Why Is My Furnace Not Heating? 8 Common Causes
When your furnace stops heating during a Denver winter, it's more than an inconvenience — it's an emergency. Here are the 8 most common reasons.
8 Common Causes
- Thermostat Issues — Check batteries and settings.
- Dirty Air Filter — Restricts airflow, causes overheating shutdown.
- Pilot Light or Ignitor Failure — Common and affordable repair.
- Gas Supply Issues — Check gas valve and other appliances.
- Blower Motor Problems — Can't push heated air through ducts.
- Heat Exchanger Cracks — Safety hazard (carbon monoxide risk).
- Flame Sensor Issues — Furnace ignites briefly then shuts down.
- Altitude-Related Issues — Denver's 5,280 ft affects combustion.
Call (720) 302-3513 for same-day furnace repair.