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Napoleon · Gas fireplace troubleshooting

Pilot lit, no gas to main burner (knob on HI, switch/thermostat ON)

What is going on

Pilot is burning and controls are calling but the main burner will not come on.

Likely causes

  • Defective thermostat or wall switch
  • Defective switch wiring
  • Plugged main burner orifice
  • Faulty valve

Check in this order

  1. Jumper across the wall switch terminals - if the burner lights, replace the switch/thermostat.
  2. Disconnect the switch wires at the valve and jumper valve terminals 1 & 3 - if the burner lights, the field wires are bad; repair or replace them.
  3. If the burner still does not light with the jumper, check and clear the main burner orifice.
  4. If the orifice is clear, replace the gas valve.

Applies to: Napoleon GD70 STARfire direct-vent fireplace (GD70NT-S natural gas, GD70PT-S propane)

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Source: Napoleon GD70NT-S / GD70PT-S Installation & Operating Instructions W415-0434, Troubleshooting table, p.26. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.