Goodman Manufacturing Company provides a list of basic steps that might correct malfunctioning air conditioners on GoodmanMfg.com. Goodman recommends contacting a certified professional for any HVAC service required, due to the complexity of the machinery.
Improper settings can cause basic HVAC malfunctions and are easy to address. Goodman recommends checking thermostat settings first, ensuring that circuit breakers are on, confirming that the system switch is set to the appropriate selection between cool and heat, and disconnecting and reconnecting indoor and outdoor switches. Confirming that the unit has clean filters and an unobstructed supply and return vent are the final two methods appropriate for consumers to perform at home before contacting a professional repairman.