ProblemThe AC system turns on unexpectedly without adjusting the thermostat. Possible CausesThermostat programming settingsFaulty thermostatElectrical control issueTemperature fluctuations How To Fix ItCheck thermostat schedule settingsReplace thermostat batteriesReset thermostat if possibleMonitor when the system turns on When To Call A ProfessionalIf the AC continues turning on unexpectedly, the thermostat or control board may need inspection.
ProblemThe AC system struggles to cool because the outdoor condenser coil is covered with dirt or debris. Possible CausesOutdoor dust and dirt buildupLeaves or debris around the unitLack of regular maintenanceRestricted airflow How To Fix ItTurn off power to the outdoor unitRemove debris from around the unitGently rinse coils with waterEnsure proper airflow around the…
ProblemThe AC system turns on but the indoor fan does not blow air through the vents. Possible CausesBlower motor failureFaulty capacitorClogged air filterElectrical issue How To Fix ItReplace the air filterCheck thermostat fan settingsInspect breaker panelRestart the HVAC system When To Call A ProfessionalIf the indoor fan does not run, the blower motor or capacitor…
ProblemThe indoor air handler does not start even though the thermostat is set to cool. Possible CausesTripped breakerThermostat malfunctionBlower motor failureElectrical issue How To Fix ItCheck the breaker panelConfirm thermostat settingsInspect the air filter for blockageRestart the system after checking power When To Call A ProfessionalIf the air handler still does not start, an HVAC…
ProblemA loud screeching sound comes from the AC unit when it starts or runs. Possible CausesWorn fan motor bearingsLoose fan beltDebris inside the fanMotor failure How To Fix ItTurn off the AC systemInspect the outdoor fan area for debrisCheck if the noise occurs during startupRestart the system briefly to confirm the sound When To Call…
ProblemAir blows strongly from vents but the air is not cold. Possible CausesLow refrigerantDirty evaporator coilThermostat malfunctionCompressor issue How To Fix ItReplace the air filterVerify thermostat is set to cooling modeCheck that the outdoor unit is runningAllow the system to run for several minutes to monitor temperature When To Call A ProfessionalIf strong airflow continues…
ProblemA hissing sound comes from the AC unit while it is running. Possible CausesRefrigerant leakHigh pressure in refrigerant linesAir escaping from ductworkLoose internal component How To Fix ItTurn off the AC and listen for where the sound comes fromInspect visible refrigerant linesCheck vents for airflow leaksRestart the system to confirm the sound When To Call…
ProblemThe AC system runs but cannot keep the house cool during hot weather. Possible CausesDirty air filterLow refrigerantDirty condenser coilsUndersized AC unit How To Fix ItReplace the air filterCheck that outdoor unit coils are cleanClose doors and windows to keep cool air insideSet thermostat to a reasonable temperature When To Call A ProfessionalIf the AC…
ProblemThe AC system runs continuously through the night without shutting off. Possible CausesThermostat set too lowDirty air filterHot outdoor temperaturesLow refrigerant How To Fix ItRaise the thermostat temperature slightlyReplace the air filterCheck vents for airflowMonitor cooling performance When To Call A ProfessionalIf the AC never shuts off even at moderate temperatures, a technician should inspect…
ProblemThe outdoor AC compressor produces a knocking sound while running. Possible CausesLoose internal compressor partsRefrigerant imbalanceCompressor wearDebris inside the unit How To Fix ItTurn off the AC systemInspect the outdoor unit for debrisCheck that the unit is levelRestart the system to monitor noise When To Call A ProfessionalA knocking compressor often indicates internal damage and…