No Heat From Vents
medium prioritySome or all vents blow cold air when furnace is running
Understanding This Problem
Cold air from vents while your furnace runs suggests airflow or heat exchange problems. Uneven heating often indicates ductwork or zoning issues.
Common Causes
Blower running before heat is ready
Fan set to ON instead of AUTO
Duct leaks or disconnections
Closed or blocked dampers
Zone control issues
Heat exchanger problems
What You Can Do
Set fan to AUTO mode
Wait for system to complete startup
Check for disconnected ducts
Inspect visible dampers
Schedule duct inspection
Prevention Tips
- Understand normal system startup times
- Annual duct system inspection
- Balance airflow between zones
Medium Priority
Schedule service soon to prevent the problem from worsening.
Schedule ServiceCall (650) 555-HVAC24/7 Emergency Service Available
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