Furnace Not Heating With Pilot Light On

Tools That May Help

Before calling a professional, these common tools may help you check the issue safely.

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Problem

The pilot light is on but the furnace is not heating.

Common Symptoms

  • Weak airflow from vents
  • System running constantly
  • Uneven indoor temperatures
  • Higher energy bills

Possible Causes

  • Thermocouple issue
  • Gas flow problem
  • Control issue

How To Fix It

  • Check thermocouple
  • Verify gas flow
  • Inspect controls

Safety Tip

Always shut off power to the HVAC system before inspecting wiring or internal components.

When To Call A Professional

If pilot is on but heat is not produced

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