What Are Common Reasons My Heater Is Not Working in My House?

Most heater failures come from a few issues. Dirty or clogged filters restrict airflow and cause shutdowns. Faulty ignition or burners stop firing. A mis-set or failing thermostat blocks heat calls. Tripped safety controls or loose electrical connections cut power. Blower motor or belt issues limit airflow. Cracked heat exchangers or gas leaks trigger safety lockouts. In Los Angeles homes, tune-ups catch these early.

• Set thermostat to Heat and 3–5°F higher.
• Replace the air filter.
• Check the furnace switch and breaker.

Updated: 2025-12-19

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