Possible causes of refrigerant flood-back during compressor startup are:
• Oversized valve.
• TEV seat leak (off cycle).
• Low superheat adjustment.
• Wrong thermostatic charge.
• Bulb installation.
• Poor thermal contact.
• Warm location.
• Compressor discharge valve leak.
• Solenoid valve seat leak.
• Compressor in cold location.
• Suction line in cold location.
• Evaporator free draining to compressor.
• Interrupted pump down.
• Restricted or plugged external equalizer.
Source: Sporlan Valve Co.
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