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WarningEvaporators & Cases

EEV / TXV Superheat Hunting

The metering valve oscillates instead of holding steady superheat, so suction pressure and case temperature swing and capacity suffers.

Symptoms
  • Suction pressure and superheat cycling up and down on a steady load
  • Case/box temperature swinging around setpoint
  • Audible refrigerant surging / gurgling at the coil
  • EEV controller showing superheat chasing the target
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Likely causes, step-by-step troubleshooting & safety notes

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Related faults
Low Refrigerant ChargeEvaporator Coil Icing / Frost Build-Up
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For qualified refrigeration technicians. Always follow manufacturer procedures and local codes. R-290 (propane) and other flammable refrigerants require A3-rated tools and safety practices.