godan verb (-ru)
jingle; tinkle; whistle (kettle)
Describes a light, high-pitched ringing or whistling sound, often from small metal objects or a boiling kettle.
鈴がちんちん鳴る。
The bell jingles.
やかんがちんちん鳴っている。
The kettle is whistling.
A similar onomatopoeia for a light ringing, but ちんちん鳴る is a verb phrase while ちりんちりん is an adverb.
From the onomatopoeia ちんちん (a light ringing sound) combined with 鳴る (to sound).