HVACopediaNapoleon · Gas fireplace troubleshooting
Main burner flame is blue, lazy and transparent
What is going on
Flame looks ghostly blue and see-through - a sign the burner is starved of combustion air / flue gases are recirculating.
Likely causes
- Blocked vent or terminal (including ice on the terminal in very cold weather)
- Incorrect vent installation - storm collars in the wrong place
Check in this order
- Warning: a ghostly blue flame means poor venting - shut the unit down until the vent is cleared.
- Inspect the vent and termination and remove any blockage.
- In very cold weather check for ice on the terminal and remove it as needed.
- Check storm collar location against the installation manual diagram (Figure 13) and correct it.
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.25. 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.