Carrier 50VL-A Performance Installation Instructions Manual

Also see for Performance 50VL-A: Owner's information manual Installation instructions Installation instructions Installation instructions

Contents

27Table 8 – 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, control relay, 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 low/too high Reset thermostat settingCompressor will not start but condenser fanrunsFaulty wiring or circuitLoose connections in compressor Check wiring and repair or replaceCompressor motor burned out, seized, or Determine causeinternal overload open Replace compressorDefective run capacitor, overload, or PTC (positivetemperature coefficient) thermistor Determine cause and replaceOne leg of 3--phase power dead Replace fuse or reset circuit breakerDetermine causeLow input voltage Determine cause and correctThree--phase scroll compressor (size 30-- Scroll compressor is rotating in the wrong direction Correct the direction of rotation by reversing the60 unit) has a low pressure differential 3--phase power leads to the unitCompressor cycles (other than normallysatisfying) cooling/heating callsRefrigerant 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 outdoor coil Determine cause and correctDefective run/start capacitor, overload or start relay Determine cause and replaceFaulty outdoor 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 temperature set too low Reset thermostat settingLow refrigerant charge Locate leak, repair, and rechargeAir in system Recover refrigerant, evacuate system, and re-chargeOutdoor 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-chargeIndoor or outdoor air restricted or air short--cycling Determine cause and correctHead pressure too low Low refrigerant charge Check for leaks, repair and rechargeRestriction in liquid tube Remove restrictionExcessive suction pressure Refrigerant 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 coil airflow Check filter–replace if necessaryTemperature too low in conditioned area Reset thermostat settingOutdoor ambient below 55°F (13°C) Install low--ambient kitFilter drier restricted Replace50VL-- A