R-Pro › Field cases › Refrigeration systems
TXV Sensing Bulb Poor Contact
Likely causes
Clamp loosened
Check: Fix sensing bulb against suction line at 4 o'clock or 8 o'clock position
What to do: Fix sensing bulb against suction line at 4 o'clock or 8 o'clock position → Tighten clamp securely → Wrap bulb and contact area with insulating tape or foam to block ambient influence → Run for 20 minutes after fixing and confirm superheat stabilizes
Sensing bulb insulation (foam) missing or damaged
Check: Tighten clamp securely
What to do: Tighten clamp securely → Wrap bulb and contact area with insulating tape or foam to block ambient influence → Run for 20 minutes after fixing and confirm superheat stabilizes
Poor contact surface from pipe corrosion
Check: Wrap bulb and contact area with insulating tape or foam to block ambient influence
What to do: Wrap bulb and contact area with insulating tape or foam to block ambient influence → Run for 20 minutes after fixing and confirm superheat stabilizes
Poor sensing bulb contact causes incorrect temperature reading and unstable valve opening.
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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