HTP Boiler: Lockout on ignition (F09, no flame)

Lockout on ignition (F09, no flame) on a HTP boiler: Boiler tries to light four times on one call and locks out.

Homeowner with a boiler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: EL-80, EL-110, EL-150, EL-220, EL-299, EL-399 (N/LP)

Common causes of lockout on ignition (f09, no flame)

• Spark electrode gap wrong or corroded
• No gas / low gas pressure / air in line
• Dirty flame rectifier
• Blocked flue or condensate

How to fix lockout on ignition (f09, no flame): step by step

1. Watch the igniter through the sight glass
2. Set electrode gap to 0.196 in. (5 mm +/-1) and clean corrosion
3. Measure gas inlet pressure; 3.5 to 14 in. w.c. with no more than 1 in. drop on light-off
4. New or empty LP installs: make sure the line was purged
5. Check the flame rectifier
6. Check flue and condensate for blockage

If the unit shows an error code, look it up: HTP Boiler codes

Models

EL-80 LPEL-80 NEL-110 LPEL-110 NEL-150 LPEL-150 NEL-220 LPEL-220 NEL-299 LPEL-299 NEL-399 LPEL-399 N