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Engine running but compressor
does not load when ‘Load’ button is
pressed
Loading solenoid valve inoperative. Check loading solenoid valve and electric wiring. Replace
valve, if necessary.
Diaphragm of unloader piston perforated or throttle valve
remains closed for some reason.
Remove unloader piston cover and inspect rolling diaphragm.
If in order, check piston for free axial movement by hand. If
jammed, remove throttle valve housing, dismantle and replace
defective parts.
Control panel ‘Load’ button inoperative. Consult Atlas Copco.
Compressor oil pressure too low Compressor oil level too low. Before checking compressor oil level, wait approx. 10 minutes
after unit has stopped.
Add correct oil, if necessary. Never overfill.
Compressor oil filter clogged. Replace compressor oil filter.
Bypass valve in oil pump stuck in open position. Remove bypass valve, clean and inspect.
Oil pump failure. Remove oil pump and inspect parts for wear.
Bypass valve of oil sump stuck in open position. Remove bypass valve, clean and inspect.
Ambient temperature too low. Use heaters, check oil viscosity.
Compressor oil pressure sensor disconnected. Connect wiring.
Symptom Possible cause Corrective action
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