Carrier Performance 50VR-A Installation Instructions Manual

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36Table 12 – Troubleshooting ChartSYMPTOM CAUSE REMEDYCompressor and outdoor fan will not startPower failure Call power companyFuse blown or circuit breaker tripped Replace fuse or reset circuit breakerDefective contactor, transformer or high--pressure,loss--of--charge or low--pressure switch Replace componentInsufficient line voltage Determine cause and correctIncorrect or faulty wiring Check wiring diagram and rewire correctlyThermostat setting too high Lower thermostat setting below room temperat-ureCompressor will not start but condenser fanrunsFaulty wiring or loose connections in compressor cir-cuit Check wiring and repair or replaceCompressor motor burned out, seized, or internal over-load openDetermine causeReplace compressorDefective run/start capacitor, overload, start relay Determine cause and replaceThree--phase scroll compressor (size 30--60unit) has a low pressure differential Scroll compressor is rotating in the wrong direction Correct the direction of rotation by reversing the3--phase power leads to the unitCompressor cycles (other than normallysatisfying thermostat)Refrigerant overcharge or undercharge Recover refrigerant, evacuate system, and re-charge to capacities shown on rating plateDefective compressor Replace and determine causeInsufficient line voltage Determine cause and correctBlocked condenser Determine cause and correctDefective run/start capacitor, overload or start relay Determine cause and replaceDefective thermostat Replace thermostatFaulty condenser--fan motor or capacitor ReplaceRestriction 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 rechargeMechanical damage in compressor Replace compressorAir in system Recover refrigerant, evacuate system, and re-chargeCondenser 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 re-chargeHead pressure too lowLow refrigerant charge Check for leaks, repair and rechargeCompressor IPR leaking Replace compressorRestriction in liquid tube Remove restrictionExcessive suction pressureHigh heat load Check for source and eliminateCompressor IPR leaking Replace compressorRefrigerant overcharged Recover excess refrigerantSuction pressure too lowDirty air filter Replace filterLow refrigerant charge Check for leaks, repair and rechargeMetering device or low side restricted Remove source of restrictionInsufficient evaporator airflow Increase air quantityCheck filter–replace if necessaryTemperature too low in conditioned area Reset thermostatOutdoor ambient below 55F (12.7C) Install low--ambient kitFilter drier restricted Replace filter50VR

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