Original complaint
System had an intermittent supply-sensor reading concern after the sensor had previously been replaced.
- System was cooling normally during the visit
- Sensor issue was intermittent and could not be reproduced consistently
- Refrigerant readings and temperature split did not support adding charge
Measurements taken
- Suction pressure
- ~125 psig
- Liquid pressure
- ~410 psig
- Supply air
- ~58°F
- Return air
- ~80°F
- Temperature split
- ~21°F
- Refrigerant added
- None
Diagnostic process
- 1Verified the current supply and return temperatures
- 2Recorded suction/liquid pressures under the present load
- 3Reviewed the history of the previously replaced supply sensor
- 4Because the system was performing normally, did not add refrigerant or change the sealed system
- 5Documented the intermittent nature of the sensor complaint for future observation
Finding / confirmed status
No active refrigeration fault was confirmed during the visit; the remaining concern was an intermittent sensor/control indication.
Repair / action taken
No refrigerant adjustment was made. System operation was documented and the intermittent sensor issue left for continued monitoring if it recurs.
Final operating readings
- Temperature split
- ~21°F
- Cooling status
- Normal during visit
- Refrigerant added
- 0 lb
Technician notes
Do not let an unrelated sensor complaint turn into unnecessary refrigerant work when the refrigeration pattern and air-side performance do not support it.
- Avoid adjusting charge just because gauges are connected
- Use the whole operating pattern and current complaint
- Intermittent sensor problems may require trend/history data rather than parts swapping
Safety cautions
- Use pressure-rated service tools when connecting gauges
- Avoid unnecessary refrigerant handling when the sealed system does not require service
Safety note
HVAC work can involve high voltage, rotating equipment, pressurized refrigerants, and combustion systems. Use this site as a reference only. Follow the equipment manual, applicable codes, PPE, lockout/tagout, and current refrigerant rules. Field cases and troubleshooting paths are case-specific and are not OEM procedures or universal targets.