Compressor Will Not Start
Other Other 5sel 180 300
Compressor Will Not Start
This diagnostic sequence determines the root cause when the refrigeration unit's compressor fails to cycle on when the internal temperature dictates it should be running.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
- Compressor hums loudly and continuously without starting: Unplug immediately. Locked rotor condition can overheat compressor. Requires manufacturer-or-licensed technician.
- Oil leak visible around compressor or fittings: Refrigerant leak suspected. Do not operate. Requires manufacturer-or-licensed technician for sealed system repair.
- Compressor runs but cabinet temperature continues to rise: Possible sealed system issue such as low charge or restriction. Requires manufacturer-or-licensed technician.
- Due to the involvement of live-voltage and refrigeration components, a qualified technician must diagnose the compressor issue to ensure safe and accurate repair.
Checklist
Guided Diagnostic Steps
Work from low-risk checks toward technician-level inspection only when evidence supports it.
You can read or print the route now. The first checkbox click opens the service contact gate.
- 1
Confirm the cabinet temperature is above the setpoint, indicating coo...
operator-intermediatelive-voltageConfirm the cabinet temperature is above the setpoint, indicating cooling is required.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
Stop conditions- Due to the involvement of live-voltage and refrigeration components, a qualified technician must diagnose the compressor issue to ensure safe and accurate repair.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 2
Visually inspect the compressor area for any obvious signs of leaks o...
operator-intermediatelive-voltageVisually inspect the compressor area for any obvious signs of leaks or damage.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
Stop conditions- Due to the involvement of live-voltage and refrigeration components, a qualified technician must diagnose the compressor issue to ensure safe and accurate repair.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 3
Listen for the relay clicking when the unit calls for cooling.
operator-intermediatelive-voltageListen for the relay clicking when the unit calls for cooling.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
Stop conditions- Due to the involvement of live-voltage and refrigeration components, a qualified technician must diagnose the compressor issue to ensure safe and accurate repair.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 4
Check the temperature sensor reading against the machine's programmed...
operator-intermediatelive-voltageCheck the temperature sensor reading against the machine's programmed setpoint.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
Stop conditions- Due to the involvement of live-voltage and refrigeration components, a qualified technician must diagnose the compressor issue to ensure safe and accurate repair.
Expected: Result is documented before continuing the route.
Evidence to note: note
Tools for this route
Parts status
Exact public parts list not verified yet. Use this route to identify the system before ordering.
Candidate areas for part verification
Other Possible Issues
Switch routes if this symptom is not the closest match.