Q. Water drips immediately after turning off the air conditioner. Is it a malfunction?

Q. Water drips immediately after turning off the air conditioner. Is it a malfunction?
2026年08月29日 21時50分Level: N2Sentences: 18
エアコンスイッチ直後ちょくごくちからポタポタみずことあります

Immediately after switching off the air conditioner, water may fall from the outlet with a "drip, drip" sound.

はじめてときおどろしれませ停止ていし直後ちょくご少量しょうりょうみずれる現象げんしょうほとんど場合ばあいエアコン正常せいじょう動作どうさいる証拠しょうこです

You may be surprised when you see it for the first time, but the phenomenon of a small amount of water dripping right after stopping is, in most cases, evidence that the air conditioner is operating normally.

停止ていし直後ちょくごみずれる原因げんいん結露けつろです

The cause of water dripping right after stopping is "condensation."

エアコン内部ないぶのこ結露けつろすいファンまっこと排水はいすいそのままいるいうだけ機器きき不具合ふぐあいありませ

It is simply that the condensed water remaining inside the air conditioner is not drained because the fan has stopped, and it falls down as is; it is not a malfunction of the device.

エアコン冷房れいぼう除湿じょしつ運転うんてんいるあいだ室内しつない内部ないぶ熱交換器ねつこうかんき(アルミフィン)表面ひょうめん515°C程度ていどまでやさます

While the air conditioner is in cooling or dehumidifying operation, the surface of the heat exchanger (aluminum fins) inside the indoor unit is cooled to about 5 to 15°C.

室内しつないあたたかく湿しめ空気くうきこのつめたいフィンれる空気くうきちゅう水蒸気すいじょうき結露けつろすいわりこれよっ除湿じょしつおこなれるです

When the warm, humid indoor air comes into contact with these cold fins, the water vapor in the air turns into condensation, and this is how dehumidification is performed.

なお運転中うんてんちゅうドレンパン(熱交換器ねつこうかんきしたざら)まっ結露けつろすいドレンホースつう継続的けいぞくてき屋外おくがい排水はいすいます

During operation, the condensed water that collects in the drain pan (the tray placed under the heat exchanger) is continuously drained outside through the drain hose.

しかしエアコン運転うんてん停止ていしする送風そうふうファン同時どうじまります

However, when the air conditioner stops operating, the blower fan also stops at the same time.

その結果けっか熱交換器ねつこうかんきフィン周辺しゅうへん内壁ないへき付着ふちゃく結露けつろすいドレンホースながまえそのまましたしまういうわけです

As a result, the condensed water that had adhered to the heat exchanger, fins, and surrounding inner walls drips down as is before it can flow into the drain hose.

またくちのこ水滴すいてきちるケースあります

Also, there are cases where water droplets remaining in the outlet fall.

いずれ冷房れいぼう運転うんてん停止ていし23ふん以内いない自然しぜんおさまれ問題もんだいありませ

In either case, there is no problem if it naturally stops within 23 minutes after the cooling operation is stopped.

停止ていし直後ちょくご少量しょうりょうポタポタれるだけあれ問題もんだいないです以下いかようケース対処たいしょ必要ひつようなっます

If it only drips a small amount immediately after stopping, there is no problem, but in cases like the following, measures are necessary.

ドレンホースまりうたがます

A clogged drain hose is suspected.

ホース内部ないぶゴミむし堆積たいせきするドレンパンからみずあふれ室内しつないしまうこと

If dust, insects, or algae accumulate inside the hose, water may overflow from the drain pan and leak into the room.

市販しはんドレン洗浄せんじょうスプレー解消かいしょうできることおおそれ改善かいぜんなけれエアコンクリーニングぎょうしゃ依頼いらい検討けんとうましょう

This can often be resolved with a commercially available drain cleaning spray, and if it still does not improve, consider requesting an air conditioner cleaning service.

フィルター目詰めづまりよっ空気くうき正常せいじょう供給きょうきゅう熱交換器ねつこうかんきしも付着ふちゃくいる可能性かのうせいあります

There is a possibility that air is not supplied normally due to a clogged filter, causing the heat exchanger to cool too much and frost to form.

この場合ばあいしもとき大量たいりょうみずことあります

In this case, a large amount of water may come out when the frost melts.

フィルター清掃せいそううえそれみず再度さいど確認かくにんましょう

After cleaning the filter, check again to see if water still comes out.

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