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Napoleon · Gas fireplace troubleshooting

Pilot goes out while standing (main burner OFF)

What is going on

Pilot drops out on its own while the main burner is off, often when another appliance or the burner fires - suspect undersized gas piping.

Likely causes

  • Gas supply piping undersized

Check in this order

  1. Turn on all gas appliances in the house and watch the pilot - fluttering, shrinking or going out (especially when the main burner lights) points to supply starvation.
  2. Monitor the appliance supply working pressure while everything runs (spec NG 7" w.c. min 4.5"; propane 13" w.c. min 11").
  3. Check supply pipe sizing against code and correct any undersized piping.

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

More gas fireplace guides

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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.