malfunction[verb]Synonyms:- break down, fail, go wrong
[noun]Synonyms:- fault, breakdown, defect, failure, flaw, glitch 
 [TahlilGaran] English Synonym Dictionary ▲
 mal‧func‧tion /mælˈfʌŋkʃ
ən/ 
 noun [countable] a fault in the way a machine or part of someone’s body works: 
 a malfunction in one of the enginesmalfunction of
 a malfunction in one of the enginesmalfunction of a malfunction of the immune system
 a malfunction of the immune system an equipment malfunction—malfunction verb [intransitive]
 an equipment malfunction—malfunction verb [intransitive]: 
 A warning light seems to have malfunctioned.
 A warning light seems to have malfunctioned.  [TahlilGaran] Dictionary of Contemporary English ▲