Carrier 50BY Series - Troubleshooting Guide; Power Indicator and Overload Faults; Compressor Start-Up Failures; Airflow and Pressure Switch Trips

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Troubleshooting
SYMPTOMS PROBABLE CAUSE REMEDY
Power indicator light off Power switch off Turn switch on
Blower fuse Replace
Power indicator light on Fan belt broken Replace
Low line voltage Check and correct cause
Overload open Check and correct
Overload indication light on Fan belt broken Replace
Low line voltage Check and correct cause
Overload open Check and correct
Compressor will not run Overload open Check and correct cause
Pump motor off Start pump motor
Thermostat settings too hibht Set thermostat properly
Low line voltage Check and correct
Safety devices open Check cause and reset
Insufficient evaporator air Loose fan open Adjust belt tension
Air filter clogged Clean or replace
Pressure switches trip out frequently Improper condenser water flow or temp. Check and adjust water flow or temp.
Dirty condenser tubes or coil Clean condenser
Improper entering air temp. Check and adjust
Low refrigerant charge Add refrigerant
Ratting or squealing fan section Bearing broken Replace
Fan rubbing housing Fasten fan wheel to shaft
Foreign matter in fan housing Remove foreign matter
Loose or worn belt Adjust tension or replace
Noisy compressor Improper compressor mounting Adjust or loosen mounting bolts