mal ‧ func ‧ tion /mælˈfʌŋkʃ ə n/ BrE AmE noun [countable]
a fault in the way a machine or part of someone’s body works:
a malfunction in one of the engines
malfunction of
a malfunction of the immune system
an equipment malfunction
—malfunction verb [intransitive] :
A warning light seems to have malfunctioned.