What can I do before calling someone to service my system?
Professional service calls can be costly, but there are some things you can do before hiring a professional to inspect your system:
Disconnect your indoor and outdoor switches.
Make sure your circuit breakers are in the ON position.
Make sure your filters are clean.
Open supply and return vents and make sure they are unobstructed.
Double check both indoor and outdoor disconnect switches.
Check the settings on your thermostat.
Make sure the system switch is on the appropriate COOL or HEAT setting.
Have the FAN switch on for a continuous vent.