CO2 Oil Management / Return Fault

Oil (PAG/POE for CO2) fails to return or manage correctly across the booster rack, tripping oil safeties.

Symptoms

Oil-level or oil-differential safety tripping on MT/LT compressors
Low level in a crankcase or reservoir
Oil logging in the flash tank / evaporators

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Likely causes, step-by-step troubleshooting & safety notes

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