HOU APCH CTLR WORKING A VERY BUSY SESSION DURING A CONFIGN CHANGE DUE TO LOW CEILINGS AND TSTM WX WAS CONCERNED THE SUPVR WAS NOT RUNNING 3 FINALS INSTEAD OF 2.

Narrative

THIS SEQUENCE OCCURRED DURING ONE OF THE BUSIEST ARR RUSHES OF THE DAY; DURING LOW CEILINGS; AND A TSTM STARTING TO INFRINGE ONTO THE FINAL APCH COURSE. DUAL SIMULTANEOUS APCHS WERE IN USE; WITH THE CAPABILITY OF TRIPLE SIMULTANEOUS APCHS; WHICH; THE SUPVRS CHOSE NOT TO USE. I WAS WORKING ONE OF THE FINAL POS (FN -- FINAL N CTLR); WHEN A SUPVR DECIDED TO CHANGE RWYS; BUT STAY IN DUAL SIMULATORS; WITH ONLY 2 MONITORS. I EXPRESSED MY CONCERN TO HIM ABOUT THE LEGALITY OF THIS; NONETHELESS; I WAS INSTRUCTED TO DO IT. THE OTHER FINAL CTLR (FC -- FINAL CTR CTLR) STARTED TRANSITIONING TO THE MOST S FINAL; RWY 27. I WAS TOLD; BY THE SUPVR; WHICH ACFT WOULD BE THE FIRST ON TO PUT ON THE CTR FINAL (RWY 26L); NOW BEING VACATED BY FC. THIS IS NOT LEGAL DUE TO THE FACT THERE WASN'T A THIRD FINAL MONITOR DURING THE TRANSITION. IT NOW TURNS OUT THAT THE OVERRIDE CAPABILITY OF ONE OF THE MONITORS WASN'T WORKING; SO WE WERE RUNNING SIMULTANEOUS ARRS; WITHOUT MONITORS. IN ADDITION; NUMEROUS ACFT ON MY FINAL WERE DEVIATING OFF THE FINAL APCH COURSE; TO THE R; AND RETURNING WITHOUT BEING SEPARATED FROM OTHER ACFT ALREADY ESTABLISHED ON THE OTHER FINAL APCH COURSE; IE; LOSS OF SEPARATION. THIS INFO WAS GIVEN TO THE SUPVRS ON DUTY; AS WELL AS THEIR SUPVR; WHO IS COVERING THIS UP.