Troubleshooting a Central-Air System
Troubleshooting a Central-Air System
Use these tips to diagnose problems with a central air conditioning system.
System Not Running
Causes: Incorrect thermostat setting; no power to unit.
Solutions: Be sure room temperature is above the thermostat setting. Check circuit breakers, main power switch.
System Runs but Doesn't Cool
Causes: May need refrigerant; airflow problem.
Solutions: Check for a clogged filter or malfunctioning blower. Look for blockages at the condensing unit. Refrigerant must be recharged by a professional.
System Cycles Too Often
Causes: May also indicate airflow problems; defective thermostat.
Solutions: Check condenser unit's airflow first, then the filter and blower. Check thermostat.
Uneven Cooling
Causes: If some rooms are too cool and others too warm, duct system needs balancing.
Solutions: To learn about balancing an air system, see Balancing a Forced-Air System, Related Projects. If house doesn't cool sufficiently, the unit may be undersized.
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