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Troubleshooting a Gas Furnace - Furnace Repair

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PROBLEM: Gas Furnace Produces No Heat

Gas Furnace Produces No Heat

Possible Causes

  • Thermostat set too low and not calling for heat
  • Thermostat not working
  • Circuit breaker or fuse controlling the furnace is tripped or blown
  • Natural gas or propane control valve is closed
  • Pilot light is out (non-electronic ignition)
  • Hot Surface Ignition electronic ignition problem
  • Intermittent Pilot electronic ignition problem

    Possible Repairs

  • Check that thermostat is in heat mode and has appropriate temperature setting
  • Try moving dial setting up or down a few degrees
  • Clean contacts in thermostat if it is a non-digital type
  • Reset tripped circuit breaker
  • Replace blown fuse
  • Relight standing pilot light
  • Troubleshoot hot surface ignition ignition
  • Troubleshoot intermittent pilot ignition system
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