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All answers having "Not working" as clue:

3 Character Answers:

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DUD

ILL

OFF

RHO



4 Character Answers:

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DEAD

DOWN

IDLE

INOP

NOGO

PEST



5 Character Answers:

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KAPUT



6 Character Answers:

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ABSENT

ATHOME

ATREST

BROKEN

FAULTY



7 Character Answers:

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LAIDOFF

OFFDUTY

ONBREAK

ONLEAVE

RETIRED



8 Character Answers:

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INACTIVE

ONABREAK

ONSTRIKE



10 Character Answers:

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INOPERABLE

ONTHEBLINK

ONTHEFRITZ

OUTOFORDER

OUTOFWHACK



11 Character Answers:

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INOPERATIVE



15 Character Answers:

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OUTOFCOMMISSION