Your furnace is an investment made to keep your indoor environment warm. Sometimes, this system may fail to work. This unreliability is not only frustrating but also a source of worry. Why won’t your furnace start?

1. Thermostat Issues

The thermostat dictates when the furnace goes on or off. A faulty thermostat will have incorrect readings, which prevent the furnace from starting. A dead thermostat battery can also cause this problem.

2. Lack of Power

Check whether the furnace is receiving power. A tripped circuit breaker, faulty wiring, or broken fuse will cause power loss to the furnace. A power outage may also be the cause.

3. Ignition Problems

If you have a gas furnace, a faulty ignition system will prevent the furnace from working. The pilot light is the steady flame that lights up the fuel. The thermocouple detects this flame and allows the gas valve to open and release the fuel. If one fails to work, the furnace fails to start.

4. Dirty or Clogged Filters

Dirt in the air filters restricts airflow. The furnace will overheat, and the safety mechanism will shut it down. It may also start a cycle of turning on and off irregularly. Regular cleaning and replacement of air filters solve this problem.

5. Limit Switch Issues

The limit switch is a safety device that turns the furnace off when it gets too hot. The heating unit can overheat due to airflow limitation or excess workload. A malfunctioning limit switch can cause the furnace to shut off prematurely or fail to turn on.

6. Gas Supply Problem

Gas furnaces depend on a steady supply of fuel. A blocked gas line or valve misalignment will restrict the flow of fuel. Inadequate gas pressure will also affect the furnace’s ability to ignite and maintain a flame. An outdoor gas regulator may freeze in extremely low temperatures and affect gas flow.

When your furnace fails to work, contact a reliable HVAC technician to inspect your system and determine the cause. At Airvengers, LLC, we offer heating and air conditioning services in Oakdale, CA. Our NATE-certified technicians ensure clients keep energy bills down and equipment life longer. We offer furnace, heat pump, and central air conditioning services. Contact Airvengers, LLC today and enjoy our 24-hour services.

Meet the Author
Airvengers Team
Airvengers Team

Airvengers LLC has over 15 years of serving the Central Valley and surrounding areas. We are a small, family-owned business looking to serve the local community with any of your indoor, heating, and air conditioning needs.
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