| Problem | Typical Cause | DIY Possible? | |---------|--------------|----------------| | Unit won't start | Capacitor failure | Yes (with caution) | | Low cooling | Gas (refrigerant) leak | No (requires certification) | | Water leakage | Clogged drain pipe | Yes | | Loud noise | Loose fan blade or bearing | Yes | | Error code E5 | Outdoor unit PCB communication | No | | Foul smell | Mold in evaporator coil | Yes | | High electricity bill | Dirty condenser coils | Yes |
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