What was found
ERRONEOUS TEMPERATURE READINGS ON ESC PAGE ON AIR DUCT FROM PACKS , UNABLE TO MAKE TEMPERATURE ADJUSTMENTS, STRANGE ALMOST BURNING SMELL THROUGHOUT FLIGHT DECK AND PASSENGER CABIN (FLIGHT 4294) DEFERRED BOTH PACK TEMP AUTO MODE PER CRJ 550 MEL 21-61-1C. VERIFIED BOTH MANUAL MODES WORK AND DUCT TEMP SENSORS OPERATE PROPERLY. NO ABNORMAL SMELLS NOTED WHILE RUNNING PACKS. PLACARDS INSTALLED, CABIN/COCKPIT AUTOMODE TEMPERATURE CONTROL SYSTEM OPS CHECKS GOOD PER AMM 21-61C-02, THIS CLEARS MEL 21-61-1C, PLACARDS REMOVED. FOR COCKPIT LOW AIR FLOW CORRECTIVE ACTION SEE EAML 1711751 FOR DETAILS.