R-Pro › Field cases › Refrigeration systems
TXV Over-closure from Spring Over-tension or Bulb Gas Loss
Likely causes
Sensing bulb charge gas leak — opening signal lost
Check: Turn TXV adjustment screw counterclockwise 2 turns and check for change
What to do: Turn TXV adjustment screw counterclockwise 2 turns and check for change → If no change, suspect bulb gas loss → replace TXV → Replace filter drier at the same time → Measure superheat after replacement (target 5–8°C)
Adjustment spring over-tightened
Check: If no change, suspect bulb gas loss → replace TXV
What to do: If no change, suspect bulb gas loss → replace TXV → Replace filter drier at the same time → Measure superheat after replacement (target 5–8°C)
Diaphragm damaged
Check: Replace filter drier at the same time
What to do: Replace filter drier at the same time → Measure superheat after replacement (target 5–8°C)
TXV is continuously over-closed. Check for sensing bulb gas loss and replace TXV. Prolonged over-closure stops refrigerant supply, causing compressor motor cooling failure and burnout.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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