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Problem solving
It is assumed that the engine is in good condition and that there is adequate fuel flow to
the filter and injection equipment.
Problem: Compressor capacity or pressure below normal.
Make sure that the wires are not damaged and that they are clamped tight to their
terminals.
For denomination of switches, relays, etc., see .
See also section Control panel.
Problem: Pressure in air receiver rises above maximum and causes safety valve to blow.
An electrical fault must be traced by an
electrician.
Possible faults Corrective actions
Air consumption exceeds capacity of compressor. Check equipment connected.
Choked air filter elements (AF). Remove and inspect elements. Clean or replace, if necessary.
Regulating valve (RV) defective. Have regulating valve removed and inspected by an Atlas copco Service representative.
Blow down valve stuck in open position. Check and correct as necessary.
Loading valve (LV) leaking past O-ring. With compressor running at max. load speed, disconnect hose leading to unloader. If air leaks from the hose,
remove and inspect loading valve. Replace damaged or worn O-rings.
Oil separator element clogged. Have element removed and inspected by an Atlas copco Service representative.
Air intake throttle valve remains partially closed. Check unloader and identify reason for open valve; if possible: solve; else: contact Atlas copco.
Safety valve (SV) leaking. Remove and inspect. Replace if not airtight after reinstallation.
Blow-off valve leaking. Remove and inspect. Replace if necessary.
Possible faults Corrective actions
Regulating valve (RV) opens too late or its ball valve spring is broken. Have regulating valve removed and inspected by an Atlas copco Service representative.
Air leaks in regulating system. Check hoses and their fittings. Stop leaks; replace leaking hoses.
Air intake throttle valve does not close for some reason. Check unloader and identify reason for open valve; if possible: solve; else: contact Atlas copco.
Minimum pressure valve malfunctioning. Remove and inspect valve.
Blow-off valve malfunctioning. Remove and inspect valve.
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