Sencor
Compressor Not Starting
Unit powers on but compressor never starts; only fan runs and room does not cool.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed compressor, Faulty start/run capacitor (non-inverter), Faulty relay on main PCB, Low or high pressure protection active
How to Fix / Troubleshooting
Safety first: High voltage and pressurized refrigerant are present. Limit DIY to basic checks.
- Step 1 – Confirm mode: Ensure the unit is set to COOL and the set temperature is at least 3–5°C below room temperature.
- Step 2 – Listen for compressor: After a few minutes of operation, listen near the compressor area for a humming or vibration. Silence may indicate it is not being energized.
- Step 3 – Check airflow and filters: Clean filters and ensure good airflow; some models delay compressor start if airflow is poor.
- Step 4 – Capacitor inspection (if equipped): On portable units with a capacitor, inspect for bulging or leakage and replace with the same rating if defective.
- Step 5 – Professional diagnosis: If compressor still does not start, a technician should test compressor windings, relays, and pressure switches.
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Repair Difficulty
Hard
4/5
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