Compressor starts but does not load
Atlas Copco MAS GA 18, oil-filled screw compressor
Possible cause
Faulty solenoid valve / stuck intake valve / leak in control lines / non‑sealing minimum‑pressure valve
What to do
Manufacturer's manual, p. 92Replace solenoid valve, inspect intake valve and minimum‑pressure valve, replace leaking lines
See the assembly on the 3D model
Other Atlas Copco MAS GA 18 faults
Compressor does not unload, safety valve tripsFaulty solenoid valve or intake valve does not closeCondensate does not drain under loadDrain line cloggedPerformance or pressure below normalFlow exceeds capacity, air filter clogged, solenoid valve faulty, leaks, intake valve not fully open, safety valve chokedElevated oil consumption, oil carried into the lineIncorrect oil (foaming), over‑filling, oil separator faulty, oil return line defectiveSafety valve trips after loadFaulty intake valve, minimum‑pressure valve or safety valve itself; oil separator cloggedHigh temperature at block outlet or air outletLow oil, insufficient cooling air, oil or air cooler clogged, bypass (thermostatic) valve faultyCompressor does not start, engine overload displayed on screenIncorrect phase sequence
From the manufacturer's manual “MAS18P-100 APB 440-460V 60 FM - ITJ396636 - Instruction Book”. Check against the original on board before work.
This page was translated automatically from the manual summary. Part numbers, codes and page numbers are as in the original.