and its valve, correct or replace if
necessary.
c. See 1a.
6. Engine fires, but general alarm lamp
(H2) remains alight; engine stops
when releasing start switch (S1).
a. Alternator drive belt broken or slipping.
b. Alternator (A)/regulator defective.
a. Check and correct if necessary.
b. Have assembly repaired.
7. Engine is running, but shuts down
immediately after (S1) has been
released.
a. Contact switch (S1) released too soon.
b. Insufficient engine oil pressure.
c. Fuel tank contains insufficient fuel.
a. Release switch after engine oil pressure has built up
above the minimum allowed value.
b. Stop at once, consult the Engine Operation Manual.
c. Fill fuel tank.
8. General alarm lamp (H2) remains
alight for over 5 seconds after starting.
a. Insufficient engine oil pressure or too high engine oil
temperature.
b. Engine oil pressure switch (S3), or compressor
temperature switch (S5) defective.
c. Relay (K1) defective.
a. Stop at once, consult Engine Operation Manual.
b. Stop at once, test switches, replace as necessary.
c. Replace (K1).
9. Hourmeter (P1) does not count
running time.
a. Hourmeter (P1) defective. a. Replace.
10. 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. Unloading valve (UV) or its actuating piston stuck.
a. Check and repair.
b. Contact Atlas Copco.
c. Repair unloading valve assembly.
Problem Possible faults Corrective actions
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