Problem
A musty or mold smell comes from the vents when the AC runs.
Possible Causes
Mold in ductwork
Dirty evaporator coil
Clogged condensate drain
Excess moisture in the system
How To Fix It
Replace the air filter
Clean vent covers
Run the system fan to circulate air
Inspect drain line for clogs
When To Call A Professional
Persistent mold smells may require professional coil cleaning or duct inspection.
Problem Your AC unit is running and the fan is spinning, but the house is not cooling properly. Possible Causes Dirty air filter restricting airflowLow refrigerant levelsFrozen evaporator coilBlocked condenser unitThermostat issues How To Fix It Replace or clean the air filterCheck if the outdoor condenser is blockedEnsure the thermostat is set correctlyAllow frozen coils…
ProblemDust blows out of the vents when the AC system runs. Possible CausesDirty air filterDust inside ductworkDirty ventsClogged return air vent How To Fix ItReplace the air filterClean vent coversVacuum around ventsInspect return vents for dust buildup When To Call A ProfessionalIf dust continues blowing from vents, duct cleaning may be required.
ProblemThe outdoor condenser fan does not spin during operation. Possible CausesFaulty capacitorBurned motorElectrical problems How To Fix ItTurn off the unitCheck for debris blocking the fan When To Call A ProfessionalFan motor replacement requires HVAC repair.
ProblemThe AC system randomly shuts off and then starts working again. Possible CausesLoose electrical connectionThermostat malfunctionCircuit breaker issueFaulty capacitor How To Fix ItCheck the breaker panel for trippingInspect thermostat batteriesRestart the HVAC systemListen for unusual sounds from the outdoor unit When To Call A ProfessionalIf the system continues losing power, an HVAC technician should inspect…
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…
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.