Carrier 50DU INFINITY 14 Installation Instructions Manual

Table8--TroubleshootingChartSYMPTOMCompressor and outdoor fanwill not etartCompressor will not etart but condenser fanrunsCompressor cycles (other than normally eat-isfying) cooling/heating callsCompressor operates continuouslyExceseive head pressureHead pressure too lowExcessive suction pressureSuction pressure too lowIFM does sot runIFM operation is intermittentCAUSEPower failureFuse blown or circuit breaker trippedDefective contactor, transformer, control relay, or high-pressure, loss-of-charge or low-pressure switchInsufficient line voltageIncorrect or fruity wiringUI setting too low/too highFaulty wiring or circuitLoose connections in compressorCompressor motor burned oat, seized, orinternal overload openDefective run capacitor, overload, or PTC (positivetemperature coefficient) thermistorLow input voltage (20 percent low)Refrigerant overcharge or underchargeDefective compressorInsufficient line voltageBlocked outdoor coilDefective run/start capacitor, overload or start relayFaulty outdoor fan motor or capacitorRestriction in refrigerant systemDirty air filterUnit undersized for loadUI temperature set too lowLow refrigerant chargeAir in systemOutdoor coil dirty or restrictedDirty air filterDirty indoor or outdoor coilRefrigerant overchargedAir in systemIndoor or outdoor air restricted or air short-cyclingLow refrigerant chargeRestriction in liquid tubeHigh heat loadReversing valve hung up or leaking internallyRefrigerant overchargedDirty air filterLow refrigerant chargeMetering device or low side restrictedInsufficient coil airflowTemperature too low in conditioned areaOutdoor ambient below 55°PFilter drier restrictedBlower wheel not secured to shaftInsufficient voltage at motorPower connectors not properly sealedWater dripping into motorConnectors not firmly sealedREMEDYCall power companyReplace fuse or reset circuit breakerReplace componentDetermine cause and correctCheck wiring diagram and rewire correctlyReset UI settingCheck wiring and repair or replaceDetermine causeReplace compressorDetermine cause and replaceDetermine cause and correctRecover refrigerant, evacuate system, and re-charge to capacities shown on rating plateReplace and determine causeDetermine cause and correctDetermine cause and correctDetermine cause and replaceReplaceLocate restriction and removeReplace filterDecrease load or increase unit sizeReset UI settingLocate leak, repair, and rechargeRecover refrigerant, evacuate system, and re-chargeClean coil or remove restrictionReplace filterClean coilRecover excess refrigerantRecover refrigerant, evacuate system, and re-chargeDetermine cause and correctCheck for leaks, repair and rechargeRemove restrictionCheck for source and eliminateReplace valveRecover excess refrigerantReplace filterCheck for leaks, repair and rechargeRemove source of restrictionCheck filter replace if necessaryReset UI settingVerify low-ambient cooling enabled in UIReplaceProperly tighten blower wheel to shaftDetermine cause and correctConnectors should snap easily; do not forceVerify proper drip loops in connector wiresGently pull wires individually to be sure they arecrimped into the housing2d

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