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| Failure | Probability | Root Cause | Solution | | :--- | :--- | :--- | :--- | | | High | High pressure protection (dirty condenser coil or overcharge) | Clean outdoor coil. Reclaim, evacuate, recharge by weight. | | No cooling / frozen evaporator | Medium | Low refrigerant (leaky flare joint) | Leak check with electronic detector. Reflare and recharge. | | Sensor failure | Low | Indoor ambient thermistor drift | Replace thermistor (generic 10kΩ NTC works). | | Fan motor noise | Medium | Bearing wear in indoor cross-flow fan | Replace fan assembly or lubricate (if accessible). |