Furnace Not Heating in 95404 (Santa Rosa, CA)
While Northern California winters are mild, nighttime temperatures can drop into the 30s. No heat is uncomfortable and can be dangerous for elderly residents and families with young children. A yellow pilot light or gas smell requires immediate attention.
A furnace not heating is commonly caused by a dirty filter, thermostat issues, a failed ignitor, or pilot light problems. Check your filter and thermostat first. If the pilot light is yellow (not blue), turn off the gas and call for service immediately due to carbon monoxide risk. Repairs typically cost $125–$500.
Common Causes in 95404
- •Dirty Air Filter — A clogged filter restricts airflow, causing the heat exchanger to overheat and trigger the high-limit safety switch. The blower runs but no heat is produced.
- •Failed Ignitor or Pilot Light — Electronic ignitors have a 5–7 year lifespan. A cracked ignitor won't light the burners. Older furnaces with standing pilot lights may have a blown-out or dirty pilot.
- •Thermostat Problems — Dead batteries, incorrect settings (set to COOL instead of HEAT), or a faulty temperature sensor can prevent the furnace from firing.
- •Gas Supply Issue — A closed gas valve, empty propane tank, or gas line problem prevents the burners from igniting. Check that the gas valve near the furnace is in the ON position.
- •Flame Sensor Dirty — The flame sensor verifies that the burners are lit. A dirty sensor can't detect the flame, causing the gas valve to shut off after a few seconds of operation.
- •Blower Motor Failure — If the blower motor fails, the furnace may fire but cannot circulate warm air through the ducts. You'll feel heat near the furnace but not at vents.
When to Call a Pro in Santa Rosa
- ✓ You smell gas near the furnace (leave the house and call your utility first)
- ✓ The pilot light is yellow or flickering instead of blue
- ✓ The furnace starts but shuts off after a few seconds repeatedly
- ✓ You've replaced the filter and checked the thermostat with no improvement
- ✓ There's no heat and nighttime temperatures are below 40°F