の調子が悪い

… is not working well; … is feeling unwell

→ の
phrase Uncommon #9,987
… is not working well; … is feeling unwell Used for things that are malfunctioning and for people who feel unwell. The word before の indicates what is in poor condition.
JA: パソコンの調子が悪い。
EN: The computer isn’t working well.

ブレーキの調子が悪い。

The brakes aren't working properly.

最近スマホの調子が悪い。

My smartphone has been acting up lately.

きっと機械の調子が悪いんですよ。

The machine must be malfunctioning.

テレビの調子が悪いんだよ。

The TV isn’t working properly.

どうも時計の調子が悪いんだ。

My watch seems to be acting up.

最近メールの調子が悪い。

My email has been acting up lately.

「どうしたの?」「スピーカーの調子が悪いんだ」

“What’s wrong?” “The speaker isn’t working right.”

車のエンジンの調子が悪いんだ。

There’s something wrong with the car’s engine.

どこかエンジンの調子が悪いに違いない。

There must be something wrong with the engine.

エアコンの調子が悪い。

The air conditioner isn’t working properly.