Furnace Blowing Cold Air 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 still blows cold air.

Common Symptoms

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

Possible Causes

  • Thermocouple issue
  • Gas flow problem
  • Control fault

How To Fix It

  • Check thermocouple
  • Verify gas supply
  • Inspect system

Safety Tip

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

When To Call A Professional

If heat is not produced despite pilot light

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