Napoleon Gas Fireplace: Delayed ignition of main burner
Delayed ignition of main burner on a Napoleon gas fireplace: Main burner lights late or with a roll-out/puff.
Applies to: Napoleon gas fireplaces - direct vent, natural vent and vent-free (general service manual)
Common causes of delayed ignition of main burner
- Pilot too small/mispositioned
- Low supply pressure
- Blocked or wrong-size burner orifice
- Venturi (air shutter) out of adjustment
- Venturi access door leaking (direct vent)
- Burner not level
- Logs out of place
- Embers clogging ports
- Vent or door seal leaks (direct vent)
How to fix delayed ignition of main burner: step by step
- WARNING: delayed ignition can be hazardous - correct before returning to service.
- Check pilot size and position so it reaches the ignition ports.
- Test inline supply pressure.
- Check burner and orifice for blockage and confirm orifice size is to spec.
- Check and adjust the venturi/air shutter to improve ignition time.
- Direct vent: make sure the venturi access door is tightly sealed and its gasket intact.
- Level the burner (direct vent / vent-free).
- Check log position and make sure charcoal/glowing embers are not clogging the ports.
- Direct vent: check vent seals and the main door seal for air leaks.
If the unit shows an error code, look it up: Napoleon Gas Fireplace codes
Models
Source: Napoleon (Wolf Steel) Service Manual W415-0118, Part 1-3 Troubleshooting, Main Burner Delayed Ignition Flowcharts, p.5 / p.14 / p.23. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.