ICP PGN324 Installation Instructions Manual

Contents

26Table 9—Troubleshooting ChartSYMPTOM CAUSE REMEDYCompressor and condenser fan will notstart.Power failure Call power companyFuse blown or circuit breaker tripped Replace fuse or reset circuit breakerDefective contactor, transformer, or high--pres-sure, 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 temperature setting belowroom temperatureCompressor will not start but condenserfan runsFaulty wiring or loose connections in compressorcircuit Check wiring and repair or replaceCompressor motor burned out, seized, or Determine causeinternal overload open Replace compressorDefective run/start capacitor, overload, start relay Determine cause and replaceOne leg of 3--phase power dead Replace fuse or reset circuit breakerDetermine causeLow input voltage (20% low) Determine cause and correctCompressor cycles (other than normallysatisfying UI)Refrigerant overcharge or undercharge Recover refrigerant, evacuate system, andrecharge 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 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 ThermostatLow refrigerant charge Locate leak, repair, and rechargeAir in system Recover refrigerant, evacuate system, andrechargeOutdoor coil dirty or restricted Clean coil or remove restrictionExcessive head pressureDirty air filter Replace filterDirty condenser coil Clean coilRefrigerant overcharged Recover excess refrigerantAir in system Recover refrigerant, evacuate system, andrechargeCondenser air restricted or air short--cycling Determine cause and correctHead pressure too low Low refrigerant charge Check for leaks, repair, and recharge.Restriction in liquid tube Remove restrictionExcessive suction pressureHigh heat load Check for source and eliminateCompressor valves 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 filter

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