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LP intercooler pressure below
normal
Choked air filter elements. Remove and inspect air filter elements.
Clean or replace elements, if necessary.
Intercooler relief valve(s) leaking. Remove valve(s), clean and inspect.
Electric blow-off valve malfunctioning. Check interstage pressure. Check functioning of loading
solenoid valve. Replace diaphragm of blow-off valve if
necessary.
Air leak between LP and
HP compressor element. Inspect pipe connections and intercooler.
Replace leaking O-rings, gaskets or intercooler, if necessary.
LP compressor element not in order. Have LP compressor element inspected by Atlas Copco.
Intercooler clogged internally. Consult Atlas Copco.
LP intercooler pressure above
normal
Aftercooler clogged internally. Consult Atlas Copco.
HP compressor element not in order. Have HP compressor element inspected by Atlas Copco.
HP silencer and/or check valve give restriction. Check and take corrective action.
MP intercooler pressure below or
above normal
MP or HP element is failing. Consult Atlas Copco.
MP safety valve is leaking. Remove valve, clean and inspects parts.
Symptom Possible cause Corrective action
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