Carrier 50HX Installation, Start-up, And Operating Instructions Manual

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Table 14—Troubleshooting ChartSYMPTOM CAUSE REMEDYCompressor and outdoor fanwill not startPower Failure Call power companyFuse blown or circuit breaker tripped Replace fuse or reset circuit breakerDefective thermostat, contactor, transformer,control relay, defrost board, or high pressure or loss-of-charge/low pressure switchReplace componentInsufficient line voltage Determine cause and correctIncorrect or faulty wiring Check wiring diagram and rewire correctlyThermostat setting too high Lower thermostat setting below roomtemperatureCompressor will not start but condenser fanrunsFaulty wiring or loose connections in compressorcircuit Check wiring and repair or replaceCompressor motor burned out, seized, orinternal overload openDetermine cause.Replace compressorDefective run capacitor, overload, or PTC(positive temperature coefficient) thermistor Determine cause and replaceLow input voltage (20 percent low) Determine cause and correctCompressor cycles (other than normallysatisfying thermostat)Refrigerant overcharge or undercharge Recover refrigerant, evacuate system, andrecharge to capacities shown on nameplateDefective compressor Replace and determine causeInsufficient line voltage Determine cause and correctBlocked outdoor coil Determine cause and correctDefective run/start capacitor, overload or startrelay Determine cause and replaceDefective thermostat Replace thermostatFaulty outdoor-fan motor or capacitor ReplaceDamaged reversing valve Determine cause and correctRestriction in refrigerant system Locate restriction and removeCompressor operates continuouslyDirty air filter Replace filterUnit undersized for load Decrease load or increase unit sizeThermostat set too low Reset thermostatLow refrigerant charge Locate leak, repair, and rechargeFrosted coil with incorrect defrost operationCheck defrost time settingsReset as necessaryCheck defrost temperature switchReplace as necessaryAir in system Recover refrigerant, evacuate system,and rechargeOutdoor coil dirty or restricted Clean coil or remove restrictionExcessive head pressureDirty air filter Replace filterDirty indoor or outdoor coil Clean coilRefrigerant overcharged Recover excess refrigerantAir in system Recover refrigerant, evacuate system,and recharge(Heat) Indoor air restricted or recirculating Determine cause and correctIndoor or outdoor air restricted or air short-cycling Determine cause and correct(Continued next page)34

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