故障原因：電源插頭鬆脫、插座損壞、內部保險絲燒斷、主板供電模塊燒毀、電源變壓器故障。
自查方法：換其他電器測插座、重插電源；若仍無反應多為內部電路零件損壞，需維修更換保險絲 / 主板。

Fault Cause: Loose plug, broken socket, blown fuse, damaged mainboard power module, faulty transformer.
Self Check: Test socket with other appliance, re-plug power. No response means internal circuit damage, fuse/mainboard replacement required.

故障原因：啟動電容老化、壓縮機過熱保護、溫控探頭故障、主板未發送製冷信號。
自查方法：關機靜置 30 分鐘重開；溫度調至最低測試；無改善需更換啟動電容或溫度感應器。

Fault Cause: Aged start capacitor, compressor overheat protection, faulty temperature sensor, no cooling signal from mainboard.
Self Check: Power off & rest 30 mins, set temp to lowest. Replace capacitor or sensor if no improvement.

故障原因：冷凝器積滿灰塵散熱不良、門封膠條漏冷、雪種（冷媒）輕微洩漏、風扇停轉。
自查方法：清理機身背部灰塵；關門後夾紙測膠條密封性；紙輕易抽出代表膠條老化。

Fault Cause: Dust clogged condenser, leaky door seal, minor refrigerant leak, fan stop running.
Self Check: Clean rear condenser dust, test seal with paper slip; slip pulls out easily = aged seal.

貼入原文第4至20項完整故障、原因、自查步驟

Paste full fault, cause & self-check text for No.4-20