Unit powers on but compressor never starts; only fan runs and no cooling occurs.

Safety first: Unplug the unit and wait several minutes before accessing electrical components.

• 1. Listen for compressor: When switching to COOL, listen for a distinct click and a deeper humming sound. If you only hear the fan, the compressor may not be starting.
• 2. Check mode and temperature: Ensure the set temperature is at least 2–3°C below room temperature and the mode is COOL, not FAN or DRY.
• 3. Inspect capacitor (advanced): Access the compressor compartment and locate the start/run capacitor. Look for bulging, leaking, or burnt smell. Replace with an identical microfarad (µF) rating if defective.
• 4. Relay and wiring: Check the compressor relay on the PCB and wiring to the compressor for loose or burnt connections.
• 5. Technician testing: If a new capacitor does not solve the issue, a technician should test compressor windings and current draw. A failed compressor usually requires professional replacement.