Original complaint
The system tripped its breaker after a replacement compressor was installed.
- Breaker tripped during startup after replacement
- Replacement compressor voltage did not match the application
Measurements taken
- Recorded pressure test
- 450 psi nitrogen; no leak found
- Recorded evacuation
- 350 microns
- Voltage ratings
- Mismatch identified; exact ratings not recorded in these notes
Diagnostic process
- 1Recovered refrigerant and removed the existing compressor
- 2Installed the replacement, pressure tested, evacuated, and returned recovered refrigerant
- 3Observed a breaker trip on attempted operation
- 4Reviewed the problem with technical supervision and identified a voltage mismatch
- 5Documented the need to return with the correct compressor
Finding / confirmed status
A compressor voltage mismatch was identified. The visit did not establish whether the installed compressor sustained permanent damage.
Repair / action taken
The replacement attempt did not restore service. A return visit with the correctly rated compressor was required.
Final operating readings
- Departure status
- Repair incomplete; correct compressor required
Technician notes
Compare the replacement nameplate with the actual supply and OEM part selection before installation. A breaker trip by itself does not prove a factory defect. The recorded test pressure and vacuum are job observations, not universal service targets.
- Verify voltage, phase, frequency, application, and approved part number before brazing
- Keep earlier suspected diagnoses separate from a later confirmed mismatch
Safety cautions
- De-energize and verify absence of voltage before electrical work
- Do not repeatedly reset a breaker into an unresolved fault
- Use OEM pressure limits and refrigerant procedures
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.