Before requesting service
Safe first steps and the information that helps a technician understand the problem.
What information should I have when I call?
Share the property address, the symptom, when it began, whether the system is running and the best number to reach you. Photos of visible equipment or water can also help with initial context.
What can I safely check before calling?
Check the thermostat setting and display, confirm the system switch is set correctly, look for a tripped accessible breaker and inspect the filter if it can be reached without opening equipment. Do not remove panels or work around exposed wiring.
When should I turn the HVAC system off?
Turn it off if you smell burning, see smoke, hear severe grinding, see water approaching electrical components or believe continued operation may cause damage. If there is an immediate safety risk, leave the area and contact the appropriate emergency service.
Should I replace the filter before service?
A visibly dirty filter can restrict airflow. Replace it with the correct size and type if you can do so safely, but keep the old filter or take a photo when its condition may help explain the problem.
