
Why Is My Heater Blowing Cold Air? Common Causes & Fixes
If you’re wondering why your heater is blowing cold air, the most common culprit is a thermostat set to “ON” instead of “AUTO.” When the fan runs continuously, it pushes unheated air between heating cycles. That’s an easy setting to check in seconds. However, cold air from your heater can also signal more urgent issues like a malfunctioning pilot light, a tripped limit switch, dirty flame sensors, or problems with













