T-349 6–26.3 UNIT RUNS BUT HAS INSUFFICIENT COOLINGCompressor Compressor valves defective 7.8Refrigeration SystemAbnormal pressures 6.7Controller malfunction 6.9Evaporator fan or motor defective 7.16Suction modulation valve malfunction 7.19Condenser Pressure Transducer defective CheckShortage of refrigerant 7.7.16.4 UNIT WILL NOT HEAT OR HAS INSUFFICIENT HEATINGNo operation of any kindStart-Stop switch OFF or defective CheckCircuit breaker OFF or defective CheckExternal power source OFF Turn ONNo control powerCircuit breaker or fuse defective ReplaceControl Transformer defective ReplaceEvaporator fan internal motor protector open 7.16Heat relay defective CheckHeater termination switch open 7.15Unit will not heat orhas insufficient heatHeater(s) defective 7.15Heater contactor or coil defective ReplaceEvaporator fan motor(s) defective or rotating backwards 7.15/7.16Evaporator fan motor contactor defective ReplaceController malfunction 6.9Defective wiring ReplaceLoose terminal connections TightenLow line voltage 3.36.5 UNIT WILL NOT TERMINATE HEATINGUnit fails to stop heatingController improperly set ResetController malfunction 6.9Heater termination thermostat remains closed along with theheat relay 7.156.6 UNIT WILL NOT DEFROST PROPERLYWill not initiatedefrost automaticallyDefrost timer malfunction (Cd27) Table 4–5Loose terminal connections Tighten/Defective wiring ReplaceDefrost temperature sensor defective or heat terminationthermostat open ReplaceHeater contactor or coil defective ReplaceCONDITION POSSIBLE CAUSEREMEDY/REFERENCESECTION
