The Collaborative International Dictionary of English v.0.48:

on the fritz \on` the fritz"\ ([o^]n` [th][u^] fr[i^]ts"), pred.
   a.
   Malfunctioning or inoperable; -- of machinery and devices.
   [slang]
   [PJC]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "on the fritz":
   amiss, askew, awry, broken, cockeyed, convulsed, deranged,
   disarranged, discomfited, discomposed, disconcerted, dislocated,
   disordered, disorderly, disorganized, disturbed, haywire,
   in disorder, in disrepair, inoperative, misplaced, on the blink,
   out of commission, out of condition, out of gear, out of joint,
   out of kelter, out of kilter, out of order, out of place,
   out of repair, out of tune, out of whack, perturbed, roily,
   shuffled, turbid, turbulent, unsettled, upset