The boiler tried to ignite four times during one heat call and failed. This is a serious safety issue as indicated by the illuminated red light and the word LOCKOUT flashing on the display. The boiler will not restart until a technician determines and repairs the cause of ignition failure and pushes RESET on the display. During this lockout fault, the pump will remain on.
- Watch the igniter through the observation window.
- If there is no spark, check the spark electrode for the proper .196” (5.0 mm ± 1mm) gap.
- Remove any corrosion from the spark electrode and flame rectifier probe.
- If there is a spark but no flame, check the gas supply to the boiler.
- If there is a flame, check the flame sensor.
- Check any flue blockage or condensate blocks.
